SEPT. 19, 1923 | KILLIP: NEW URTICACEAE FROM COLOMBIA 307 
Pilea ornatzfolia is allied to P. flexuosa Wedd., the principal points of differ- 
ence being smaller and proportionately narrower leaves of P. ornatifolia, 
with distinctly cordate bases and inconspicuous cystoliths on the upper 
surfaces, shorter petioles, the much shorter lobes of the staminate flowers, 
and the shorter segments of the perianth of the pistillate flowers. 
Pilea pennellii Killip, sp. nov. 
Plants monoecious, slender, branching near the base, 25 to 30 em. high, 
glabrous throughout. Stipules triangular, barely 1 mm. long, acute. Petioles 
5 to 8 mm. long, those of a pair slightly unequal. Leaf blades narrowly 
ovate-oblong, 2 to 3 cm. long, 0.8 to 1.5 cm. wide, acuminate at apex, tapering 
at base, minutely serrulate (teeth acute, imbricate, often cartilaginous at 
margin), 3-nerved (lateral nerves reaching to the upper quarter of the blade), 
light green on both surfaces, above copiously covered with punctiform and 
very minute linear cystoliths, beneath punctate with dark ocellae but almost 
destitute of cystoliths. Staminate heads globose, 5 to 6 mm. in diameter, 
purplish white, borne on slender peduncles 3 cm. long, the perianth lobes 
barely 0.1 mm. long. Pistillate flowers in closely flowered cymes, subsessile 
or with peduncles up to 3 mm. long, the segments unequal, the middle 0.7 
mm. long, the lateral 0.4 mm.; achenes ovate, 0.5 mm. long. 
Type in the U. 8. National Herbarium, no. 1,140,923, collected in a forest 
along the Rio San Rafael, below Cerro Tatamd Department of Caldas, 
Colombia, altitude 2,200 to 2,500 meters, September 7 to 11, 1922, by F. W. 
Pennell (no. 10326). ’ 
This species apparently is nearest P. flexuosa Wedd., differing in its smaller, 
closely serrulate leaves, and in its cystoliths. The light green aspect of the 
plant suggests P. cuprea Krause, but in that species the pistillate heads as 
well as the staminate are long-peduncled. 
Pilea rhombifolia Killip, sp. nov. 
Plants 20 to 30 cm. high, glabrous throughout. Stipules ovate, 2 to 3 mm. 
long.: Petioles 0.5 to 1.5 em. long. Leaves of a node similar in shape, 
subequal in size, rhombic or broadly ovate, 2 to 4.5 em. long, 1.5 to 3 cm. wide, 
short-acuminate at apex, cuneate or subrotund at base, crenate-serrate above 
the base (6 to 7 teeth on a side), 3-nerved (nerves reaching to upper third of 
blade), subcoriaceous, dark green, slightly lustrous above, silvery-white 
beneath, copiously covered on upper surface with linear and fusiform cysto- 
liths on lower surface confined mainly to the nerves. Pistillate head in cymes 
1 cm. wide or less, the peduncles 0.5 to 1 em. long; schenes ovate, 1 mm. long. 
Type in the U.S. National Herbarium, no. 533,540, collected near Santa 
Marta, Colombia, altitude 1,750 meters, by H. H. Smith (no. 1446). A 
specimen of this collection is also in the herbarium of the Academy of Natural 
Sciences, Philadelphia. 
This species is allied to P. sesszliflora Wedd. and P. radicans Wedd., differing 
from the former in its relatively broader leaves with larger teeth and more 
abundant cystoliths, and from the latter in its larger, thicker leaves and erect 
habit. 
Pilea purpurea Killip, sp. nov. 
Stems erect, 40 to 60 em. high, angulate, glabrous below, slightly pubescent 
above. Petioles 1.5 to 3 cm. long, ferruginous-tomentose, becoming glabrate. 
