4. D. lanàta, Spreng. Very pubescent throughout, 1--2° high, branching; leaflets obovate to oblong-obovate, 2--3´´ long; spikes slender, rather loose, the obovate acute bracts equalling the small short-toothed calyx; petals short, purple.--Central Kan. to Tex., and westward. 16. PETALOSTÈMON, Michx. PRAIRIE CLOVER. Calyx 5-toothed. Corolla indistinctly papilionaceous; petals all on thread-shaped claws, 4 of them nearly similar and spreading, borne on the top of the monadelphous and cleft sheath of filaments, alternate with the 5 anthers; the fifth (standard) inserted in the bottom of the calyx, heart-shaped or oblong. Pod membranaceous, enclosed in the calyx, indehiscent, 1--2 seeded.--Chiefly perennial herbs, upright, glandular-dotted, with crowded odd-pinnate leaves, minute stipules, and small flowers in very dense terminal and peduncled heads or spikes. (Name combined of the two Greek words for petal and stamen, alluding to the peculiar union of these organs in this genus.) 1. P. violàceus, 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, Minn. to Ind. and Tex., west to the Rocky Mts. July. 2. P. cándidus, Michx. _Smooth; leaflets 7--9, lanceolate or linear-oblong; heads oblong_, when old cylindrical; bracts awned, longer than the nearly glabrous calyx; _corolla white_.--With n. 1. 3. P. villòsus, Nutt. _Soft-downy or silky_ all over; _leaflets 13--17, linear or oblong_, small (4--5´´ long); _spikes cylindrical_ (1--5´ long), short-peduncled, soft-villous; _corolla rose-color_.--Wisc. to Mo., west to the Rocky Mts. 4. P. foliòsus, Gray. _Smooth_, very leafy; _leaflets 15--29, linear-oblong; spikes cylindrical_, short-peduncled; bracts slender-awned from a lanceolate base, exceeding the glabrous calyx; _petals rose-color_.--River-banks, Ill. and Tenn. 5. P. multiflòrus, Nutt. _Glabrous_ throughout, erect, branching; leaflets 3--9, linear to oblong; _spikes globose_, the subulate setaceous bracts much shorter than the acutely toothed calyx, petals white.--Kan. to Tex. 17. TEPHRÒSIA, Pers. HOARY PEA. Calyx about equally 5-cleft. Standard roundish, usually silky outside, turned back, scarcely longer than the coherent wings and keel. Stamens monadelphous or diadelphous. Pod linear, flat, several seeded, 2-valved.--Hoary perennial herbs, with odd-pinnate leaves, and white or purplish racemed flowers. Leaflets mucronate, veiny. (Name from τεφρός, _ash-colored_ or _hoary_.) 1. T. Virginiàna, Pers. (GOAT'S RUE. CATGUT.) _Silky-villous_ with whitish hairs when young; _stem erect and simple_ (1--2° high), _leafy_ to the top; leaflets 17--29, linear-oblong; flowers large and numerous, clustered in a terminal _oblong dense raceme or panicle_, yellowish-white marked with purple.--Dry sandy soil. June, July.--Roots long and slender, very tough.