Endemic
Treatment appears in FNA Volume 9. Treatment on page 651. Mentioned on page 652.

Shrubs, 1–8 m. Stems 1–20, often colonial. Leaves: petiole (5–) 11.7–17.5 (–28) mm; blade usually elliptic to oval to suborbiculate, sometimes quadrangular, (20–) 33–47 (–67) × (14–) 24–36 (–55) mm, base usually subcordate to truncate, sometimes ± tapering, apex usually rounded to truncate, sometimes acute or mucronate, abaxial surface glabrous or sparsely to moderately hairy, adaxial glabrous or sparsely hairy. Inflorescences (4–) 6–11 (–16) -flowered, (8–) 26–43 (–62) mm. Pedicels: proximalmost (5–) 8–16 (–29) mm. Flowers: sepals (1.7–) 2.6–3.6 (–4.9) mm; petals oblanceolate to oval, (5.7–) 9–14 (–18.8) × (2.2–) 3.7–5.1 (–6.6) mm; ovary apex moderately to densely hairy (or glabrous). Pomes 10–15 mm diam. 2n = 4x.


Phenology: Flowering May–Jul; fruiting Jul–Aug.
Habitat: Stream banks and shores, lake shores, mountainsides, dry rocky and grassy slopes (northern shrub-steppe), hillsides, woods, thickets, shaded canyons, moist roadsides
Elevation: 30–2900 m

Distribution

V9 1118-distribution-map.jpg

Alta., B.C., Man., N.W.T., Ont., Sask., Yukon, Colo., Idaho, Iowa, Kans., Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Tex., Utah, Wash., Wyo.

Discussion

Variety alnifolia extends much farther east than any other western shadbush; it is distinguished by its rounded to truncate leaves, hairy ovary apices, and relatively large fruits. The fruits are grown commercially and are an ingredient of the native American food pemmican.

Selected References

None.

Lower Taxa

None.
glabrous or +  and sparsely moderately hairy +
hairy +  and glabrous +
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 +
(Nuttall) Nuttall ex M. Roemer +
fissuring in older trees +  and smooth +
salmon colored +, brown +  and gray +
compound +  and simple +
opposite +  and alternate +
tapering +, usually subcordate +  and truncate +
Aronia alnifolia +
4.7 cm47 mm <br />0.047 m <br /> (6.7 cm67 mm <br />0.067 m <br />) +
3.6 cm36 mm <br />0.036 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
3.3 cm33 mm <br />0.033 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
quadrangular +, usually elliptic +  and oval +
? (?) +  and ? (?) +
24mm +  and 36mm +
adnate +  and connate +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Sask. +, Yukon +, Colo. +, Idaho +, Iowa +, Kans. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.Mex. +, N.Dak. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +  and Wyo. +
not +  and aggregated +
30–2900 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 />) +
Stream banks and shores, lake shores, mountainsides, dry rocky and grassy slopes (northern shrub-steppe), hillsides, woods, thickets, shaded canyons, moist roadsides +
glabrous +  and hairy +
(4-)6-11(-16)-flowered +
4.3 cm43 mm <br />0.043 m <br /> (6.2 cm62 mm <br />0.062 m <br />) +
nodding +, spreading +, drooping +, erect +, ascending +  and arching +
2.6 cm26 mm <br />0.026 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
crassinucellate +
deciduous +
pinnate +, dentate +, serrate +  and entire +
toothed +, unlobed +  and lobed +
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 />) +
1.4 cm14 mm <br />0.014 m <br /> (1.88 cm18.8 mm <br />0.0188 m <br />) +
0 (?) +  and 4 (?) +
0.51 cm5.1 mm <br />0.0051 m <br /> (0.66 cm6.6 mm <br />0.0066 m <br />) +
Pink (?) +, Ivory (?) +  and White (?) +
free +  and distinct +
0.9 cm9 mm <br />0.009 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.37 cm3.7 mm <br />0.0037 m <br /> (0.51 cm5.1 mm <br />0.0051 m <br />) +
1.75 cm17.5 mm <br />0.0175 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
1.17 cm11.7 mm <br />0.0117 m <br /> (1.75 cm17.5 mm <br />0.0175 m <br />) +
Flowering May–Jul +  and fruiting Jul–Aug. +
adnate +, free +, connate +  and distinct +
purple +  and black +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
1.6 cm16 mm <br />0.016 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
Fam. Nat. Syn. Monogr. +
4-17-flowered +
not arillate +
0.36 cm3.6 mm <br />0.0036 m <br /> (0.49 cm4.9 mm <br />0.0049 m <br />) +
persistent +
free +  and distinct +
erect +  and recurved +
triangular +  and lanceolate +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
free +  and distinct +
branched +  and simple +
erect +  and ascending +
1 +  and 20 +
0.29 cm2.9 mm <br />0.0029 m <br /> (0.39 cm3.9 mm <br />0.0039 m <br />) +
persistent +
connate +  and distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
0.2 cm2 mm <br />0.002 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
Amelanchier alnifolia var. alnifolia +
Amelanchier alnifolia +
variety +
0 +  and 3 +
inconspicuous +