628 FABACEAE 



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

 dense, 2-6 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 r 

 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 mdllis (Benth. ) Heller. Foliage finely pubescent. Stems branched at 

 the base, the branches pale, more or Jess 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 diffusely 

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

 Costly 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 purple or red, 6-7 mm. long. 



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



13. Parosela Dominge~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 thyrsiflora (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. 

 \_Dalea Domingensis var. paucifolla Coulter. ] 



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



15. Parosela frute'scens (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 Michx. 



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. 



