Part 17

Pod sessile or shortly stipitate in the calyx, flat, linear, straight or curved. Otherwise nearly as Baptisia.--Perennial herbs, with palmately 3-foliolate leaves and foliaceous stipules, not blackening in drying, and yellow flowers in terminal racemes. (Name from [Greek: the/rmos], _the lupine_, and [Greek: o)/psis] _resemblance_.)

1. T. mollis, M. A. Curtis. Finely appressed-pubescent, 2--3 deg. high; leaflets rhombic-lanceolate, 1--3' long; stipules narrow, mostly shorter than the petiole; raceme elongated; pods narrow, short stipitate, somewhat curved, 2--4' long.--Mountains of S. Va. and N. C.

2. T. rhombifolia, Nutt. Low, with smaller leaves and broad conspicuous stipules; racemes short, few-flowered; pods broadly linear, spreading, usually strongly curved.--Sask. to E. Col., near or in the mountains, reported from central Kan.

3. CLADRASTIS, Raf. YELLOW-WOOD.

Calyx 5-toothed. Standard large, roundish, reflexed; the distinct keel-petals and wings straight, oblong. Stamens 10, distinct; filaments slender, incurved above. Pod short-stalked above the calyx, linear, flat, thin, marginless, 4--6-seeded, at length 2-valved.--A handsome tree, with yellow wood, smooth bark, nearly smooth pinnate leaves of 7--11 oval or ovate leaflets, and ample panicled racemes (10--20' long) of showy white flowers drooping from the ends of the branches. Stipules obsolete. Base of the petioles hollow, enclosing the leaf buds of the next year. Bracts minute and fugacious. (Name from [Greek: kla/dos], _a branch_, and [Greek: thraysto/s], _brittle_.)

1. C. tinctoria, Raf. Sometimes 50 deg. high; pods 3--4' long.--Rich hillsides, central Ky. and Tenn. to N. C. Also in cultivation. The wood yields a yellow dye.

4. SOPHORA, L.

Calyx bell-shaped, shortly 5-toothed. Standard rounded; keel nearly straight. Stamens distinct or nearly so. Pod coriaceous, stipitate, terete, more or less constricted between the seeds, indehiscent. Seeds subglobose.--Shrubby or ours an herbaceous perennial, the leaves pinnate with numerous leaflets, and flowers white or yellow in terminal racemes. (Said by Linnaeus to be the ancient name of an allied plant.)

1. S. sericea, Nutt. Silky canescent, erect, 1 deg. high or less; leaflets oblong-obovate, 3--6'' long; flowers white; pods few-seeded.--Central Kan. to Col., Tex., and Ariz.

5. CROTALARIA, L. RATTLE-BOX.

Calyx 5-cleft, scarcely 2-lipped. Standard large, heart-shaped; keel scythe-shaped. Sheath of the monadelphous stamens cleft on the upper side; 5 of the anthers smaller and roundish. Pod inflated, oblong, many-seeded.--Herbs with simple leaves. Flowers yellow. (Name from [Greek: kro/talon], _a rattle_; the loose seeds rattling in the coriaceous inflated pods.)

1. C. sagittalis, L. Annual, hairy (3--6' high); leaves oval or oblong-lanceolate, scarcely petioled, stipules united and decurrent on the stem, so as to be inversely arrow-shaped; peduncles few-flowered; corolla not longer than the calyx; pod blackish.--Sandy soil; Maine to Ill., Minn., Kan., and southward.

6. GENISTA, L. WOAD-WAXEN. WHIN.

Calyx 2-lipped. Standard oblong-oval, spreading; keel oblong, straight, deflexed. Stamens monadelphous, the sheath entire; 5 alternate anthers shorter. Pod mostly flat and several-seeded.--Shrubby plants, with simple leaves, and yellow flowers. (Name from the Celtic _gen_, a bush.)

G. TINCTORIA, L. (DYER'S GREEN-WEED.) Low, not thorny, with striate-angled erect branches; leaves lanceolate; flowers in spiked racemes.--Established on sterile hills, eastern N. Y. and Mass. (Adv. from Eu.)

7. CYTISUS, Tourn. BROOM.

Calyx campanulate, with 2 short broad lips. Petals broad, the keel obtuse and slightly incurved. Stamens monadelphous. Pod flat, much longer than the calyx. Seeds several, with a strophiole at the hilum.--Shrubs, with stiff green branches, leaves mostly digitately 3-foliolate, and large bright yellow flowers. (The ancient Roman name of a plant, probably a Medicago.)

