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, 
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 diffusely 
branched : leaflets 9-13, the blades 4-12 mm. long, obtuse, truncate or retuse at the apex, 
mostly 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. ParoselaDomingénsis (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 retuseat 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 thyrsifldra (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. Jong. 
[Dalea Domingensis var. paucifolia Coulter. | 
In dry soil, Texas and adjacent Mexico. Spring to fall. 
15. Parosela frutéscens (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, covere M t 
large glands ; lobes triangular, acute, ciliate, much shorter than the tube : corolla violet. 
In dry soil, Texas to New México and Mexico. Spring to fall. 
33. PETALÓSTEMON Michx. 
Perennial caulescent herbs, with glandular foliage. Leaves alternate : blades un- 
equally pinnately compound: leaflets often broadest above the middle and iara 
Flowers perfect, in short or elongated spikes ; these not subtended by involucres. cin 
lobes rather broad, shorter than the tube. Corolla white, pink, purple, Meyer inet 
ish : standard broad, more or less abruptly narrowed into a claw: wings and an eee 
similar. Stamens 5, monadelphous. Ovary sessile. Style subulate. Ovules mostly 
each cavity. Pod short, mostly indehiscent. Seed solitary. PRAIRIE-CLOVER- 
