120 PROCEEDINGS OF THE AMERICAN ACADEMY. 
1 to 2 dm. long, 2 to 8 cm. broad, acuminate, acute, serrulate, narrowed 
at the base into a 3 to 5 mm. long petiole, dark green and glabrous 
above, arachnoid-tomentulose beneath, pellucid-punctate, subparallel 
5-nerved; midrib and the two pairs of lateral nerves prominent on the 
under side of the leaf-blade: heads of pistillate flowers large, 4 to 5 cm. 
high, 5 to 7 em. broad, terminating the stem and branches on short 
stout peduncles: involucre about 8-seriate, arachnoid-tonientose ; scales 
of the involucre lance-acuminate, appressed or slightly squarrose, the 
outer successively shorter: rays about 1 cm. long, 2 mm. broad: disk- 
flowers numerous; pappus of many slender sete: heads of staminate 
flowers about 2 em. high and broad, on short peduncles: involucre 
4-5-seriate, arachnoid-tomentose; scales of the involucre lance-oblong, 
obtuse, appressed or very slightly spreading, the outer shorter than the 
inner ; rays narrowly oblong, 10 to 12 mm. long, 3 mm. broad. — Costa 
Rica. Foréts des collines de Nicoya, February, 1900, Ad. Tonduz, no. 
13,602 (hb. Gr., and hb. Inst. Phys.-Geog. Cost. Ri.), pistillate plant ; 
boussailles a Nicoya, January, 1900, Ad. Tonduz, no. 13,620 (hb. Gr., 
and hb. Inst. Phys.-Geog. Cost. Ri.), staminate plant. 
Notwithstanding the considerable difference in the size of the heads 
of the two specimens above cited, the writer has no doubt that they 
represent the pistillate and staminate plants of one species. In the stem 
and foliar characters there is absolute identity. 
