SEPT. 19,1923 KILLIP: NEW URTICACEAE FROM COLOMBIA 355 
The genus Pilea, to which most of the following plants belong, 
contains over 200 species, the greater part of them occurring in the 
tropics of the New World. Weddell devides the genus into three 
main groups, Integrifoliae, Heterophyllae, and Dentatae. The last 
consists of two sections, containing those species that are glabrous, 
with either long or short peduncles, and those that are pubescent, with 
either long or short peduncles. This method of classification is fol- 
lowed here. 
Pilea filicina Killip., sp. nov. 
Plants frutescent, scandent (?), apparently dioecious, pinnately branched 
(branches divaricate, 10 to 20 cm. long), glabrous throughout. Stems and 
branches slightly angulate, faintly winged on the angles. Stipules minute, 
early deciduous. Leaves of a pair dissimilar and unequal, the larger ovate- 
orbicular, 10 to 13 mm. long, 6 to 7 mm. wide, abruptly tapering at base, sessile 
or subsessile, crenate at apex (2 teeth to a side, the apical tooth blunt, 2 mm. 
wide), otherwise entire, penninerved (4 to 6 nerves to a side, one of the pairs 
often conspicuous, extending to the lower of the teeth), the smaller leaves 
broadly orbicular, 4 to 5 mm. long, 5 to 6 mm. wide, sessile, entire or slightly 
undulate at apex, triplinerved; both kinds of leaves dark green (nearly black 
when dry) and faintly marked with linear cystoliths (especially near margin) 
on upper surface, paler and copiously covered with minute punctiform cysto- 
liths beneath. Pistillate heads subglobose, minute, 1 to 1.5 mm. wide, 3 or 
4-flowered, sessile or very short-petioled; perianth divisions unequal, the 
middle 0.8 mm. long, the lateral 0.3 mm. long; achenes broadly ovate, 1 mm. 
long, 0.8 mm. wide. 
Type in the U.S. National Herbarium, no. 1,124,280, collected at Paime, 
Department of Cundinamarca, Colombia, in 1921, by Brother Ariste-Joseph 
(no. A927). 
The venation, markings, and coloration of the leaves of this species indicate 
a relationship with P. dendrophila Miq., but the much smaller leaves, the 
larger kind being much rounder, and its habit of growth and branching 
clearly show that it is distinct. From P. trichosanthes Wedd., to which also 
it is allied, it is distinguishable by its more orbicular, nearly sessile, longer 
leaves which are only faintly marked with cystoliths, and by its more abun- 
dant, divaricate branches. 
Pilea hazeni Killip, sp. nov. 
Climbing herb, monoecious (?), glabrous throughout. Stripules ovate- 
orbicular, 4 mm. long, cordate at base, chartaceous, ight brown. Leaves 
dark green above, bearing fusiform and linear cystoliths, light green beneath 
with more conspicuous fusiform cystoliths, 3-nerved to upper third of blade; 
leaves of a pair unequal and dissimilar, the larger ovate-lanceolate, 3 to 4.5 
em. long, 1.5 to 2 em. wide, short-acuminate at apex, rounded, subcordate, or 
subecuneate at base, crenate-serrate (teeth averaging 9 to a side), their 
petioles 1 to 2 cm. long, the smaller leaves nearly orbicular in general 
outline, 1 to 1.8 em. long, 1.5 to 2 cm. wide, abruptly acute at apex, rounded 
or subtruncate at base, crenate-serrate (teeth averaging 6 to a side), their 
petioles5to7mm.long. Staminateheadsnotseen. Pistillate heads cymose, 
borne in two’s or three’s in the axils of the upper leaves, the cymes 3 to4mm. 
wide, the peduncles 4 to 5 mm. long; achenes ovate. 
