It is also probable that C. Arnoldiana, Sargent, new species, has been collected in Massachusetts as C. mollis. It differs from C. submollis "in its broader, darker green, more villose leaves which are usually rounded, not cuneate at the base, in its smaller flowers, subglobose, not oblong or pear-shaped, crimson fruit with smaller spreading calyx lobes, borne on shorter peduncles and ripening two or three weeks earlier, and by its much more zigzag and more spiny branches, which make this tree particularly noticeable in winter, when it may readily be recognized from all other thorn trees."—C. S. Sargent in Bot. Gaz., XXXI, 223, 1901.
DRUPACEÆ. PLUM FAMILY.
Trees or shrubs; bark exuding gum; bark, leaves, and especially seeds of several species abounding in prussic acid; leaves simple, alternate, mostly serrate; stipules small, soon falling; leafstalk often with one to several glands; flowers in umbels, racemes, or solitary, regular; calyx tube free from the ovary, 5-lobed; petals 5, inserted on the calyx; stamens indefinite, distinct, inserted with the petals; pistil 1, ovary with 1 carpel, 1-seeded; fruit a more or less fleshy drupe.
Prunus nigra, Ait.
Prunus Americana, var. nigra, Waugh.
Wild Plum. Red Plum. Horse Plum. Canada Plum.
Habitat and Range.—Native along streams and in thickets, often spontaneous around dwellings and along fences.
From Newfoundland through the valley of the St. Lawrence to Lake Manitoba.