Amelanchier alnifolia var. semiintegrifolia

(Hooker) C. L. Hitchcock

in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 3: 94. 1961.

Common names: Many-flowered shadbush
Basionym: Amelanchier ovalis var. semiintegrifolia Hooker Fl. Bor.-Amer. 1: 202. 1832
Synonyms: A. florida var. humptulipensis G. N. Jones
Treatment appears in FNA Volume 9. Treatment on page 652. Mentioned on page 651, 654.

Shrubs or trees, 1–12 m. Stems 1–20, solitary or in colonies. Leaves: petiole (3–)6.8–12.6(–20) mm; blade elliptic to oval to orbiculate, (16–)24–34(–49) × (7–)17–26(–37) mm, base rounded or subcordate, apex subtruncate to rounded or acute, abaxial surface sparsely to moderately hairy, adaxial glabrous or sparsely (moderately) hairy. Inflorescences (4–)6–9(–12)-flowered, (8–)14–26(–35) mm. Pedicels: proximalmost (2–)3–8(–13) mm. Flowers: sepals (1.4–)2.2–3.2(–4) mm; petals oblanceolate to oval, (7.6–)9.9–13.9(–18.2) × (2.6–)3.3–4.7(–6.6) mm; ovary apex moderately to densely hairy (or glabrous). Pomes 10–13 mm diam. 2n = 4x.

Phenology: Flowering Mar–Jun; fruiting Jun–Aug.
Habitat: Woods, hillsides, roadsides, mountainsides
Elevation: 0–2100 m


V9 1119-distribution-map.jpg

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


Variety semiintegrifolia is most similar to and intergrades with var. alnifolia; inflorescences and lowest pedicel lengths distinguish the two.

Selected References


Lower Taxa

Christopher S. Campbell +, Michael B. Burgess +, Kevin R. Cushman +, Eric T. Doucette +, Alison C. Dibble +  and Christopher T. Frye +
(Hooker) C. L. Hitchcock +
Amelanchier ovalis var. semiintegrifolia +
Many-flowered shadbush +
B.C. +, Alaska +, Calif. +, Oreg. +  and Wash. +
0–2100 m +
Woods, hillsides, roadsides, mountainsides +
Flowering Mar–Jun +  and fruiting Jun–Aug. +
in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. +
A. florida var. humptulipensis +
Amelanchier alnifolia var. semiintegrifolia +
Amelanchier alnifolia +
variety +