(by) 
* * * Calyx smooth except the margins, with short teeth. 
17. D. frutescens Gray. Shrubby and very smooth, 3 to6 dm. high: leaflets 6 
to 8 pairs, obovate, retuse or obcordate, petiolulate, conspicuously glandular beneath: 
spikes paniculate, short and few-flowered; bracts coriaceous, ovate, pointless, 
searcely equaling the calyx, which is covered with large waxy glands and with short 
triangular-subulate teeth villous on the margin: corolla violet.—Common from the 
Colorado to the Rio Grande and west to New Mexico. 
13. PETALOSTEMON Michx. (PRAIRIE CLOVER.) 
Perennial upright glandular-dotted herbs, with crowded odd-pinnate 
leaves, minute stipules, small flowers in very dense terminal and pedun- 
cled heads or spikes, 5 stamens with the cleft tube of filaments bearing 
4 of the petals on its summit, and a membranaceous indehiscent 1 or 2- 
seeded pod inclosed in the calyx. 
* Corolla white: glabrous plants. 
1. P. candidus Michx. Stems firm and erect: leaflets 7 or 9, lanceolate or linear- 
oblong, sparingly dotted beneath: heads oblong, cylindrical when old ; bracts awned, 
longer than the nearly glabrous calyx.--Common on the prairies of northern and 
western Texas, 
2. P. gracilis Nutt. Stems slender, decumbent or assurgent: leaflets 7 or 9, lin- 
ear-elliptical, slightly dotted beneath: heads oblong-cylindrical, shorter than in the 
last; bracts acute, as long as the calyx.—A species of eastern Texas, and found 
within our range near San Diego. 
3. P. multiflorus Nutt. Stem erect and with fastigiate branches: leaflets 3 to 9, 
linear-oblong, with black dots on both surfaces: heads globose, the subulate-setaceous 
bracts much shorter than the acutely-toothed calyx.—On prairies throughout Texas, 
** Corolla purple or rose- color (yellowish in No.5, or fading white in No. 7). 
4. P. violaceus Michx. Smoothish: leaflets 5, narrowly linear: heads globose- 
ovate, or oblong-cylindrical when old; bracts pointed, not longer than the silky- 
hoary calyx: corolla rose-purple.—Dry prairies throughout the western prairie States 
and extending into Texas.—Var. PUBESCENS Gray is pubescent, and with 3 to 7 leaf- 
lets.—Prairies in the region of the Colorado.—Var. TENUIS Coulter is a slender, low 
form, with round or roundish-oblong small often few-flowered heads on long slender 
peduncles, and shorter pointed bracts (not equaling the calyx and hence not very 
apparent in the head).—Coleman County. 
5. P. obovatus Torr. & Gray. Very tomentose: leaflets 5 to 9, large, obovate, 
obtuse, silky-lanuginous beneath, less so above: head ovate, or becoming much 
elongated, very thick, subsessile or pedunculate; bracts ovate, acuminate, larger than 
the calyx, both densely villous, almost concealing the yellowish flowers.—In eastern 
Texas, and found within our range near San Antonio. 
6. P. emarginatus Torr. & Gray. Glabrous: leaflets about 15 or 17, cuneiform, 
deeply emarginate, dotted beneath: spikes cylindrical, on very long peduncles ; 
bracts broadly obovate, acuminate, silky-villous, longer than the bright rose-purple 
flowers: calyx very villous.—In eastern Texas and also between the Nueces and the 
Rio Grande. The leaves become verdi gris-green when dry. 
7. P. Sabinalis Watson. Glabrous throughout: leaves yellowish-green ; leaflets 
11 to 15, linear, obtuse: spikes rather slender, pedunculate; bracts very narrow and 
attenuate, equaling the calyx: calyx with short triangular acute teeth, pubescent 
on the inner side, about half as long as the rose-colored (fading to nearly white) 
petals.—Bandera County (Reverchon). 
8. P. Reverchoni Watson. Low, 15 cm, high or less, finely pubescent: leaves gla- 
brous; leaflets 5 to 11, linear, acutish: spikes sessile or nearly so, very short or some- 
