Vor. II.] MAPLE FAMILY. 399 
6. Acer glabrum Torr. Dwarf or Rocky 
Mountain Maple. (Fig. 2377.) 
Acer glabrum Torr, Ann. Lyc. N. Y. 2: 172. 1826. 
Acer tripartitum Nutt.; T. &. G. Fl. N. A. & 247° 
1838. 
A shrub, or small tree, with maximum height of 
about 35° and trunk diameter of 12’. Leaves 1/- 
3/ long, often broader, glabrous on both sides, or 
puberulent when young, 3-5-lobed, the lobes acute 
or obtusish, sharply serrate, the sinuses acute; 
flowers yellowish green, in numerous small lateral 
and terminal sessile corymb-like racemes; pedicels 
short, glabrous, erect or ascending; samaras gla- 
brous, shining, 9’’-15’’ long, little diverging; wing 
4/’-6/ wide. 
Borders of streams and hillsides, northwestern Ne- 
braska and throughout the Rocky Mountain region, 
south to Arizona, west to the Sierra Nevada and Brit- 
ish Columbia. Wood hard, light brown, Weight per 
cubic foot 37 lbs. May. 
7- Acer Pennsylvanicum I. Striped or 
Goosefoot Maple. Moosewood. (Fig. 2378.) 
Acer Pennsylvanicum I, Sp. Pl. 1055. 1753. 
Acer striatum Du Roi, Diss. Inaug. 58. 1771. 
A small tree, with maximum height of about 35° 
and trunk diameter of about 8’, the smoothish green 
bark striped with darker lines. Leaves large, often 
6/-8’ long, broadest above the middle, thin, glabrous 
above, sparingly pubescent beneath when young, 
slightly cordate or truncate at the base, finely serrate 
or serrulate all around, 3-lobed near the apex, the 
lobes short and acuminate to a long tip; racemes 
terminal, narrow, drooping, 3/—4’ long; flowers green- 
ish yellow, 3/’-4’’ broad; unfolding after the leaves; 
petals obovate; samaras glabrous, 1’ long, widely di- 
vergent, the wing 4’/-5’’ wide. 
In rocky woods, Nova Scotia to Lake Superior, south, 
especially along the mountains to Georgia, and Tennessee. 
Called also False or Striped Dogwood and Whistle-wood. 
Wood soft, satiny, light brown; weight per cubic foot 33 lbs. 
Ascends to 5000 ft. in North Carolina. May-June. 
8. Acer spicatum Tam. Mountain Maple. 
(Fig. 2379.) 
Acer spicatum Yam. Encycl. 2: 381. 1786. 
Acer montanum Ait. Hort. Kew. 3: 435. 1789. 
A shrub, or rarely a small tree, with maximum height of 
about 30° and trunk diameter of 8’,the bark green, not striped. 
Leaves 3/-5’ long, glabrous above, pubescent beneath, at 
least when young, 3-5-lobed, coarsely serrate, lobes acute or 
acuminate; racemes compound, erect, rather dense; flowers 
1/’-1'4” broad, greenish yellow, unfolding after the leaves; 
petals linear-spatulate; samaras 9//-10’’ long, somewhat di- 
vergent, the wing 3/’-4’’ wide. 
Damp rocky woods, Newfoundland and James’ Bay to Manitoba, 
south, especially along the mountains, to North Carolina, Ten- 
nessee and Minnesota. Wood soft, light reddish brown; weight 
per cubic foot 33 lbs. Ascends to 5000 ft. in North Carolina, 
May-June. 
