Tree above medium in size, vigorous, vasiform, open-topped, semi-hardy, variable in productiveness; branches smooth except for the numerous, small, raised lenticels, somewhat thorny, dark ash-gray, the fruit spurs numerous; branchlets willowy, of medium thickness and length, with short internodes, greenish-red changing to light brown, shining, glabrous; lenticels numerous, small; leaf-buds small, short, obtuse, plump, free. Leaves sparse, folded upward, oblanceolate or narrowly obovate, one and three-quarters inches wide, three and one-half inches long, thin; upper surface glabrous except for scattering hairs, with a grooved midrib; lower surface light green, glabrous except along the midrib and larger veins; apex acute or abruptly pointed, base acute, margin finely serrate or crenate, eglandular; petiole nine-sixteenths inch long, slender, tinged red, glandless or with from one to four globose or reniform, greenish-yellow glands on the stalk. Blooming season early and of medium length; flowers appearing before the leaves, white; borne in thin clusters on lateral buds and spurs, singly or in pairs; pedicels long, glabrous, greenish; calyx-tube green, campanulate, glabrous; calyx-lobes obtuse, with numerous hair-like glands, nearly glabrous, erect; petals roundish-ovate, entire, not clawed; anthers yellowish; filaments short; pistil glabrous except at the base, much longer than the stamens. Fruit early, season short; one and three-quarters inches in diameter, roundish, halves equal; cavity of medium depth and width, abrupt, regular; suture a line; apex roundish; color light or greenish-yellow, more or less blushed with red on one side, becoming red at maturity, mottled, with thin bloom; dots numerous, small, whitish, conspicuous only where the skin is blushed; stem slender, five-eighths inch long, glabrous, detaching easily from the fruit; skin thin, tough, adhering; flesh yellowish, very juicy, fibrous, tender, melting next the skin but firmer at the center, sweet except near the pit; good in quality; stone adhering, three-quarters inch by five-eighths inch in size, roundish-oval, flattened, blunt but with a small, sharp tip, rough; ventral suture narrow and rather conspicuously winged; dorsal suture grooved. HAMMER [Illustration: HAMMER] _Prunus hortulana mineri_ × _Prunus americana_ =1.= _Cornell Sta. Bul._ =38=:79. 1892. =2.= _Ia. Hort. Soc. Rpt._ 275, 448. 1893. =3.= _Ibid._ 334. 1894. =4.= _Wis. Sta. Bul._ =63=:24, 39. 1897. =5.= _Colo. Sta. Bul._ =50=:36. 1898. =6.= _Ia. Sta. Bul._ =46=:274. 1900. =7.= _Waugh Plum Cult._ 150. 1901. =8.= _Ont. Fr. Gr. Assoc._ 144. 1901. =9.= _Ga. Sta. Bul._ =67=:274. 1904. =10.= _S. Dak. Sta. Bul._ =93=:18. 1905. =11.= _Ohio Sta. Bul._ =162=:254, 255. 1905.