FABACEAE 629 
Corolla white or yellowish. 
Foliage densely villous-silky : corolla yellowish. | 1. P. obovatus. 
Foliage glabrous or thinly pubescent : corolla white. 
Leaflets 13-37. 
Calyx pubescent: leaflets 29-37. 2. P. microphyllus. 
Calyx merely ciliate: leaflets 13-17. 3. P. phleoides. 
Leaflets 3-11. 
Spikes cylindric or oblong. 
apes with a relatively narrow blade cuneate or constricted at the 
ase. 
Standard with a very broad blade cordate at the base. 
Braets with long-acuminate tips. 
Braets with short tips. 
4. P. albidus. 
5 
Stems and branches prostrate-spreading : spikes mainly 1-2 em. long. " P. gracilis. 
8 
. P. candidus. 
Stems and branches erect or ascending: spikes mainly 2-3 cm. long. 7. P. oligophyllus. 
Spikes globular or ovoid. . P. multiflorus. 
Corolla colored, usually pink, rose or purple. 
Upper leaves with 11-31 leaflets. 
Foliage densely villous. 9. P. griseus, 
Foliage glabrous or minutely pubescent. 
Calyx silky-villous : annual. 10. P. emarginatus. 
Calyx glabrous ; perennial. 
Leaflets of an oblong type: calyx 4 ‘mm. long, about equalling the per- 
sistent bracts. 11. P. foliosus. 
Leaflets of a linear type: calyx 3 mm. long, much surpassed by the de- j 
a ciduous bracts. i2. P. Sabinalis. 
Upper leaves with 3-9 leaflets. 
Calyx copiously pubescent. 
Pubescence of the calyx villous or silky-villous. 
Leaflets linear or nearly so: bracts surpassing the buds. 
Bracts with glabrous or merely puberulent tips. Á 
Upper part of the plant with gray pubescence: calyx not ribbed : 
Spikes dense. 13. P. purpureus. 
Upper part of the plant with tawny pubescence: calyx ribbed: ; 
spikes loose. 14. P. Porterianus. 
Bracts with pubescent tips. 
Tips of the bracts about as long as the bodies: pubescence tawny : 
[eni 
. leaflets obtuse. 15. P. tenuifolius. 
Tips of the bracts much longer than the bodies: pubescence í j 
ray : leaflets acute. 16. P. Gattingert. | 
Leaflets oblong or oblanceolate: bracts shorter than the buds. 17. P. Reverchonii. 
Pubescence of the calyx of short close-set appressed hairs. 
Calyx-tube glabrate, glaucous. 18. P. pubescens. 
Calyx-tube copiously pubescent, not glaucous. : 
Braets shorter than the buds, and mature calyx : leaflets with tightly: 
involute blades, about 1 mm. wide. 
Spikes less than 1 cm. thick, slender: calyx 3 mm. long 
Spikes over 1 cm. thick, stout: calyx 4 mm. long. 2 
Bracts longer than the buds, and mature calyx: leaflets with nearly 
19. P. Stanfieldii. 
0 / 
flat blades 2-4 mm. wide. 21. P. decumbens. 
22 
23 
20. P. tenuis. 
Calyx glabrate or merely ciliate.' 
Spikes, or the most them, cylindric. 
Spikes subglobose. 
. P. carneus. 
. P. Feayi. 
l. Petalostemon obovàtus T. & G. Plant densely villous-silky. Stems erect or 
ascending, several dm. tall: leaflets 5-9, the blades obovate to elliptic, 8-10 mm. long, 
truncate or acute at the apex, cuneate to rounded at the base: spikes cylindric, 5-11 cm. 
ong: bracts oval-elliptic, with slender tips: calyx copiously pubescent ; tube somewhat 
ribbed ; lobes subulate-lanceolate, nearly as long as the tube: corolla yellowish, rather 
inconspicuous. 
In dry soil, Texas. Spring and summer. 
2. Petalostemon microphyllus T. & G. Plant somewhat villous and glandular. 
Stems more or less branched at the base, the branches erect or ascending, 2-6 dm. tall : 
ete 29-37, the blades oblong to oblong-cuneate, 4-6 mm. long, emarginate, glandular- 
goned : Spikes narrowly cylindric, 2-5 cm. long: bracts closely pubescent, with long fili- 
orm-subulate tips : calyx much shorter than the bracts ; tube eampanulate ; lobes trian- 
» barely 4 as long as the tube: corolla white; standard with a broadly ovate cordate 
ade, the other petals with linear or nearly linear blades. 
In dry soil, Texas. Spring and summer. 
3. Petalostemon phleoides T. & G. Plant sparingly villous or glabrate. Stems 
usually branched at the base, the branches erect or ascending, 3-7, dm. long, simple or spar- 
ingly branched: leaflets 13-17, the blades oblong to cuneate-oblong, 3-10 mm. long, 
usually rounded at the apex, glandular beneath, cuneate at the base: spikes cylindric, 
:9-5 cm. long: bracts with subulate-filiform tips, early deciduous: calyx oblique ; tube 
Ctr ener ; lobes very short, often only 4 or 1 as long as the tube : corolla white ; stand- 
ard with a hooded cordate blade ; the other petals with linear blades. 
In dry soil, Arkansas and Texas. Spring and summer, 
