28 7 



VOL. II.] PEA FAMILY. 



3. Amorpha canescens Pursh. Lead-plant. 

 Shoe-strings. (Fig. 2103.) 



Amorpha canescens Pursh, Fl. Am. Sept. 467. 1814. 



A bushy shrub, i-3 high, densely white-canescent 

 all over. Leaves sessile or very nearly so, numerous, 

 2 / -4 / long; leaflets 21-49, approximate, almost sessile, 

 oval or short-lanceolate, obtuse or acutish and mucron- 

 ulate at the apex, rounded or truncate at the base, 4"- 

 7" long, 2 // -3 // wide, less pubescent above than be- 

 neath; spikes usually densely clustered, 2 / -7 / long; 

 calyx-teeth lanceolate; standard bright blue, nearly 

 orbicular or obcordate, about 2" long; pod slightly 

 exceeding the calyx, i-seeded. 



Prairies, Indiana to Minnesota and Manitoba, south to 

 Louisiana and Texas. Named from its leaden-hue, not as 

 indicative of lead. July-Aug. 



16. PAROSELA Cav. Desc. 185. 1802. 

 [DALEA Willd. Sp. PI. 3: 1336. 1803. Not P. Br. 1756.] 



Herbs, or sometimes shrubs, with usually glandular-punctate foliage, odd-pinnate leaves, 

 minute stipules, and small purple white or yellow flowers in terminal or lateral spikes. 

 Calyx-teeth nearly equal; standard cordate or auriculate, clawed; wings and keel mainly 

 exceeding the standard, adnate by their claws to the lower part of the stamen-tube. Sta- 

 mens 10 or 9, mouadelphous; anthers uniform. Ovary sessile or short -stalked; ovules 2 or 3; 

 style subulate. Pod included in the calyx, membranous, mostly indehiscent and i -seeded. 

 [Anagram of Psoralea.~\ 



About no species, natives of western North America, Mexico and the Andean region of South 

 America. In addition to the following some 42 others occur in the western United States. 



Spikes elongated, narrow, loosely flowered. 



Foliage glabrous; corolla white; leaflets linear. i. P. enneandra. 



Foliage pubescent; corolla purple; leaflets obovate. 2. P. lanata. 

 Spikes oblong, thick, densely flowered. 



Foliage glabrous; corolla pink or white; leaflets 15-41. 3. P. Dalea. 



Foliage pubescent; corolla yellow; leaflets 5-9. 4. P. aurea. 



i. Parosela enneandra (Nutt.) Britton. 

 Slender Parosela. (Fig. 2104.) 



Dalea enneandra Nutt. Fraser's Cat. 1813. 

 Dalea laxiflora Pursh, Fl. Am. Sept. 741. 1814. 



Parosela enneandra Britton, Mem. Torr. Club, 5: 196. 

 1894. 



Erect, glabrous, i-4 high, with numerous slen- 

 der ascending branches. Leaflets 5-11, linear or 

 linear- oblong, obtusish, 2 // -5 // long, ^ // -i // wide, 

 narrowed at the base, nearly sessile; spikes numer- 

 ous, 2 / -5 / long, loosely flowered; bracts obtuse, 

 nearly orbicular, punctate, membranous-margined, 

 \ l /z" long, often mucronate; flowers 4 // ~6 // long; 

 calyx-teeth subulate, beautifully plumose, shorter 

 than the white corolla; standard small, cordate; 

 keel exceeding the wings; stamens 9. 



Prairies, Iowa to Nebraska and Colorado, south to 

 Mississippi and Texas. June-Aug. 



