436 DESCRIPTIONS OF NEW SPECIES 



marked with ten somewhat elevated ribs. Pappus pilose, white and slender^ 

 in two or three series, slightly barbellate, about the length of the acheniura . 

 — Perennials, with the habit of Hieracium, as well as that of Crepis. Leaves 

 runcinately toothed, scapoid stems corymbose, branching. Flowers yellow. 

 — (The name alludes to the affinity with Crepis.) 



Crepidium * ru7icinatum; smooth; leaves oblong-lanceolate, runcinately and 

 incisely toothed, acute; scape branching, corymbose, few-ilowered ; involucrum 

 pubescent, the segments acuminate. Crepis biennis, Hooker, (according to a 

 specimen from the author,) not of Linnseus. It differs from the present, how 

 ever, in having somewhat hirsute leaves, and less deeply toothed. 



Hab. On the grassy plains of the Platte, in subsaline soils. Scape about a foot high, with seven 

 to nine capitiili, and a linear bracte at the base of each pedicel, as well as at the base of the bifur- 

 cation of the stem. Leaves much like those of the Dandelion, but less divided, green, and some- 

 what fleshy. Involucel about eight-leaved. 



Crepidium * glaucum; smooth and glaucous; leaves spathulate-lanceolate or 

 obovate, runcinately and incisely toothed, acute, attenuated below, but rather 

 broad to the base; scape smooth, divaricately branched, with minute bractes; 

 capituli small: involucrum smooth, the segments linear and somewhat obtuse. 



Hab. With the above, but less common; every where very smooth, the leaves much larger than 

 in the preceding, half a foot long, and one to one and a half inches wide, sometimes nearly entire, 

 rather thick and succulent. The scape twice forked, or more; about three flowers together at the 

 summits of the branches, not half the size of those of the preceding. Scape eighteen inches to two 

 feet high, terete and almost entirely naked, all the bractes being minute and subulate. Involucrum 

 of about twelve linear leaves ; involucel minute, of about eight lanceolate leaflets. Style and 

 stigmas very long and filiform, slightly pubescent. 



Crepidium * caulescens; very smooth, but not glaucous ; leaves spathulate- 

 lanceolate or oval-lanceolate, runcinately incise toothed and acute; stem scapoid, 

 naked, dichotomously branched, with a conspicuous toothed leaf at the base of 

 the first division; involucrum smooth, the segments la,nceolate-oblong. 



Hab. With the above, of which I, at first, took it for a mere variety; but the presence of a true 

 stem, though short, and the form of the sepals, distinguish it. 



CREPIS. (Moench, Decand.) 



§. *Leptotheca. — Involucrum cylindric, leaflets linear in a single series, (five 

 to eight;) involucel of three to five minute bractes; florets five to eight. Ache- 

 nium attenuated into a short, indistinct rostrum, similar with itself — Peren- 



