512 LEGUMINOSAE (PULSE EAMILY) 



jVlichx.) — Dry soil, Fla. to Tenn., Sandusky, (). (Moseley), s, Ind., and Kaa 

 June. 



* * Leaves palmately 3-o-foliolate ; roots not tuberous. 



-t- Fruit more or less compressed, ovate. 



4. P. tenuifl5ra Pursh. Slender, erect, much branched and bushy, 6-12 

 dm. high, minutely hoary-pubescent when young ; leaflets varying from lineal" 

 to obovate-oblong, 1.2-3.0 cm. long, glandular-dotted ; flowers (4-6 mm. long) 

 in loose racemes ; lobes of the calyx and bracts ovate, acute ; pod glandular. — 

 Prairies, 111. to Minn., Tex., and westw. June-Sept. 



Var. floribiinda (Nutt.) Rydb. Flowers more numerous, slightly larger and 

 in denser racemes. {P. floribunda Nutt.) — Same range. 



5. P. argophylla Pursh. Silvery silky-white all over, erect, divergently 

 branched, 8-9 dm. high ; leaflets elliptical-lanceolate ; spikes interrupted ; flowers 

 8-10 mm. long ; lobes of the calyx and bracts lanceolate. — High plains, n. 

 Wise, to la., Mo., and westw. June. 



6. P. digitata Nutt. More slender and less hoary, 3-6 dm. high ; leaflets 

 linear- oblanceolate ; bracts of the interrupted spike obcordate ; calyx-lobes 

 oblong, acute. — Sandy soil, Kan. to Col. and Tex. June, July. 



H- -t- Fruit globose. 



7. P. lanceolata Pursh. Glabrous or nearly so, yellowish-green, densely 

 punctate ; leaflets 3, linear to oblanceolate ; flowers small, in very short spikes ; 

 calyx 2 mm. long, with short broad teeth. (P. micrantha Gray.) — la. and 

 Kan. to the Sask., and westw. 



* * * Leaves palmately b-foUolate ; root tuberous ; spike-like racemes dense. 



8. P. esculenta Pursh. Roughish hairy all over; stem stout, 1-4 dm. high, 

 erect, from a tuberous or turnip-shaped farinaceous root ; leaflets obovate- or 

 lanceolate-oblong ; spikes ellipsoid, long-peduncled ; lobes of the calyx and 

 bracts lanceolate, nearly equaling the corolla (1.2 cm. long). — High plains. 

 Wise, to Tex., and north westw. May-July. — The Pomme blanche, or Pommb 

 DE Prairie, of the voyageurs. 



25. AM6RPHA L. 



Calyx inversely conical, 5-toothed, persistent. Standard (the other petals 

 entirely wanting!) wrapped around the stamens and style. Stamens 10, mona- 

 delphous at the verj'^ base, otherwi.se 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, &ixop(pos, deformed, from the absence of four of the petals.) 



* Leaflets small (1.2 cm. long or less), crowded. 



1. A. canescens Pursh. (Lead Plant.) Whitened with hoary down, 3-14 

 dm. high ; leaflets 31-51, oblong-elliptical, becoming smoothish above ; spikes 

 usually clustered at the summit. — Hills and prairies, Ind. to Man., and southw. 

 June- Aug. 



2. A. microphylla Pur.sh. Nearly glabrous throughout, 3 dm. high or less ; 

 leaflets rather rigid ; spikes usually solitary. — Prairies, Minn, and Man. to 

 Kan. June, July. 



* * Leaflets larger, scattered. 



3. A. frutic5sa L. (False Indigo.) A tall shrub, rather pubescent or 

 smoothish; leaflets 9-25, oblong to broadly elliptical. — River-banks, s. Pa. to 

 Fla., w. to Sa.sk., Tex., and the Rocky Mts.; often cultivated, and escaping 

 eastw. May, June. (Mex.) — Very variable. 



Var. angustifblia l\irsh. Leaflets narrower, lance-oblong or lance-elliptic, 

 of firmer texture ; fruit somewhat smaller, 6-8 mm. long. {A. ungustifolia 

 Boynton.) — Banks of streams, la., westw. and south westw. 