C. SCOPARIUS, Link. (SCOTCH BROOM.) Glabrous or nearly so (3--5 deg. high); leaflets small, obovate, often reduced to a single one; flowers solitary or in pairs, on slender pedicels, in the axils of the old leaves, forming leafy racemes along the upper branches; style very long and spirally incurved.--Va. and southward. (Nat. from Eu.)

8. LUPINUS, Tourn. LUPINE.

Calyx very deeply 2-lipped. Sides of the standard reflexed; keel scythe-shaped, pointed. Sheath of the monadelphous stamens entire; anthers alternately oblong and roundish. Pod oblong, flattened, often knotty by constrictions between the seeds. Cotyledons thick and fleshy.--Herbs, with palmately 1--15-foliolate leaves, stipules adnate to base of the petiole, and showy flowers in terminal racemes or spikes. (Name from _Lupus_, a wolf, because these plants were thought to devour the fertility of the soil.)

1. L. perennis, L. (WILD LUPINE.) Perennial, somewhat hairy; stem erect (1--2 deg.); leaflets 7--11, oblanceolate; flowers in a long raceme, showy, purplish-blue (rarely pale); pods broad, very hairy, 5--6-seeded.--Sandy soil, N. Eng. to Minn., Mo., and south to the Gulf.--Var. OCCIDENTALIS, Watson, has stems and petioles more villous.--Mich. and Wisc.

2. L. pusillus, Pursh. Annual, low, villous; leaflets usually 5; racemes short, sessile; flowers purple or rose-color; pods oval, hirsute, 2-seeded.--Central Dak. and Kan., and westward.

9. TRIFOLIUM, Tourn. CLOVER. TREFOIL.

Calyx persistent, 5-cleft, the teeth bristle-form. Corolla mostly withering or persistent; the claws of all the petals, or of all except the oblong or ovate standard, more or less united below with the stamen-tube; keel short and obtuse. Tenth stamen more or less separate. Pods small and membranous, often included in the calyx, 1--6-seeded, indehiscent, or opening by one of the sutures.--Tufted or diffuse herbs. Leaves mostly palmately, sometimes pinnately 3-foliolate; leaflets usually toothed. Stipules united with the petiole. Flowers in heads or spikes. (Name from _tres_, three, and _folium_, a leaf.)

[*] _Flowers sessile in dense heads; corolla purple or purplish, withering away after flowering, tubular below, the petals more or less coherent with each other._

[+] _Calyx-teeth silky-plumose, longer than the whitish corolla; root annual._

T. ARVENSE, L. (RABBIT-FOOT or STONE CLOVER.) Silky, branching (5--10' high); leaflets oblanceolate; heads becoming very soft-silky and grayish, oblong or cylindrical.--Old fields, etc. (Nat. from Eu.)

[+][+] _Calyx scarcely hairy except a bearded ring in the throat, shorter than the rose-purple elongated-tubular corolla. (Short-lived perennials; flowers sweet-scented.)_

T. PRATENSE, L. (RED C.) Stems ascending, somewhat hairy; _leaflets oval or obovate, often notched_ at the end and marked on the upper side with a pale spot; _stipules broad, bristle-pointed; heads ovate, sessile_.--Fields and meadows; largely cultivated. (Adv. from Eu.)

T. MEDIUM, L. (ZIGZAG C.) Stems zigzag, smoothish; _leaflets oblong, entire_, and spotless; _heads mostly stalked_; flowers deeper purple, otherwise too like the last.--Dry hills, N. Scotia to E. Mass. (Adv. from Eu.)

[*][*] _Flowers pedicelled in umbel-like round heads on a naked peduncle, their short pedicels reflexed when old; corolla white or rose-color, withering-persistent and turning brownish in fading; the tubular portion short._

1. T. reflexum, L. (BUFFALO C.) Annual or biennial; _stems ascending, downy; leaflets obovate-oblong_, finely toothed; stipules thin, ovate; standard rose-red, wings and keel whitish; calyx-teeth hairy; pods 3--5-seeded.--Western N. Y. and Ont. to Iowa, Kan., and southward.

2. T. stoloniferum, Muhl. (RUNNING BUFFALO-C.) Smooth, _perennial; stems with long runners_ from the base; _leaflets broadly obovate or obcordate_, minutely toothed; heads loose; flowers white, tinged with purple; pods 2-seeded.--Open woodlands and prairies, Ohio and Ky., west to Iowa and Kan.

