LEGUMINOSAE (PULSE FAMILY) 511 



21. ANTHYLLIS [Rivinius] L. 



Calyx 5-toothed, loose, persistent and somewhat vesicular in age. Corolla 

 yellow to crimson. Keel blunt or short-pointed. Pod mostly stalked* included 

 in the calyx, nearly or quite indehiscent, 2-several-seeded. — Herbs, with 

 pinnate leaves and large loose clover-like heads. (An ancient plant-name 

 employed by Dioscorides.) 



1. A. VulnerAria L. Pubescent, 2-3 dm. high; leaflets mostly 5-13 (on 

 the basal leaves often fewer and sometimes reduced to a solitary enlarged 

 terminal leaflet); heads ovoid or subglobose, involucrate. — In clover fields 

 Oxford Co., Out. (Burgess); also occasional as a ballast plant about Atlantic 

 ports. (Adv. from Eu.) 



22. HOSACKIA Dougl. 



Calyx-teeth nearly equal. Petals free from the diadelphous stamens ; stand- 

 ard 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, 1769- 

 1835, professor of botany and materia medica in Columbia College.) 



1. H. americana (Nutt.) Piper. Annual, more or less silky-villous or sub- 

 glabrous, often 3 dm. high or more ; leaves nearly sessile, the 1-3 leaflets ovate 

 to lanceolate (0.6-1.8 cm. long); peduncles often short, bracteate with a single 

 leaflet. {Lotus Bischoff; H. Purshiana Benth.) — Dry soil, w. Minn, to Ark., 

 and westw. ; also introduced in Greene Co., 111. (according to McDonald). 



23. l6tUS [Tourn.] L. Bird's-foot Trefoil 



Similar to the preceding genus but with pinnately 5-foliolate leaves, the 

 basal pair of leaflets simulating stipules. (Ancient Greek plant-name.) 



L. corniculXtds L. Diffuse many-stemmed perennial ; flowers yellow in 

 slender-peduncled capitate umbels. — Dry meadows, Washington, D. C. {Peek), 

 and on ballast, etc., to N. S. (Adv. from Old World.) 



24. 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, \//upa\^os, 

 scurfy, from the glands or dots.) 



* Leaves pinnately S-foUolate. 



1. P. On6brychis Nutt. Nearly smooth and free from glands, erect, 1-2 m. 

 high; leaflets lanceolate-ovate, taper-pointed, 7-8 mm. long; stipziles ajid 

 bracts aid -shaped ; racemes elongated; peduncles shorter than tlie leaves; 

 pods roughened and wrinkled. — River-banks and deciduous woods, O. to 111. 

 and Mo.; also s. and e. to S. C. 



2. P. stipuUta T. & G. Nearly smooth and glandless- ; stems diffuse ; leaflets 

 ovate- elliptical, reticulated; stipules ovate; flowers in heads on rather short 

 peduncles; bracts broadly ovate, sharp-pointed. — Limestone ledges, Ohio R. 

 above Louisville, Ky., and New Albany, Ind. ; very local. June. 



3. P. peduncuUta (Mill.) Vail. Somewhat pubescent, more or less glandu- 

 lar; stems erect, 3-6 dm. high, slender; leaflets lanceolate or narrowly oblong; 

 spike cylindrical, long-peduncled ; stipules awl-shnped ; bracts ovate or lanceo- 

 late, taper-pointed ; pods strongly wrinkled transversely. (P. melilotoides 



