334 DRUPACEAE 
Drupes smooth, with a bloom on the skin, stone more or less flattened. 
PLUMS 
Leaves egg-shaped. 
Fruit red, leaves and calyx-lobes glandular . . . P. nigra 
Fruit yellow, leaves and calyx-lobes not glandular P. americana 
Leaves narrow, lance-shaped . . .. . . . . P. angustifolia 
Shrubs. 
Leaves Jance-shaped . . . « - «5 *« = « « P allezghanvensis 
Weaves ‘elliptic: ..) “si 0 a Ry Oe Vs ace OE i ee te enracenas 
Leaves rounded . iu eee Ae ts) CPA Gre eae 
Leaves pear-shaped; branches thorny — 5 . P. spinosa 
Drupes smooth, without bloom on the skin, stone smooth, “globular. 
CHERRIES 
Shrubs, 4 to 4 ft. high. 
Stems prostrate or reclining; leaves pointed at each end . P. pumila 
Stems erect; leaves rounded at ane’ a eee) lee barre 25 cuneata 
suoveeN) ZY ike) aye AR Io G oa og a 6 < «© « « « « FP. wirgemonn 
Trees 20 to 7o ft. high. 
Brut) “black pis iseeciuec-y oo. ot joel fe nS P. serotina 
BrGit sredt ie ee) Soe Loe wes Chee Bee a pennsylvanica 
PLUMS 
l. P. nigra, Ait. (Fig. 7, pl. 73.) Horst Prum. Tree, sometimes 
30 ft. high, Leaves egg-shaped, rounded at base, tapering in a lengthened ° 
point at apex, about 1 in. broad. Fruit egg-shaped, about an in. long, 
red. Woods and thickets. May. 
2. P. americana, Marshall. (Fig. 9, pl. 73.) Witp YretLtow or Rep 
PLuM. Tree, sometimes 35 ft. high, generally, however, about 15 to 20 
ft. Branches somewhat thorny. Leaves directly or inversely egg-formed, 
with the apex conspicuously taper-pointed, and the borders coarsely or 
doubly serrate; base rounded. Fruit rounded, ? to 1 in. in diameter, 
orange or red. Stone flattened. The pulp of the fruit has a pleasant 
taste, the skin tough and acrid. Woods and river banks. Blooms April 
to May. 
3. P. angustifolia, Michx. Cuickasaw Prum. Tree or shrub, 8 to 
15 ft. high. Branches searcely thorny. Leaves narrow lance-form with 
both ends tapering, or less frequently with base somewhat rounded, ser- 
rations not coarse, Fruit round, 4 to $ in. diameter, red. Stone nearly 
globular. Southern part of our region only. 
4. P. alleghaniensis, Porter. Porter’s PruM. Low straggling shrub 
or small tree, seldom thorny. Leaves egg-shaped to lance-shaped with 
sharp teeth at the margins; apex ‘slender tapering. Flowers in an 
elongated cluster. Fruit globose or egg-shaped. Eastern Conn. Across 
the Alleghany mountains to Pa, April. 
5. P. maritima, Wang. (Fig. 8, pl. 73.) Bracn Prum. Shrub, 1 
to 7 ft. high, straggling, growing on sandy sea beaches. Leaves egg- 
shaped or pear-shaped. Fruit about 4 in. diameter, purple, sweet. 
6. P. Gravesii, Small. (Fig. 10, pl. 73.) Gravr’s Breach PiuM. 
Leaves round or slightly oval. Fruit smaller than No. 4. Rare. Groton, 
Conn. 
7. P. spinosa, L. (Tig. 4, pl. 73.) Stor, Buckrnorn. Although 
not native is sometimes found along roadsides. Shrub, 2 to 10 ft. high. 
It has egg-shaped leaves, pointed at each end, branches thorny. Flower 
clusters consisting of one or two blossoms, Fruit nearly black. 
