Amelanchier alnifolia var. semiintegrifolia

Many-flowered shadbush

Description Shrubs or small trees. Stems 1–20, 1–12 m, solitary or in small clumps ; twigs glabrous at flowering. Leaves conduplicate in bud;usually unfolded and fully expanded, green, abaxially finely (densely) hairy by flowering; petioles 10–25 mm; blades abaxially pale green, oblong to suborbiculate, 3–4 x 2–3 cm, firm, bases rounded or subcordate, margins dentate mostly in distal 1/2 with 4–6 teeth per cm (entire), lateral veins 8–12 pairs, remaining distinct to the margin and not anastomosing , apices subtruncate to rounded or acute, surfaces glabrous. Inflorescences 5–15-flowered, erect, 4–8 cm, only proximalmost pedicel subtended by leaf. Pedicels hairy, proximalmost 0.8–1.4 cm. Flowers: hypanthia campanulate, 4–5 mm diam.; sepals recurved after flowering , 2–2.5 mm, hairy adaxially; petals white, oblanceolate, 12–15 x 2–3.5 mm, not andropetalous; stamens (12–15 )20; styles (4–)5; ovary summit rounded, densely hairy (glabrous). Pomes purplish black and glaucous, 10–13 mm diam., sweet. 2n = 68.

Flowering/Fruiting
Flowering Mar–Jun; fruiting Jun–Aug.

Habitat
Woods, hillsides, roadsides, mountainsides; 0–2100m

Range
B.C.; Alaska, Calif., Oreg., Wash.

Discussion
Amelanchier alnifolia var. semiintegrifolia is most similar to A. alnifolia var. alnifolia, and one can distinguish these two varieties by petal length. It tends to grow relatively close to the Pacific Ocean. The discussion under A. alnifolia has more about the relationships of these two varieties.