LEGUMINOS^. (pulse FAMILY.) 131 



* * Leaves palmateltj S-b-foliolate ; roots not tuberous. 



4. P. tenuifl6ra, Pursh. Slender, erect, much branched and bushv 

 (2-4° high), minutelj/ hoary-pubescent when young; leaflets varviug from 

 linear to obovate-oblong (^-1^' long), glandular-dotted; flowers (2-3' long) 

 in loose racemes ; lobes of the calyx and bracts o^•ate, acute ; pod glandular. 

 (P. floribunda, Nutt.) — Prairies, Minn, to 111., Tex., and westward. June - 

 Sept. 



5. P. argophylla, Pursh. Silver)/ silky-ivhite all over, erect, divergentlv 

 branched (l-.S*^ high); leaflets elliptical-lanceolate; spikes interrupted; lobes 

 of the calyx and bracts lanceolate. — High plains, X. Wise, to Iowa, Kan., and 

 westward. June. — Flowers 4 - 5" long. 



6. P. digitata, Xutt. More slender and less hoary, 1 - 2° high ; leaflets 

 linear-oblauceolate ; bracts of the interrupted spike obcordate ; calvx-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 pal matelij b-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 (^ long). — High 

 plains, Sask. to Wise, Iowa, and Tex. June. The Pomme blanxhe, or 

 PoMME DE Prairie, of the voyageurs. 



9. P. hypogsea, Xutt. Tuber small; nearly acaulescent, hoary with 

 appressed hairs ; leaflets linear ; spikes sliort-capitate, on peduncles ^ - 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. — vShrubs, with odd- 

 pinnate leaves ; the leaflets marked with minute dots, usually stipellate, the 

 midvein excurrent. Flowers violet or purple, crowded in clustered terminal 

 spikes. (Xame, ajxop^os, deformed, from the absence of four of the petals.) 

 * Pods l-seeded ; leaflets small (Y long or less), crowded. 



1. A. eanescens, Xutt. (Lead-Plaxt.) Whitened icith hoary down 

 (1-3° high); leaflets 1.5-2.5 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° high or 

 less ; leaflets rather rigid ; spikes usually solitary. — Sask. to Minn, and Iowa» 

 west to the Rockv Mts. 



