136 S. Watson—Poplars of North America. 
and extensively planted in Utah, but the wood considered 
worthless, 
+t t Capsule tomentose, three-valved. 
6. P. trichocarpa Torr. and Gray. Leaves broadly ovate, 
acuminate, cordate, often whiter beneath with age, puberulent 
when young; petioles one or two inches long: rhachis pubes- 
villous: pedicels a line or two long.—S. California to W. 
Nevada and British Columbia. 
* * Leaves deltoid, sinuate-crenate ; petioles flattened: sta- 
mens sixty or more: seed one and one-half or two lines long: 
capsule three or four-valved : rhachis and disk glabrous. 
7. P. monilifera Ait. Leaves with numerous serratures and 
narrow very acute acumination, broadly truncate-deltoid, some- 
times ovate, rarely cordate; petioles two to four inches long: 
ament usually long (two to seven inches): disk rarely two 
lines broad: capsules rather thin, oblong-ovate, four or five 
lines long, on slender pedicels one to five lines long.—New 
England to Florida, Louisiana,-and the base of the Rocky 
Mountains in Colorado and Wyoming. Most flowering and 
fruiting specimens seen from east of the Mississippi have four, 
rarely three, distinct styles and a four-valved capsule; a single 
a peltate stigma, and the capsule three-valved. The more 
western specimens have all three distinct styles and a three- 
valved capsule. ere are no apparent differences otherwise, 
and it remains to be seen whether these forms can be specilic- 
t 
P. Fremonti Watson. Leaves with few serratures (four 
ad aeute 
lines broad, and pedicels eight to ten lines long: pistillate 
a ree ur inches long: disk three lines broad: cap- 
sules ovate, thick-coriaceous, three-valved, on stout pedicels two 
(two to six inches long), the disk two or three lines broad, and 
the somewhat angled capsules three- or usually four-valved, on 
slender pedicels two to eight lines long.—The phat form 
from N. California to S. Utah; the variety from S. California 
to the Rio Grande. 3 
- ze ip 