3. T. repens, L. (WHITE C.) Smooth, perennial; the slender _stems spreading and creeping; leaflets inversely heart-shaped_ or merely notched, obscurely toothed; stipules scale-like, narrow; petioles and especially the peduncles very long; heads small and loose; _calyx much shorter than the white corolla_; pods about 4-seeded.--Fields and copses, everywhere. Indigenous only in the northern part of our range, if at all.

4. T. Carolinianum, Michx. Somewhat pubescent small perennial, _procumbent, in tufts_; leaflets wedge-obovate and slightly notched; stipules ovate, foliaceous; heads small on slender peduncles; _calyx-teeth_ lanceolate, nearly _equalling the purplish corolla; standard pointed_; pods 4-seeded.--Waste ground near Philadelphia, south to Va., Fla., and Tex.

T. HYBRIDUM, L. (ALSIKE C.) Resembling T. repens, but the stems erect or ascending, not rooting at the nodes; flowers rose-tinted.--Becoming common. (Nat. from Eu.)

[*][*][*] _Flowers short-pedicelled in close heads, reflexed when old; corolla yellow, persistent, turning dry and chestnut-brown with age, the standard becoming hood-shaped; annuals, fl. in summer._

T. AGRARIUM, L. (YELLOW or HOP-C.) Smoothish, somewhat upright (6--12' high); _leaflets obovate-oblong, all three from the same point_ (palmate) and nearly sessile; _stipules narrow, cohering with the petiole for more than half its length_.--Sandy fields and roadsides; N. Scotia to Va.; also in western N. Y. (Nat. from Eu.)

T. PROCUMBENS, L. (LOW HOP-C.) Stems spreading or ascending, pubescent (3--6' high); _leaflets wedge-obovate_, notched at the end, _the lateral at a small distance from the other_ (pinnately 3-foliolate); _stipules ovate, short_.--Sandy fields and roadsides, common.--Var. MINUS, Gray, has smaller heads, the standard not much striate with age. (Nat. from Eu.)

10. MELILOTUS, Tourn. MELILOT. SWEET CLOVER.

Flowers much as in Trifolium, but in spike-like racemes, small; corolla deciduous, free from the stamen-tube. Pod ovoid, coriaceous, wrinkled, longer than the calyx, scarcely dehiscent, 1--2-seeded.--Annual or biennial herbs, fragrant in drying, with pinnately 3-foliolate leaves, leaflets toothed. (Name from [Greek: me/li], _honey_, and [Greek: loto/s], some leguminous plant.)

M. OFFICINALIS, Willd. (YELLOW MELILOT.) Upright (2--4 deg. high); leaflets obovate-oblong, obtuse; _corolla yellow_; the petals nearly of equal length.--Waste or cultivated grounds. (Adv. from Eu.)

M. ALBA, Lam. (WHITE M.) Leaflets truncate; _corolla white_; the standard longer than the other petals.--In similar places. (Adv. from Eu.)

11. MEDICAGO, Tourn. MEDICK.

Flowers nearly as in Melilotus. Pod 1--several-seeded, scythe-shaped, incurved, or variously coiled.--Leaves pinnately 3-foliolate; leaflets toothed; stipules often cut. ([Greek: Medike/], the name of Lucerne, because it came to the Greeks from Media.)

M. SATIVA, L. (LUCERNE. ALFALFA.) Upright, smooth, perennial; leaflets obovate-oblong, toothed; _flowers (purple) racemed_; pods spirally twisted.--Cultivated for green fodder; spontaneous from Mass. to Minn. and Kan. (Adv. from Eu.)

M. LUPULINA, L. (BLACK MEDICK. NONESUCH.) Procumbent, pubescent, annual; leaflets wedge-obovate, toothed at the apex; _flowers in short spikes_ (yellow); _pods kidney-form_, 1-seeded.--Waste places, N. Eng. to Fla., west to Mich., Iowa, and Mo. (Adv. from Eu.)

M. MACULATA, Willd. (SPOTTED MEDICK.) Spreading or procumbent annual, somewhat pubescent; leaflets obcordate, with a purple spot, minutely toothed; _peduncles 3--5-flowered_; flowers yellow; _pods compactly spiral_, of 2 or 3 turns, compressed, _furrowed on the thick edge_, and fringed with a double row of curved prickles.--N. Brunswick to Mass. (Adv. from Eu.)

M. DENTICULATA, Willd. Nearly glabrous; _pods loosely spiral, deeply reticulated_, and with a _thin keeled edge_; otherwise like the last, and with the same range. (Adv. from Eu.)

