310 LEGUMINOSiE. Petalostemon. 



rachis villous. Bracts as long as the flower. Petals linear-oblong, narrowed 

 at the base and nearly sessile, white. 



5. P. villosum (Nutt.) : stem tomentose, decumbent ; leaves silky-villous ; 

 leaflets 6-7 pairs, lanceolate-oblong, rather acute, mucronate ; spikes cylindri- 

 cal, on short peduncles ; calyx villous ; the teeth semi-ovate, shorter than the 

 tube ; petals oblong-obovate ; vexiUum oblong. — Niitt. ! gen. 2. p. 85 ; Torr. ! 

 in Sill. Jour. 4. p. 66 ; DC. prodr. 2. p. 243. 



Sandy banks ot the upper part of the Missouri, Nuitall, Dr. James ! Upper 

 Mississippi, Maj. Douglas! — August. — 11 Root fusiform, thick and red- 

 dish. Stems several from one root. Leaflets 3-4 lines long, slightly dotted, 

 but the glands concealed by the dense pubescence. Spikes 1-2 inches long. 

 Bracts lanceolate, acuminate, longer than the flower. Corolla rose-color. — 

 The Avhole plant turns yellowish in drying. 



6. P. griseum: grayish pubescent ; stem nearly erect ; leaflets 5-6 pairs, 

 lanceolate-oblong and linear-oblong, acute, mucronate, thickly and conspicu- 

 ously dotted beneath ; spikes cylindrical, on shortish peduncles; calyx dense- 

 ly silky-villous, somewhat glandular, rather shorter than the bracts; the teeth 

 semi-ovate, shorter than the tube ; petals ovate ; vexillum cordate. 



Pine woods near the Sabine River, Dr. Leavenworth! Texas, Drum- 

 mond! — Plant 2-3 feet high, terete, of a reddish color, usually branched in 

 a paniculate manner either near the summit or from the middle upward. 

 Leaflets 5-6 lines long, rather thinly pubescent on both surfaces with soft 

 appressed hairs. Spikes about 2 inches long. Bracts subulate, as long as 

 the flowers. Corolla pale rose-color. Petals scarcely acute at the base, as 

 long as the vexiUum. — The dried plant is of a duU grayish-green color. 

 Nearly allied to the preceding species, but readily distinguished by its much 

 less dense pubescence and conspicuously dotted leaves. 



7. P. phleoides : stem pubescent; leaflets (particularly the margins) and 

 petioles hairy ; leaflets 6-S pairs, linear-oblong, conspicuously dotted beneath; 

 spikes cylindrical, on long peduncles ; bracts awned, longer than the calyx, 

 hairy ; calyx glabrous, hairy on the margin, naked with large glands, cleft or 

 obliquely truncated at the upper side ; the teeth very short approximated to 

 the lower side ; petals lanceolate-linear ; vexillum broadly cordate. 



P.microphyUum: leaves very numerous; leaflets 14-18 pairs, nearly lin- 

 ear, very small; calyx hairy. 



Arkansas, Dr. Leavenworth ! P. Texas, Drummond ! — (l) About 2 feet 

 high, simple {p. branched at the summit). Spikes about 2 inches long. 

 Leaflets 4-5 lines long (in /?. 2-3 lines long, closely approximated). Calyx 

 marked with large resinous glands. Petals extremely narrov/, acute at the 

 base, white : claw of the vexiUum passing through the deep notch of the 

 calyx. 



8. P. obovatum : very tomentose (without glands?) ; stem erect or ascend- 

 ing ; leaflets 4 pairs, obovate, obtuse, silky-lanuginous beneath ; spike sub- 

 sessile, ovate, very thick ; bracts ovate, acuminate, larger than the calyx, 

 both densely villous ; teeth of the calyx subulate, as long as the tube ; vexil- 

 lum ovate, subcordate. 



Texas, Drummond ! — Whole plant almost woolly with soft grayish hairs. 

 Stem thick. Leaflets rather remote, more than half an inch long, 3-4 lines 

 wide. Bracts almost concealing the flowers, concave with a long acumi- 

 nate point. Vexillum (pale purple?) with the claAV as long as the limb; 

 the other petals not seen. — Remarkable for its large and broad leaflets, and 

 very thick subsessile spike. 



9. P. violaceum (Michx.) : somewhat pubescent or glabrous ; leaflets 2 

 pairs, linear, with a few glands beneath; spikes very dense, varying from 

 globose-ovate to oblong-cylindrical, pedunculate j calyx sUky-canescent ; teeth 



