STUDIES IN THE COMPOSIT. 147 
spreading. The style-tips there are not only broad but con- 
nivent; here they are long, slender and divergent. The 
achenes in Oreastrum are scarcely compressed, and really 
ribbed, not merely striate as they have been said to be. 
. O. ALPIGENUM. Aplopappus alpigenus, Torr. & Gray, 
Fl.ii.241. Aster alpigenus, Gray, Proc. Am. Acad. viii. 389. 
Aster pulchellus, Eaton, Bot. King, 143, t. 16, according to 
Gray, yet perhaps this may prove specifically distinct. 
2. O. ANpERSONII. Erigeron Andersonii, Gray, Proc. Am. 
Acad. vi 540. Aster Andersonii, Gray, Proc. Am. Acad. 
vii. 352. 
3. O. ELATUM. Glabrous throughout, the scapiform 
branches decumbent at base, 14 to 20 inches high: radical 
leaves unknown, the lower cauline linear, acute, 4 to 6 inches 
long: heads very large, more than an inch broad, low-hemi- 
spherical; bracts of the involucre in about 3 series, the outer 
successively shorter, all with herbaceous triangular-subulate 
green upper portion, the lower half broadly linear, 3-nerved 
between four parallel and closely approximate whitish sub- 
cartilaginous ribs: rays deep violet: style-tips filiform: ova- 
ries glabrous or nearly so; pappus whitish. 
Collected on Mt. Dyer, in northeastern California, in young 
flowering state, July, 1879, by Mrs. R. M. Austin. A large 
plant, much resembling a large Pyrrocoma uniflora in some 
partieulars; the involucre perfectly glabrous as in no other 
Oreastrum, and the species more distinct from the two pre- 
ceding than they are from each other. 
LEUCELENE. 
Low perennials with diffusely branching leafy stems from 
a slender ligneous base. Leaves numerous, subulate and 
appressed, or more spreading and nearly linear. Heads 
small, solitary and terminal upon the nearly filiform ulti- 
20 
