LEGUMINOS^.. (PULSE FAMILY.) 181 



* * Leaves palmateli/ 3 - b-fuliolate ; roots not tuberous. 



4. P. tenuifldra, J'ursh. Slender, erect, mjuh hraucheil aiid bushy 

 (2-4° liigli), ininutelji hmir n-puhesrcnt wlieii young; leaflets varying from 

 linear to obovate-obloug (^-1^' l<^"g), glandular-dotted ; y/owprji (2 -."J" long) 

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

 (P. tloribuiida, Niitt.) — Prairies, Minn, to 111., Tex., and westward. June- 

 Sept. 



5. P. argoph^lla, Pursh. -S"//f?pr//.s///7/-ir/(//eallover, erect, divergently 

 branched (l-.'i^ higli) ; leaflets elliptiral-lanceolate ; spikes interrupted ; loltcs 

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

 westward. June. — Flowers 4 - .')" long. 



6. P. digit^ta, Nutt. More slender and less hoary, 1 - 2° high ; leaflets 

 linear-oblanceolate ; bracts of the interrupted spike ol)cordate ; calvx-lobcs 

 oblong, acute. — Central Kan. to Col. and Tex. 



7. P. lanceol^ta, Pursh. Glal)rous or nearly so, yellowish green, densely 

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

 calyx 1" long, with short broa<l teeth. — Central Kan. to the Sask. and westward. 



* * * Leaves palmateli/ 5-foliolate ; root tuberous ; spike-like racemes dense. 



8. P. escul^Dta, Pursh. Rougliish hairy all over; stem stout (5-15' 

 high) and erect from a tuberous or turni])-shapcd farinaceous root; leaflets 

 obovate- or lanceolate-oblong; spikes oblong, long-peduncled ; lobes of tho 

 calyx and bracts lanceolate, nearly equalling the corolla (^' long). — High 

 plains, Sask. to Wise, Iowa, and Tex. June. The Tom-me blanch?:, or 

 Po.MME DK Prairie, of the voyageurs. 



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

 appressed hairs ; leaflets linear ; spikes short-capitate, on peduncles i - 2' long; 

 calyx narrow, 3-6" long. — Central Kan. to Col. and Tex. 



10. P. CUSpid^ta, 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-tootlied, persistent. Standard (the other petals 

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

 monadelphous at the very base, otherwise distinct. Pod ol)long, longer th:m 

 the calyx, l-2-seeded, roughened, tardily dehiscent. — Shrubs, with o<ld- 

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

 midvein excurrent. Flowers violet or i>uri)le, crowded in clustered termin;il 

 spikes. (Name, &iiop<pos, deformed, from the absence of four of the petals.) 

 * I^ods \-sreded ; leajlrls small (.^' long or less), croivdid. 



1. A. CaneSCenS, Nutt. (Lkai>-Plant.) Whittned with hoanj donn 

 (1-3° higli) ; leaflets 15-25 ])airs, oblong-ellij)tii-al, becoming sinoothish 

 above; spikes usually clustered at the summit. — Sask. to Ind. and Te.x., west 

 to the Rocky Mts. ; also eastward to (ia. 



2. A. microphylla, Pursh. Nearly glabrous throughout, 1° high or 

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

 west to the Kockv Mts. 



