Amelanchier bartramiana

(Tausch) M. Roemer

Fam. Nat. Syn. Monogr. 3: 145. 1847.

Common names: Mountain shadbush or serviceberry amélanchier de Bartram
Endemic
Basionym: Pyrus bartramiana Tausch Flora 21: 715. 1838
Treatment appears in FNA Volume 9. Treatment on page 657. Mentioned on page 647, 648, 649, 654, 656, 658, 660, 661.

Shrubs, 0.3–2.5 (–5) m. Stems 1–50, fastigiate, suckering and forming ± dense colonies. Leaves half-unfolded; petiole (2–) 4.5–10.5 (–25) mm; blade narrowly elliptic-oval to oblong to broadly oval, (26–) 37–51 (–74) × (12–) 20–29 (–48) mm, base usually cuneate, each margin (2–) 8–14 (–27) teeth on proximal 1/2 and (2–) 7–12 (–21) teeth in distalmost cm, largest teeth less than 1 mm, apex acute to rounded, abaxial surface sparsely (moderately) hairy (or glabrous) by flowering, glabrous or sparsely hairy later, adaxial glabrous (or sparsely hairy) later. Inflorescences (1 or) 2 or 3 (or 4) -flowered, (6–) 13–25 (–38) mm. Pedicels: (0 or) 1 (–3) subtended by a leaf, proximalmost (4–) 11–21 (–35) mm. Flowers: sepals ascending to recurved after flowering, (1.7–) 2.7–3.9 (–6) mm; petals oblong-oval to broadly elliptic, (5.5–) 7.1–8.7 (–16.9) × (2.6–) 3.9–5.3 (–7) mm; stamens (8–) 18–21 (–25); styles (3 or) 4 or 5, (2.7–) 3.8–5.2 (–6.1) mm; ovary apex densely hairy (or glabrous). Pomes dark purple, pear-shaped, 10–15 mm diam. 2n = 2x, 3x, 4x.


Phenology: Flowering May–Aug; fruiting Jul–Sep.
Habitat: Cool woods, mountain slopes, summits, bogs, poor fens, conifer swamps, acidic soil, sandy lake shores, stream banks, rocky ridges, roadside thickets
Elevation: 0–1500 m

Distribution

V9 1130-distribution-map.jpg

St. Pierre and Miquelon, N.B., Nfld. and Labr., N.S., Ont., P.E.I., Que., Maine, Mass., Mich., Minn., N.H., N.Y., Pa., Vt., W.Va., Wis.

Discussion

Amelanchier bartramiana is the only North American Amelanchier with leaves that are imbricate in bud, usually fewer than four flowers per inflorescence, and conic ovary apices (and hence fruits that are more or less pear-shaped rather than globose as in other members of the genus). Because of these differences, P. Landry (1975) placed A. bartramiana in its own subgenus, and all other members of the genus in another. W. H. Blanchard (1907), W. A. Robinson and C. R. Partanen (1980), and Robinson (1982) also recognized the distinctness of this species. Amelanchier bartramiana grows farther north than any other shadbush in eastern North America, and more than other shadbushes, it occupies relatively undisturbed habitats, such as peatlands and natural breaks in mature forests. Some plants in this species produce seed sexually (C. S. Campbell et al. 1987). Sexual plants of A. bartramiana are self-incompatible diploids; a tetraploid individual has been reported (A. C. Dibble et al. 1998); it had relatively large petals and might have been an autotetraploid.

Amelanchier bartramiana usually flowers with A. laevis, and it frequently hybridizes with other members of the genus. M. L. Fernald (1950) and L. Cinq-Mars (1971) reported hybrids with A. arborea (A. ×quinti-martii Louis-Marie), A. canadensis, A. fernaldii, A. gaspensis, A. humilis, A. intermedia, A. laevis, A. sanguinea, A. spicata, and A. interior. The hybrid with A. laevis can usually be found when these two species grow together (J. E. Weber and C. S. Campbell 1989). The authors have documented a hybrid between A. arborea and A. bartramiana in eastern Pennsylvania (M. B. Burgess et al., unpubl.).

