LEGUMINOSAE (PULSE FAMILY) 511 



21. ANTHtLLIS [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. VULNER\RIA L. Pubescent, 2-3 dm. high; leaflets mostly 5-18 (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 

 porta. (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 1-8-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., HI. (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. coRNicuiATus L. Diffuse many-stemmed perennial ; flowers yellow in 

 slender-peduncled capitate umbels. Dry meadows, Washington, D. C. (PecA), 

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



24. PSORA1EA 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, ^wpaX^os, 

 scurfy, from the glands or dots.) 



* Leaves pinnately 3-foliolate. 



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

 high ; leaflets lanceolate-ovate, taper-pointed, 7-8 mm. long ; stipules and 

 bracts awl-shaped ; racemes elongated ; peduncles shorter than the leaves ; 

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

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



2. P. stipulata 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. pedunculata (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-shaped ; bracts ovate or lanceo- 

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



