1894. ] Undescribed Plants from Guatemala. II 
phous and very unequal in the pair; the larger lanceolate to 
rhomboid-elliptical (18-36 6-10'), tapering each way from 
middle, apex obtuse, base acutely narrowed into short (2-3') 
petiole; the smaller obovate or rhomboid-orbicular, apex 
rounded, base acute, petiolate: dicecious; pistillate cymes (the 
only seen) not exceeding petiole of larger leaves, pedunculate, 
divaricate, flowers pedicellate, interior segment of perianth 
subequalling the others and minutely cucullate, twice ex- 
ceeded bystaminodes, half as long as obliquely oval (0.75') and 
pubescent achenium.—Nearest to P. dendrophila Mig.—On 
decayed mossy trunks of trees, Pansamald forest, Depart. 
Alta Verapaz, alt. 3,800", June 1886, von Tiirckheim, no. 939. 
Pilea riparia. — Stem repent, elongate, ligneous, simple 
branches ascending (6-12™): stipules minute, deltoid; leaves 
glabrous, thick, subentire, 3-nerved from*base to middle on 
upper surface and nearly to apex on reticulated lower surface; 
the larger in the pair oblong-elliptical (3.5-4x 1.75"), long- 
acuminate, tapering gradually to short (2-4') petiole; the 
other a fourth smaller, obovate-elliptical, abruptly acuminate; 
cystoliths of upper surface densely stellulate-punctiform, of 
lower minutely linear, of margins large and fusiform: dice- 
cious; staminate cymes not seen; the pistillate pedunculate, 
little exceeding petiole, divaricate, interior segment of peri- 
anth lightly gibbous on back and scarcely exceeding the oth- 
ers, staminodes as long, oval achenium thrice longer (0. 5’) 
and smooth.—Nearest to P. marginata Wedd.—Specimens 
of this, as well as also of the other proposed new species ex- 
cept P. irrorata, have been compared by Dr. Taubert in the 
Berlin Herbarium. Iam likewise indebted to him for the 
identification of several other Pilee, difficult of determination 
without the aid of authenticated material.2-On rocks in a 
stream, Pansamald, alt. 3,800°, August 1886, von Tiirck- 
heim, no. 1,040. 
Pilea irrorata. — Herbaceous; stem shortly rooting at 
base, stout, simple or forked (1-2"): stipules elongate-trian- 
gular (2-3'), persistent; petioles long (1.5-3.5"), canaliculate, 
dilated at base and apex; leaves membranaceous, smooth, 
ample (6-9 x 2-4"), elliptical, caudate-acuminate, obtuse, base 
acuminate, the opposite uniform and nearly equal, sinuate- 
serrulate above middle, 3-nerved from insertion to apex,. 
transverse veins distinct and subparallel, above punctulate 
and toward base lineolate, cystoliths scarcely present beneath: 