12. HOSACKIA, Douglas.

Calyx-teeth nearly equal. Petals free from the diadelphous stamens; standard ovate or roundish, its claw often remote from the others; wings obovate or oblong; keel incurved. Pod linear, compressed or somewhat terete, sessile, several-seeded.--Herbs, with pinnate leaves (in ours 1--3-foliolate, with gland-like stipules), and small yellow or reddish flowers in umbels (ours solitary) upon axillary leafy-bracteate peduncles. (Named for _Dr. David Hosack_, of New York.)

1. H. Purshiana, Benth. Annual, more or less silky-villous or glabrous, often 1 deg. high or more; leaves nearly sessile, the 1--3 leaflets ovate to lanceolate (3--9'' long); peduncles often short, bracteate with a single leaflet.--N. C.; S. W. Minn. to Ark., and west to the Pacific. Very variable.

13. PSORALEA, L.

Calyx 5-cleft, persistent, the lower lobe longest. Stamens diadelphous or sometimes monadelphous. Pod seldom longer than the calyx, thick, often wrinkled, indehiscent, 1-seeded.--Perennial herbs, usually sprinkled all over or roughened (especially the calyx, pods, etc.) with glandular dots or points. Leaves mostly 3--5-foliolate. Flowers spiked or racemed, white or mostly blue-purplish. Root sometimes tuberous and farinaceous. (Name, [Greek: psorale/os], _scurfy_, from the glands or dots.)

[*] _Leaves pinnately 3-foliolate._

1. P. Onobrychis, Nutt. Nearly smooth and free from glands, _erect_ (3--5 deg. high); _leaflets lanceolate-ovate, taper-pointed_ (3' long); _stipules and bracts awl-shaped_; racemes elongated; peduncle shorter than the leaves; pods roughened and wrinkled.--River-banks, Ohio to Ill. and Mo.; also south and east to S. C. July.

2. P. stipulata, Torr. & Gray. Nearly smooth and glandless; _stems diffuse; leaflets ovate-elliptical_, reticulated; _stipules ovate; flowers in heads_ on rather short peduncles; _bracts broadly ovate, sharp-pointed_.--Rocks, S. Ind. and Ky. June, July.

3. P. melilotoides, Michx. Somewhat pubescent, more or less glandular; _stems erect_ (1--2 deg. high), slender; _leaflets lanceolate or narrowly oblong; spikes oblong_, long-peduncled; _stipules awl-shaped_; bracts ovate or lanceolate, taper-pointed; pods strongly wrinkled transversely.--Dry soil, Fla. to Tenn., S. Ind. and Kan. June.

[*][*] _Leaves palmately 3--5-foliolate; roots not tuberous._

4. P. tenuiflora, Pursh. Slender, erect, much branched and bushy (2--4 deg. high), _minutely hoary-pubescent_ when young; leaflets varying from linear to obovate-oblong (1/2--11/2' long), glandular-dotted; _flowers_ (2--3'' long) _in loose racemes_; lobes of the calyx and bracts ovate, acute; pod glandular. (P. floribunda, _Nutt._)--Prairies, Minn. to Ill., Tex., and westward. June--Sept.

5. P. argophylla, Pursh. _Silvery silky-white_ all over, erect, divergently branched (1--3 deg. high); leaflets _elliptical-lanceolate; spikes interrupted_; lobes of the calyx and _bracts lanceolate_.--High plains, N. Wisc. to Iowa, Kan., and westward. June.--Flowers 4--5'' long.

6. P. digitata, Nutt. More slender and less hoary, 1--2 deg. high; leaflets linear-oblanceolate; bracts of the interrupted spike obcordate; calyx-lobes oblong, acute.--Central Kan. to Col. and Tex.

7. P. lanceolata, Pursh. Glabrous or nearly so, yellowish green, densely punctate; leaflets 3, linear to oblanceolate; flowers small, in very short spikes; calyx 1'' long, with short broad teeth.--Central Kan. to the Sask. and westward.

[*][*][*] _Leaves palmately 5-foliolate; root tuberous; spike-like racemes dense._

8. P. esculenta, Pursh. Roughish hairy all over; stem stout (5--15' high) and erect from a tuberous or turnip-shaped farinaceous root; leaflets obovate- or lanceolate-oblong; spikes oblong, long-peduncled; lobes of the calyx and bracts lanceolate, nearly equalling the corolla (1/2' long).--High plains, Sask. to Wisc., Iowa, and Tex. June. The POMME BLANCHE, or POMME DE PRAIRIE, of the voyageurs.

