314 PROCEEDINGS OF THE AMERICAN ACADEMY. 
phila most closely resembles C. petrophila, Gray, but from this species it 
is readily distinguished by the inflorescence, and by the much larger 
heads. In the nature of the inflorescence C. rhyacophila is perhaps 
more nearly allied to C. anthemoides, DC., but from this species again 
our plant differs markedly in the coarser character of the leaves, and by 
the erect ligneous stem. 
Spilanthes filipes. Herbaceous: stems erect, freely branching from 
the base, 3 to 4 dm. high, rather sparsely pubescent with jointed hairs: 
leaves opposite, petiolate, 3-nerved from near the base, ovate to oblong- 
lanceolate, including the petiole 2.5 to 6 cm. long, 0.8 to 2 cm. broad, . 
obtusish, submucronate, crenate-dentate, narrowed rather abruptly or 
even attenuate at the base into a ciliated petiole, glabrous or with a few 
scattered hairs on the upper surface and on the midrib and lateral nerves 
beneath: heads radiate, 4 to 5 mm. high, nearly or quite as broad, borne 
on long slender (5 to 10 em. long) peduncles which either terminate the 
stems and branches or spring from the upper axils; involucral scales 
oblong-ovate, 2 to 2.5 mm. long, slightly acuminate, acute, inconspicu- 
ously ciliate; ligules about 5, including the tubular portion 4 mm. in 
length; achénes of ray-flowers triangular: flowers of the disk 2.5 mm. 
long; achenes laterally compressed bearing two minute pappus-awns, 
ciliated, glabrous or nearly so on each face, at maturity about 1 mm. in 
length; pales rounded or subtruncate at the apex.— Collected by Dr. 
G. F. Gaumer in Yucatan, 1896, no. 1122. In general appearance 
S. filipes most resembles S. ramosa, Hemsl., but it differs materially by 
having much larger leaves, smaller heads, and stricter habit. 
Dysodia Seleri,-Rosinson & GREENMAN, n. sp. Stoutish herb: 
branches terete, striate, puberulent, at length glabrate, glandless: leaves 
simple, opposite or sub-opposite, oblong, shortly acuminate, rounded or 
more often cordate at the sessile base, sharply and rather finely serrate, 
6 to 13 cm, long, 2.4 to 4 cm. broad, dotted with numerous round pellu- 
cid glands; the uppermost leaves reduced, elliptical, often alternate: 
- peduncles terminal, more or less clavate-thickened toward the summit: 
heads radiate, large, 3 em. in diameter exclusive of the ligules: involucre 
puberulent, glandless; outer scales free, about 2-seriate, ‘cneguel. lanceo- 
late, acute, herbaceous at least near the apex; inner ,scales united for 
two-thirds their length, their tips attenuate: rays 12 to 20, brown in @ 
dried state, broadly elliptical, about 2 cm. long including the tapering 
tubular base ; pales short, thickish, fimbriate: tubular flowers 2 cm. long 
including the sericeous-villous achenes: pappus 2-seriate, of about 20 
Se ey Setose-fimbriate scales, 1 em. in length: style-branches passing 
