Common names: Cusick’s shadbush
Endemic
Synonyms: Amelanchier alnifolia var. cusickii (Fernald) C. L. Hitchcock A. basalticola Piper
Treatment appears in FNA Volume 9. Treatment on page 652. Mentioned on page 649.

Shrubs, 2–8 m. Stems 1–50, solitary or in colonies. Leaves fully unfolded; petiole (9–) 12.8–19 (–28) mm; blade elliptic to suborbiculate, (22–) 33–46 (–61) × (13–) 25–32 (–50) mm, base subcordate to truncate, each margin with (0 or) 1–6 (–11) teeth on proximal 1/2 and (2–) 4 or 5 (–7) teeth in distalmost cm, largest teeth 1 mm, apex usually truncate, sometimes mucronate to acute, abaxial surface glabrous or sparsely hairy by flowering, glabrous (or sparsely hairy) later, adaxial glabrous later. Inflorescences (4–) 6–8 (–10) -flowered, (17–) 26–36 (–47) mm. Pedicels: (0 or) 1 or 2 subtended by a leaf, proximalmost (4–) 9–14 (–18) mm. Flowers: sepals erect to recurved after flowering, (2.6–) 3.3–4.3 (–5.3) mm; petals obovate to oblanceolate, (10.8–) 13.3–20.1 (–23.2) × (2.3–) 3.3–6.3 (–7.5) mm; stamens (14–) 18–20 (–21); styles (4 or) 5, (1.7–) 2.6–4 (–4.8) mm; ovary apex glabrous or sparsely hairy (or with a ring of hairs at base of styles). Pomes bluish black, 10 mm diam. 2n = 4x.


Phenology: Flowering Mar–Jul; fruiting May–Aug.
Habitat: Basaltic ledges, cliffs, and bluffs along streams, stony soil, streambeds, stream banks, copses, mountainsides, roadsides
Elevation: 600–2300 m

Distribution

V9 1121-distribution-map.jpg

B.C., Idaho, Mont., Oreg., Wash.

Discussion

Amelanchier cusickii has distinctively long petals. Leaves that are glabrous upon expanding and glabrous or sparsely hairy ovary apices are also useful for identification. The species flowers before A. alnifolia, which suggests that the two are genetically distinct. G. N. Jones (1946) noted that A. alnifolia and A. cusickii frequently grow together and that there is no evidence of hybridization; the authors have observed hybridization between A. alnifolia var. semiintegrifolia and A. cusickii.

Selected References

None.

Lower Taxa

None.
... more about "Amelanchier cusickii"
hairy +  and glabrous +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
glabrous +  and hairy +
Christopher S. Campbell +, Michael B. Burgess +, Kevin R. Cushman +, Eric T. Doucette +, Alison C. Dibble +  and Christopher T. Frye +
Fernald +
fissuring in older trees +  and smooth +
salmon colored +, brown +  and gray +
compound +  and simple +
opposite +  and alternate +
subcordate +  and truncate +
4.6 cm46 mm <br />0.046 m <br /> (6.1 cm61 mm <br />0.061 m <br />) +
3.2 cm32 mm <br />0.032 m <br /> (5 cm50 mm <br />0.05 m <br />) +
3.3 cm33 mm <br />0.033 m <br /> (4.6 cm46 mm <br />0.046 m <br />) +
elliptic +  and suborbiculate +
? (?) +  and ? (?) +
25mm +  and 32mm +
adnate +  and connate +
Cusick’s shadbush +
B.C. +, Idaho +, Mont. +, Oreg. +  and Wash. +
not +  and aggregated +
600–2300 m +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
purplish +  and nearly black pinkish or maroon-purple dark purple-blue or brownish +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Basaltic ledges, cliffs, and bluffs along streams, stony soil, streambeds, stream banks, copses, mountainsides, roadsides +
glabrous +  and hairy +
(4-)6-8(-10)-flowered +
3.6 cm36 mm <br />0.036 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
nodding +, spreading +, drooping +, erect +, ascending +  and arching +
2.6 cm26 mm <br />0.026 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
crassinucellate +
1 cm10 mm <br />0.01 m <br /> (?) +
deciduous +
pinnate +, dentate +, serrate +  and entire +
toothed +, unlobed +  and lobed +
hairy +  and glabrous +
6-10-loculed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
2 +  and 1 +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
2.01 cm20.1 mm <br />0.0201 m <br /> (2.32 cm23.2 mm <br />0.0232 m <br />) +
0 (?) +  and 4 (?) +
0.63 cm6.3 mm <br />0.0063 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
Pink (?) +, Ivory (?) +  and White (?) +
free +  and distinct +
1.33 cm13.3 mm <br />0.0133 m <br /> (2.01 cm20.1 mm <br />0.0201 m <br />) +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.63 cm6.3 mm <br />0.0063 m <br />) +
1.9 cm19 mm <br />0.019 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
1.28 cm12.8 mm <br />0.0128 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
Flowering Mar–Jul +  and fruiting May–Aug. +
adnate +, free +, connate +  and distinct +
bluish black +
10 cm100 mm <br />0.1 m <br /> (?) +
1.4 cm14 mm <br />0.014 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
4-17-flowered +
not arillate +
0.43 cm4.3 mm <br />0.0043 m <br /> (0.53 cm5.3 mm <br />0.0053 m <br />) +
persistent +
free +  and distinct +
erect +  and recurved +
triangular +  and lanceolate +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
free +  and distinct +
branched +  and simple +
erect +  and ascending +
1 +  and 50 +
0.4 cm4 mm <br />0.004 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
persistent +
connate +  and distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
Amelanchier alnifolia var. cusickii +  and A. basalticola +
Amelanchier cusickii +
Amelanchier +
species +
1 +  and 6 +
inconspicuous +