9. P. hypogaea, Nutt. Tuber small; nearly acaulescent, hoary with appressed hairs; leaflets linear; spikes short-capitate, on peduncles 1/2--2' long; calyx narrow, 3--6'' long.--Central Kan. to Col. and Tex.

10. P. cuspidata, Pursh. Stout, tall, from a deep-seated tuber, hoary with appressed hairs; leaflets usually broadly oblanceolate, obtuse; flowers large, the petals (6--8'' long) exceeding the lanceolate-lobed calyx.--Central Kan. to Col. and Tex.

14. AMORPHA, L. FALSE INDIGO.

Calyx inversely conical, 5-toothed, persistent. Standard (the other petals entirely wanting!) wrapped around the stamens and style. Stamens 10, monadelphous at the very base, otherwise distinct. Pod oblong, longer than the calyx, 1--2-seeded, roughened, tardily dehiscent.--Shrubs, with odd-pinnate leaves; the leaflets marked with minute dots, usually stipellate, the midvein excurrent. Flowers violet or purple, crowded in clustered terminal spikes. (Name, [Greek: a)/morphos], _deformed_, from the absence of four of the petals.)

[*] _Pods 1-seeded; leaflets small_ (1/2' long or less), _crowded_.

1. A. canescens, Nutt. (LEAD-PLANT.) _Whitened with hoary down_ (1--3 deg. high); leaflets 15--25 pairs, oblong-elliptical, becoming smoothish above; spikes usually clustered at the summit.--Sask. to Ind. and Tex., west to the Rocky Mts.; also eastward to Ga.

2. A. microphylla, Pursh. _Nearly glabrous_ throughout, 1 deg. high or less; leaflets rather rigid; spikes usually solitary.--Sask. to Minn. and Iowa, west to the Rocky Mts.

[*][*] _Pods 2-seeded; leaflets larger, scattered._

3. A. fruticosa, L. (FALSE INDIGO.) A tall shrub, rather pubescent or smoothish, leaflets 8--12 pairs, oblong to broadly elliptical.--River-banks, S. Penn. to Fla., west to Sask., Tex., and the Rocky Mts. Very variable.

15. DALEA, L.

Calyx 5-cleft or toothed. Corolla imperfectly papilionaceous; petals all on claws; the standard heart-shaped, inserted in the bottom of the calyx; the keel and wings borne on the middle of the monadelphous sheath of filaments, which is cleft down one side. Stamens 10, rarely 9. Pod membranaceous, 1-seeded, indehiscent, enclosed in the persistent calyx.--Mostly herbs, more or less glandular-dotted, with minute stipules; the small flowers in terminal spikes or heads. (Named for _Samuel Dale_, an English botanist.)

[*] _Glabrous; flowers white or rose-color; leaflets 4--20 pairs; annuals._

1. D. alopecuroides, Willd. Erect (1--2 deg. high); leaflets 10--20 pairs, linear-oblong; flowers light rose-color or whitish, in cylindrical spikes; bracts ovate-lanceolate, acuminate, deciduous; calyx very villous, with long slender teeth.--Alluvial soil, Minn. to Ill. and Ala., west to the Rocky Mts.

2. D. laxiflora, Pursh. Erect (1--4 deg. high), branching; leaflets 3--5 pairs, linear, 2--3'' long; spikes loosely-flowered; bracts conspicuous, persistent, almost orbicular and very obtuse; petals white; calyx densely villous, the long teeth beautifully plumose.--Iowa and Mo. to Tex., west to Col.

[*][*] _Pubescent; leaflets 3--4 pairs; perennial herbs._

3. D. aurea, Nutt. Stems erect and simple, 1--3 deg. high; leaflets oblong-obovate to linear-oblong, more or less silky-pubescent; spikes solitary, oblong-ovate, very compact and densely silky; bracts short, rhombic-ovate; petals yellow.--On the plains, Mo. to Tex., and westward.

4. D. lanata, Spreng. Very pubescent throughout, 1--2 deg. high, branching; leaflets obovate to oblong-obovate, 2--3'' long; spikes slender, rather loose, the obovate acute bracts equalling the small short-toothed calyx; petals short, purple.--Central Kan. to Tex., and westward.

