Amelanchier alnifolia var. pumila

(Torrey & A. Gray) C. K. Schneider

Ill. Handb. Laubholzk. 1: 739. 1906.

Common names: Dwarf shadbush
Endemic
Basionyms: Amelanchier canadensis var. pumila Torrey & A. Gray Fl. N. Amer. 1: 474. 1840
Treatment appears in FNA Volume 9. Treatment on page 652. Mentioned on page 651.

Shrubs, 1–2 (–4) m. Stems 1–50, solitary or in colonies. Leaves: petiole (7–) 11.9–19.1 (–27) mm; blade orbiculate to oval, (14–) 26–37 (–50) × (18–) 23–36 (–43) mm, base usually cordate to truncate, sometimes ± cuneate, apex rounded or subtruncate, surfaces glabrous. Inflorescences (6 or) 7–9 (–12) -flowered, (24–) 29–40 (–47) mm. Pedicels proximalmost (8–) 10–20 (–27) mm. Flowers: sepals (2.7–) 3.2–4 (–4.5) mm; petals obovate to elliptic, (9–) 10.9–11.5 (–12.6) × (3–) 3.8–5.2 (–5.9) mm; ovary apex glabrous (or sparsely hairy with a ring of hairs at base of styles). Pomes 8–9 mm diam. 2n = 4x.


Phenology: Flowering May–Jun; fruiting Jul–Sep.
Habitat: Mountain slopes
Elevation: 2000–3400 m

Distribution

V9 1120-distribution-map.jpg

Ariz., Calif., Colo., Utah, Wyo.

Discussion

The most distinctive features of var. pumila are that its leaves, pedicels, sepals, and ovary apices are glabrous (with the exception of a few hairs on emerging leaves and a ring of hairs around the base of the styles in some plants), and its leaf teeth are relatively long and sharp-pointed. This variety appears to be restricted to higher elevations.

Selected References

None.

Lower Taxa

None.

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 +
(Torrey & A. Gray) C. K. Schneider +
fissuring in older trees +  and smooth +
salmon colored +, brown +  and gray +
compound +  and simple +
opposite +  and alternate +
cuneate +, usually cordate +  and truncate +
Amelanchier canadensis var. pumila +
3.7 cm37 mm <br />0.037 m <br /> (5 cm50 mm <br />0.05 m <br />) +
3.6 cm36 mm <br />0.036 m <br /> (4.3 cm43 mm <br />0.043 m <br />) +
2.6 cm26 mm <br />0.026 m <br /> (3.7 cm37 mm <br />0.037 m <br />) +
orbiculate +  and oval +
membranous +  and coriaceous +
23mm +  and 36mm +
adnate +  and connate +
Dwarf shadbush +
Ariz. +, Calif. +, Colo. +, Utah +  and Wyo. +
not +  and aggregated +
2000–3400 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 />) +
Mountain slopes +
glabrous +  and hairy +
7-9(-12)-flowered +
4 cm40 mm <br />0.04 m <br /> (4.7 cm47 mm <br />0.047 m <br />) +
nodding +, spreading +, drooping +, erect +, ascending +  and arching +
2.9 cm29 mm <br />0.029 m <br /> (4 cm40 mm <br />0.04 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 cm20 mm <br />0.02 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
proximalmost +
2 +  and 1 +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
1.15 cm11.5 mm <br />0.0115 m <br /> (1.26 cm12.6 mm <br />0.0126 m <br />) +
0 (?) +  and 4 (?) +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.59 cm5.9 mm <br />0.0059 m <br />) +
Pink (?) +, Ivory (?) +  and White (?) +
free +  and distinct +
1.09 cm10.9 mm <br />0.0109 m <br /> (1.15 cm11.5 mm <br />0.0115 m <br />) +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
1.91 cm19.1 mm <br />0.0191 m <br /> (2.7 cm27 mm <br />0.027 m <br />) +
1.19 cm11.9 mm <br />0.0119 m <br /> (1.91 cm19.1 mm <br />0.0191 m <br />) +
Flowering May–Jun +  and fruiting Jul–Sep. +
adnate +, free +, connate +  and distinct +
purple +  and black +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
2 cm20 mm <br />0.02 m <br /> (2.9 cm29 mm <br />0.029 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Ill. Handb. Laubholzk. +
4-17-flowered +
not arillate +
0.4 cm4 mm <br />0.004 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
persistent +
free +  and distinct +
erect +  and recurved +
triangular +  and lanceolate +
0.32 cm3.2 mm <br />0.0032 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
free +  and distinct +
branched +  and simple +
colonial +  and solitary +
erect +  and ascending +
1 +  and 50 +
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. pumila +
Amelanchier alnifolia +
variety +
0 +  and 3 +
inconspicuous +