56 PITTONTIA. if 
Dr. Gray made note of the pinnatifid or pinnate-toothed foliage | 
of this plant with the dark-brown disk; but still better than 
this is a mark which seems not to have impressed him, the im- 
portance of which can not well be questioned. There is a stiff 
uprightness to stem, foliage and peduncles in Æ. tenuifolium, 
while in Æ. dadium not only are the peduncles filiform, long and — 
gracefully bending, the foliage is thin in texture and faleately | 
recurved. More numerous, or better characters for allied spe- | 
cies are not often found, than those which separate these. 
THELESPERMA FORMOSUM. Annual or biennial, near 7. fli | 
folium but more slender, branched from the base, the dissected 
leaves shorter and the segments though linear not attenuate; 
peduncles shorter, more numerous, the heads smaller, but rays 
much larger, light-yellow, the disk-flowers also yellow (dark- 
brown in 7. flifolium): outer involueral bracts shorter, more 
obtuse, much exceeded by the inner and these distinct much — 
below the middle: rays ł inch long, nearly 4 inch broad, crè- 
nately 4-toothed at apex: achenes slender, smooth on both faces; — 
awns of the pappus less stout, very acute. 7 
The type of this fine and very distinct Thelesperma is Mr. 
Heller’s n. 3747 from near Santa Fe, New Mexico, June, 1897. 5 
Its very showy pale-yellow rays and yellow disk mark it at first 
glance as different entirely from T. filifolium, and the characters : 
of achene and pappus are very pronounced. The real 7. fh- 
folium does not occur in the mountain districts of New Mexico. — 
VERNONIA OLIGANTHA. Slender, 2 feet high, leafy with broad — 
thin leaves up to the loose cyme of small heads, the herbage — 
green and to the unaided eye appearing glabrous: lowest leaves — 
4 inches long, the upper half as long, all lance-ebovate, acute, — 
tapering to the subpetiolar base, sharply but not deeply serrate, 
sparsely strigulose-roughened on both faces: involucres hardly © 
2 lines high, of few ovate-oblong obtuse mucronulate erect © 
bracts, the outermost very small and almost subulate; flowers 6 
or 8, three or four times the length of the involucre: achenes 
(immature) glabrous; outer pappus short and inconspicuous. 
In woods at Palmetto, Florida, 30 Noy. 1901, S. M. Tracy. 
