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
Synonyms: A. florida humptulipensis
Basionyms: Amelanchier ovalis semiintegrifolia
Found 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

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.

References

None.

AuthorChristopher S. Campbell +, Michael B. Burgess +, Kevin R. Cushman +, Eric T. Doucette +, Alison C. Dibble + and Christopher T. Frye +
BasionymAmelanchier ovalis semiintegrifolia +
Common nameMany-flowered shadbush +
Elevation0–2100 m +
HabitatWoods, hillsides, roadsides, mountainsides +
IllustratorMarjorie C. Leggitt +
PhenologyFlowering Mar–Jun + and fruiting Jun–Aug. +
ReferenceNone +
SynonymA. florida humptulipensis +
Taxon nameAmelanchier alnifolia var. semiintegrifolia +
Taxon parentAmelanchier alnifolia +
Taxon rankvariety +
VolumeVolume 9 +