Selected References

None.

Lower Taxa

None.
... more about "Amelanchier bartramiana"
glabrous +  and hairy +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
glabrous +  and hairy +
acute;rounded +
Christopher S. Campbell +, Michael B. Burgess +, Kevin R. Cushman +, Eric T. Doucette +, Alison C. Dibble +  and Christopher T. Frye +
(Tausch) M. Roemer +
fissuring in older trees +  and smooth +
salmon colored +, brown +  and gray +
compound +  and simple +
opposite +  and alternate +
cuneate +
Pyrus bartramiana +
5.1 cm51 mm <br />0.051 m <br /> (7.4 cm74 mm <br />0.074 m <br />) +
2.9 cm29 mm <br />0.029 m <br /> (4.8 cm48 mm <br />0.048 m <br />) +
3.7 cm37 mm <br />0.037 m <br /> (5.1 cm51 mm <br />0.051 m <br />) +
narrowly elliptic-oval +  and oblong +
membranous +  and coriaceous +
2 cm20 mm <br />0.02 m <br /> (?) +  and 2.9 cm29 mm <br />0.029 m <br /> (?) +
adnate +  and connate +
Mountain shadbush or serviceberry +  and amélanchier de Bartram +
St. Pierre and Miquelon +, N.B. +, Nfld. and Labr. +, N.S. +, Ont. +, P.E.I. +, Que. +, Maine +, Mass. +, Mich. +, Minn. +, N.H. +, N.Y. +, Pa. +, Vt. +, W.Va. +  and Wis. +
not +  and aggregated +
0–1500 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 />) +
Cool woods, mountain slopes, summits, bogs, poor fens, conifer swamps, acidic soil, sandy lake shores, stream banks, rocky ridges, roadside thickets +
glabrous +  and hairy +
funnel +  and campanulate +
2.5 cm25 mm <br />0.025 m <br /> (3.8 cm38 mm <br />0.038 m <br />) +
nodding +, spreading +, drooping +, erect +, ascending +  and arching +
1.3 cm13 mm <br />0.013 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
crassinucellate +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
deciduous +
pinnate +, dentate +, serrate +  and entire +
8 (?) +  and 14 (?) +
toothed +, unlobed +  and lobed +
6-10-loculed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
0.87 cm8.7 mm <br />0.0087 m <br /> (1.69 cm16.9 mm <br />0.0169 m <br />) +
0 (?) +  and 4 (?) +
0.53 cm5.3 mm <br />0.0053 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
pink +, ivory +  and white +
free +  and distinct +
7.1mm;8.7mm +
oblong-oval;broadly elliptic +
0.39 cm3.9 mm <br />0.0039 m <br /> (0.53 cm5.3 mm <br />0.0053 m <br />) +
1.05 cm10.5 mm <br />0.0105 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (1.05 cm10.5 mm <br />0.0105 m <br />) +
Flowering May–Aug +  and fruiting Jul–Sep. +
adnate +, free +, connate +  and distinct +
dark purple +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
pear--shaped +
2.1 cm21 mm <br />0.021 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
Fam. Nat. Syn. Monogr. +
4-17-flowered +
not arillate +
0.39 cm3.9 mm <br />0.0039 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
free +  and distinct +
ascending +  and recurved +
triangular +  and lanceolate +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.39 cm3.9 mm <br />0.0039 m <br />) +
free +  and distinct +
branched +  and simple +
erect +  and ascending +
hairy;glabrous +
1 +  and 50 +
0.52 cm5.2 mm <br />0.0052 m <br /> (0.61 cm6.1 mm <br />0.0061 m <br />) +
persistent +
connate +  and distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
Amelanchier bartramiana +
Amelanchier +
species +
inconspicuous +
250 cm2,500 mm <br />2.5 m <br /> (500 cm5,000 mm <br />5 m <br />) +