Amelanchier alnifolia var. semiintegrifolia

(Hooker) C. L. Hitchcock in C. L. Hitchcock et al.
in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 3: 94. 1961.
Common names: Many-flowered shadbush
Endemic
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

Distribution

V9 1119-distribution-map.jpg

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

Discussion

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

Selected References

None.

Lower Taxa

None.

Christopher S. Campbell +, Michael B. Burgess +, Kevin R. Cushman +, Eric T. Doucette +, Alison C. Dibble +  and Christopher T. Frye +
(Hooker) C. L. Hitchcock in C. L. Hitchcock et al. +
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 +