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82 TREES AND SHRUBS 

Salix triandra, Zizn@us. THREE-STAMENED WILLOW. (Salix. Villar- 
siana, Fluggi, and in gardens.) European shrub or small tree with lance- 
shaped, round-based, shining leaves, and slender flower-clusters 2 to 3 inches 
long; stamens 3. 
SAPINDACE. Soapberry Family. 
Trees or shrubs; leaves compound or lobed; stamens usually not twice as 
many as the petals, but when just as many then inserted alternate with 
them; disk on which the petals are inserted lines the bottom of the calyx; 
ovary 2- to 3-celled, with I to 3 or several ovules in each cell. An order not 
specially characterized by active properties, though of some importance in 
the arts. 
Acer. Marie. Trees with lobed leaves and a 2-seeded, 2-winged fruit. 
Sexes more or less separated functionally. 
Acer campestre, Ziznz@us. COMMON ENGLISH MAPLE. A middle-sized 
tree with leaves 2 to 3 inches across, and with about 5 broad, blunt lobes. 
Mature fruit downy, and wings diverging so as to enclose no angle,—z.e., 
straight out. Hardy here. There is a variegated form in the grounds. 
Acer dasycarpum, Z/rhart. WHITE or SILVER MAPLE. A fair-sized 
native tree; flowers without petals, coming before the deeply 5-lobed gash- 
toothed leaves, which are whitish on the under surface; young fruit hairy, 
wings large, diverging. There are pendulous and cut-leaved varieties of this 
species. 
Acer macrophyllum, Pursh. SorrT MAPLE, BROAD-LEAVED MAPLE. 
Large tree of our Pacific coast. Large heart-shaped leaves deeply 3- to §-lobed, 
with the lobes again sharply cut; stamens 9 or 10, with hairy filaments; body 
of fruit densely hairy. A most valuable timber tree, and for some purposes 
the best substitute for hickory the Western coast furnishes. 
Acer obtusatum, <A?fazde/, OBTUSE-LEAVED MAPLE. From the dry 
mountains of Hungary and Croatia. Heart-shaped leaves with 5 obtuse lobes, 
velvety on the under surface ; wings of the fruit not widely diverging. 
* Acer Pennsylvanicum, Zizuz@us. MoosE-Woop, STRIPED DoGwoop. 
A slender native tree with drooping greenish flowers appearing after the leaves, 
which (the leaves) are 3 lobed, sharply double-toothed; fruit with large 
spreading wings; bark green faintly or strongly striped with lighter lines. 
Known in grounds often as A. striatum, Lambert. 
Acer platanoides, Z7zz@us. Commonly called NoRWAY MAPLE. Euro- 
pean tree, introduced here; broad, thin, smooth leaves with 5 lobes which 
are conspicuously sharply-toothed, appearing before the flowers; stamens 5 or 
more; juice milky. Wings of fruit 2 inches long. This species has produced 
the varieties dissectum, with deeply-cut leaves, and laciniata, with the leaf- 
lobes resembling claws. 
Acer polymorphum, 7iwnderg. A Japanese species of recent introduc- 
tion. Said to be hardy here, and promising to become with us a fair-sized 
tree, it being in some of its varieties in its own country a dwarf. The Park 
has on trial 4 varieties: of these, dissectum, palmatum, and septemlobum 
were once regarded as distinct species, 

