628 FABACEAE 



blades elliptic to slighly obovate, 0.5-1.5 cm. long, appressed-silky, acute: spikes stout, 

 dense, 2-(3 cm. long : bracts lanceolate or oblong-lanceolate, 7-9 mm. long, acuminate : 

 flowers persistent : calyx densely villous-hirsute ; lobes bristle-like, about twice as long as 

 the tube : corolla purplish. 



On plains and prairies, Texas to Arizona. Summer and fall. 



10. Parosela argyrea (A. Gray) Heller. Foliage silky-pubescent. Stems erect, 

 3-6 dm. tall, corymbosely branched: leaflets 7-13, the blades oblong to oblong-obovate, 

 5-12 mm. long, obtuse, glandular beneath, the pubescence lustrous on the upper surface : 

 spikes subglobose becoming oblong, 1-3 cm. long : bracts ovate, 2.5 mm. long, acuminate: 

 calyx densely pubescent, surpassing the bracts ; lobes lanceolate, somewhat shorter than 

 the tube : corolla yellowish purple. 



In dry soil, Texas and Mexico. Spring to fall. 



11. Parosela mollis ( Benth. ) Heller. Foliage finely pubescent. Stems branched at 

 the base, the branches pale, more or less spreading, irregular : leaflets 9-13, the blades 

 obovate to cuneate, 3-8 mm. long, truncate or retuse at the apex, villous : spikes con- 

 spicuously elongating, but the flowers deciduous : bracts linear-lanceolate, 3-7 mm. long, 

 acuminate, early deciduous : calyx densely pubescent ; lobes subulate, much longer than 

 the tube : corolla purple. 



On plains, Texas to California and adjacent Mexico. Spring to fall. 



12. Parosela lanata (Spreng. ) Britton. Foliage silky-woolly or merely woolly. 

 Stems branched at the base, the branches decumbent, 2-6 dm. long, more or less difflisely 

 branched : leaflets 9-13, the blades 4-12 mm. long, obtuse, truncate or retuse at the apex, 

 Biostly cuneate, often contiguous : spikes 2-10 cm. long, about 1 cm. thick during anthesis, 

 many-flowered, on peduncles 1-2 cm. long : bracts ovate, acuminate, 3-4 mm. long : calyx 

 campanulate, 3-3.5 mm. long ; lobes lanceolate or deltoid-lanceolate below the subulate 

 tips, shorter than the tube : corolla deep jjurple or red, 6-7 mm. long. 



On plains and prairies, Kansas to Utah, Texas and New Mexico. Summer. 



13. Parosela Doming^nsis ( DC. ) Heller. Foliage more or less densely velvety pubes- 

 cent and glandular. Stems erect, 1-3 m. tall, branching : leaflets 13-15, the blades oval, 

 oblong, obovate or cuneate, 4-8 mm. long, rounded or retuse at the apex, flat : spikes solitary 

 or paniculate, 1-3 cm. long : bracts ovate, acuminate : calyx silky, surpassing the bract ; 

 lobes subulate, plumose, longer than the tube : corolla mainly purplish, or sometimes 

 nearly white. 



In sand or dry soil, Florida and Texas. Also in tropical America. Throughout the year. 



14. Parosela thyrslflora ( A. Gray) Vail. Foliage finely and often closely pubescent. 

 Stems erect, often 1-2 m. tall, branching, woody : leaves numerous, often spreading or 

 reflexed, 2-6 cm. long, with short petioles : leaflets 7-9, the blades oblong, oval or broadest 

 above the middle, 5-10 mm. long, obtuse or retuse at the apex, much paler beneath than 

 above : spikes sessile or nearly so, in the upper axils, 1-2 cm. long : bracts lanceolate or 

 oblong-lanceolate, acuminate : calyx becoming about 5 mm. long ;tube ribbed at maturity ; 

 lobes subulate, sparingly plumose, slightly longer than the tube : corolla 6-7 mm. long. 

 l^Dalea Domingensis var. paucifolia Coulter. ] 



In dry soil, Texas and adjacent Mexico. Spring to fall. 



15. Parosela frut6scens (A. Gray) Vail. Foliage glabrous. Stems erect, 3-6 

 dm. tall, widely branched : leaflets 13-17, the blades obovate to cuneate, 1-5 m. long, 

 retuse or notched at the apex, glandular beneath : spikes subglobose to oblong, 1-2 cm. 

 long, few-flowered : bracts ovate, obtuse : calyx strongly ribbed ; tube glabrous, covered with 

 large glands ; lobes triangular, acute, ciliate, much shorter than the tube : corolla violet. 



In dry soil, Texas to New Mexico and Mexico. Spring to fall. 



33. PETALOSTEMON ]\Iichx. 



Perennial caulescent herbs, with glandular foliage. Leaves alternate : blades un- 

 equally pinnately compound : leaflets often broadest above the middle and involute. 

 Flowers perfect, in short or elongated spikes ; these not subtended by involucres. Calyx- 

 lobes rather broad, shorter than the tube. Corolla white, pink, purple, violet or yellow- 

 ish : standard broad, more or less abruptly narrowed into a claw : wings and keel-petals 

 similar. Stamens 5, monadelphous. Ovary sessile. Style subulate. Ovules mostly 2 in 

 each cavity. Pod short, mostly indehiscent. Seed solitary. Prairie-clover. 



