LEGUMINOS^E. (PULSE FAMILY.) 13-1 



# * Leaves palmately 3 - 5-foliolate ; roots not tuberous. 



4. P. tenilifl6ra, Pursh. Slender, erect, much branched and bushy 

 (2-4 high), minutely hoary-pubescent when young; leaflets varying from 

 linear to obovate-oblong (J-lJ' long), glandular-dotted; flowers (2-3" long) 

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

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

 Sept. 



5. P. argoph^lla, Pursh. Silvery silky-white all over, erect, divergently 

 branched (1 - 3 high) ; leaflets elliptical-lanceolate ; spikes interrupted ; lobes 

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

 westward. June. Flowers 4 - 5" long. 



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

 linear-oblanceolate ; bracts of the interrupted spike obcordate; calyx-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 palmately 5-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 BLANCHE, or 

 POMME DE PRAIRIE, of the voyageurs. 



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

 appressed hairs ; leaflets linear ; spikes short-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. AMOBPHA, 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. 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, tipoptyos, deformed, from the absence of four of the petals.) 

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



1. A. canescens, Nutt. (LEAD-PLANT.) Whitened with hoary down 

 (1-3 high); leaflets 15-25 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. raicroph^lla, Pursh. Nearly glabrous throughout, 1 high or 

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

 west to the Rocky Mts. 



