328 POMACEAE 
eurved prickles. Leaflets with doubly serrated borders, resinous and very 
aromatic beneath. Dry pastures. June-July, 
Famity VIII.—POMACEAE, Appts Famity 
Trees or shrubs. Leaves alternate, simple or compound (feather- 
formed). Flowers regular, sepals and petals generally 5 each. 
Stamens numerous (rarely few). Ovary 1- to 5-celled, most fre- 
quently 5. Fruit consists of a wall or walls of stiff parchment-like 
texture or of a more woody structure which encloses the seeds 
and of a fleshy substance which envelopes the 5 or less seed caskets 
and their contents. 
Shrubs and trees armed with thorns . . . . . Crataegus 
Shrubs and trees without thorns. 
Leaves compound (feather-formed) . . . . . Sorbus 
Leaves simple. 
Fruit usually more than an inch in diameter. 
Flowers usually white; flesh with gritty cells Pyrus 
Flowers mostly pink; flesh without gritty cells 
Be ao | lest Maka Sata le WD aR. clk cakes Nt ta 
Fruit small, less than 4 in. in diameter. 
Seed cells partially or completely doubled. 
Small trees ... 9.) .. « . Amelanchrer 
Seed cells not doubled. 
Dow ‘shrubs. °.. Aee se Sp 
1, SORBUS, FE: 
Trees or shrubs, with compound leaves with about 10 to 16 leaflets 
arranged on the sides of the leaf-stalk, and with an odd terminal leaflet. 
Flowers in a compact, terminal, nearly flat cluster. Fruit small, berry- 
like, red. 
1. §. americana, Marsh. (Fig. 1, pl. 71.) AMERICAN MOUNTAIN 
AsH. (Pyrus americana, (Marsh.) DC.). Small trees, reaching a height 
of 50 ft. Leaflets 11 to 17, narrow, lance-shaped with tapering points, 
without hairs, above or below, except when young. Berries as large as 
peas, red when ripe. Swamps and mountain woods, mostly in northern 
half of our area. 
2. §. sambucifolia, (A. Gray.) Roem. WESTERN MountTAIN ASH. 
(Pyrus stitchensis, (Roem.) Piker.) Leaflets 7 to 15, oblong or oval, to 
lance-shaped; less tapering at points than those of No. 1, and usually 
clothed with soft hairs beneath. Fruit larger than that of No. 1. North- 
ern New England and northward. 
2. PYRUS,, ©. 
Trees, sometimes shrubs, with simple leaves. Flowers white or pink, 
