512 LEGUMINOSAE (PULSE FAMILY^ 



Michx.)— Dry soU, Fla. to Tenn., Sandusky, O. (^Moseley) , s. Ind., and Kan, 

 June. 



* * Leaves palmately o-6-foliolate ; roots not tuberous. 



■t- Fruit more or less compressed-, ovate. 



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

 dm.hii, minutely hoary-puhesce.nt when young; leaflets varying from lineat 

 to obovate-oblong, 1.2-3.6 cm. long, glandular-dotted ; /oioers (4-6 mm. long) 

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

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



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

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



5. P. argophylla Pur.sh. Silvery silky-ivhite all over, erect, divergently 

 branched, 3-9 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. 



•1- -I- Fruit globose. 



7. P. lanceolata Pursh, Glabrous or neariy so, yello^vish-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-foliolate ; root tuberous; spike-like racemes dense. 



8. P. escul6nta 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-ped uncled ; 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 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, d^iop^os, deformed., from the absence of four of the petals.) 

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



1. A. caniscens Pursh. (Lead Plant.) Whitened ivith 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 south w. 

 June-Aug. 



2. A. microphyila Pursh. 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. fruticbsa 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 Sask., Tex., and the Rocky Mts.; often cultivated, and escaping 

 eastw. May. -Tune. (Mex.) — Very variable. 



Var. angustifolia Pursh. Leaflets narrower, lance-oblong or lance-elliptic, 

 of flrnier texture ; fruit somewhat smaller, 6-8 mm. long. (A. angustifolia 

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