16. PETALOSTEMON, Michx. PRAIRIE CLOVER.

Calyx 5-toothed. Corolla indistinctly papilionaceous; petals all on thread-shaped claws, 4 of them nearly similar and spreading, borne on the top of the monadelphous and cleft sheath of filaments, alternate with the 5 anthers; the fifth (standard) inserted in the bottom of the calyx, heart-shaped or oblong. Pod membranaceous, enclosed in the calyx, indehiscent, 1--2 seeded.--Chiefly perennial herbs, upright, glandular-dotted, with crowded odd-pinnate leaves, minute stipules, and small flowers in very dense terminal and peduncled heads or spikes. (Name combined of the two Greek words for petal and stamen, alluding to the peculiar union of these organs in this genus.)

1. P. violaceus, Michx. _Smoothish; leaflets 5, narrowly linear; heads globose-ovate_, or oblong-cylindrical when old; bracts pointed, not longer than the silky-hoary calyx; _corolla rose-purple_.--Dry prairies, Minn. to Ind. and Tex., west to the Rocky Mts. July.

2. P. candidus, Michx. _Smooth; leaflets 7--9, lanceolate or linear-oblong; heads oblong_, when old cylindrical; bracts awned, longer than the nearly glabrous calyx; _corolla white_.--With n. 1.

3. P. villosus, Nutt. _Soft-downy or silky_ all over; _leaflets 13--17, linear or oblong_, small (4--5'' long); _spikes cylindrical_ (1--5' long), short-peduncled, soft-villous; _corolla rose-color_.--Wisc. to Mo., west to the Rocky Mts.

4. P. foliosus, Gray. _Smooth_, very leafy; _leaflets 15--29, linear-oblong; spikes cylindrical_, short-peduncled; bracts slender-awned from a lanceolate base, exceeding the glabrous calyx; _petals rose-color_.--River-banks, Ill. and Tenn.

5. P. multiflorus, Nutt. _Glabrous_ throughout, erect, branching; leaflets 3--9, linear to oblong; _spikes globose_, the subulate setaceous bracts much shorter than the acutely toothed calyx, petals white.--Kan. to Tex.

17. TEPHROSIA, Pers. HOARY PEA.

Calyx about equally 5-cleft. Standard roundish, usually silky outside, turned back, scarcely longer than the coherent wings and keel. Stamens monadelphous or diadelphous. Pod linear, flat, several seeded, 2-valved.--Hoary perennial herbs, with odd-pinnate leaves, and white or purplish racemed flowers. Leaflets mucronate, veiny. (Name from [Greek: tephro/s], _ash-colored_ or _hoary_.)

1. T. Virginiana, Pers. (GOAT'S RUE. CATGUT.) _Silky-villous_ with whitish hairs when young; _stem erect and simple_ (1--2 deg. high), _leafy_ to the top; leaflets 17--29, linear-oblong; flowers large and numerous, clustered in a terminal _oblong dense raceme or panicle_, yellowish-white marked with purple.--Dry sandy soil. June, July.--Roots long and slender, very tough.

2. T. spicata, Torr. & Gray. _Villous with rusty hairs_; stems branched below, straggling or ascending (2 deg. long), _few-leaved_; leaflets 9--15, obovate or oblong-wedge-shaped, often notched; _flowers few_, in a loose and interrupted _very long-peduncled spike_, reddish.--Dry soil, from Del. and Va. to Fla. and Miss. July.

3. T. hispidula, Pers. Hairy with some long and rusty or only minute and appressed pubescence; stems slender (9--24' long), divergently branched, straggling; leaflets 5--15, oblong, varying to obovate-wedge-shaped and oblanceolate; _peduncles longer than the leaves, 2--4-flowered_, flowers reddish-purple.--Dry sandy soil, Va. to Fla. and Ala.

18. INDIGOFERA, L. INDIGO.

Calyx small, equally 5-cleft. Standard roundish, silky outside, wings coherent; keel erect, gibbous or spurred at base. Stamens diadelphous; connective gland-like. Pod 1--several-seeded, septate within between the seeds.--Herbs or shrubs, mostly canescent with appressed hairs fixed by the middle, with odd-pinnate faintly-nerved leaves, and pink or purplish flowers in naked axillary spikes. (So named because some of the species yield the indigo of commerce.)

1. I. leptosepala, Nutt. A perennial herb, 1/2--2 deg. high; leaflets 5--9, oblanceolate; spikes very loose; pods linear, 6--9 seeded, obtusely 4-angled, reflexed, 1' long.--Kan. to Tex. and Fla.

19. ROBINIA, L. LOCUST-TREE.