330 PROCEEDINGS OF THE AMERICAN ACADEMY. 
single, terminal, short-peduncled, less frequently 3-4, corymbose, in- 
cluding the rays 11-1} inches in diameter: involucre of few subequal 
lance-linear attenuate finely pubescent and ciliolated scales; the latter 
loosely imbricated in 2-83 series, rather firm and broadly white-mar- 
gined near the base, 4 lines long; the very acute tips often purplish: 
rays 12-18, white or pink, 6 lines in length, 1} lines in breadth, 
3-toothed at the apex; disk flowers including the silky achenes 5 lines 
in length: pappus rather copious, of unequal bristles but not distinetly 
double. — A. Engelmanni, Gray, var.(?) paucicapitatus, Robinson, 
Proc. Am. Acad. xxvi. 176.— Collected by C. V. Piper in the 
Olympic Mountains, Washington, August and September, 1890 (nos. 
926, 934). Never satisfied with the earlier and somewhat provisional 
disposition of this plant, I have returned to its study, and conclude 
that it is specifically distinct from A. Engelmanni, through its much 
less imbricated involucre of subequal scales. It should stand in the 
genus near A. Xylorhiza, Torr. & Gray. 
Droscorea Duecesi. Stem slender, climbing, angulate, sparingly 
pubescent with fine brown hairs: leaves ovate, cordate, sharply acuml- 
nate, thin, 9-nerved, pellucid-lineolate, nearly or quite smooth, 2} inches — 
jong, 2 inches broad; petioles pubescent, 14 inches long: staminate i 
flowers 14 lines in diameter, borne in short slender simple solitary — 
axillary pubescent racemes 14-2 inches in length: peduncles but 2 — 
lines long; pedicels scattered, $ line in length, 1-3-flowered : brane 
subulate, considerably exceeding the pedicels: segments of the perianth 4 
linear-oblong or linear-lanceolate, obtuse, with crisped margins : at : 
mens six, equal, inserted on the perianth near its base, half as long — 
asthe segments. (Fertile plant not seen.) — Collected by Frof. Alfred 
Dugés at Guanajuato, 1880 (no. 37). A slender species, somewhs" 
resembling D. remotiflora, Kunth. 
