Amelanchier gaspensis

(Wiegand) Fernald & Weatherby

Rhodora 33: 235. 1931.

Common names: Gaspé shadbush amélanchier de Gaspésie
Endemic
Basionym: Amelanchier sanguinea var. gaspensis Wiegand Rhodora 14: 139. 1912
Treatment appears in FNA Volume 9. Treatment on page 654. Mentioned on page 650, 658.

Shrubs, 0.5–6 m. Stems 1–40, suckering and densely colonial. Leaves mostly unfolded; petiole (8–) 12.8–20.7 (–25) mm; blade broadly oblong to suborbiculate, (32–) 41–57 (–63) × (26–) 30–40 (–45) mm, base cordate or rounded, each margin with (0–) 3–9 (–12) teeth on proximal 1/2 and 3–5 teeth in distalmost cm, largest teeth more than 1 mm, apex rounded to subtruncate or short-pointed, abaxial surface moderately (sparsely or densely) hairy by flowering, surfaces sparsely hairy (or glabrous) later. Inflorescences (3–) 5–10 (–12) -flowered, (20–) 35–50 (–55) mm. Pedicels: 1 or 2 subtended by a leaf, proximalmost (9–) 12–19 (–26) mm. Flowers: sepals recurved after flowering, (2.6–) 3–4.5 (–5.9) mm; petals oblanceolate, (8–) 9.7–13.5 (–15) × (3–) 4.1–6.2 (–7) mm; stamens (17–) 18–20 (–21); styles (4 or) 5, (2.3–) 2.6–3.5 (–4.1) mm; ovary apex densely hairy. Pomes blackish purple, 10 mm diam. 2n = 4x.


Phenology: Flowering May–Jun; fruiting Jul–Sep.
Habitat: Calcareous shores, gravel beaches, cliffs, ledges, alluvial woods, roadsides
Elevation: 0–300 m

Discussion

K. M. Wiegand (1912) considered Amelanchier gaspensis to be perplexing because it varies much in stature and habit, as well as in leaf outline and dentition. The leaves suggest an intermediate condition between A. sanguinea and A. humilis, especially in the venation.

G. N. Jones (1946) considered the range of Amelanchier gaspensis to extend off the Gaspé Peninsula in Quebec and into Ontario and Michigan; he listed 13 specimens away from the Gaspé, and uncertainty exists about the identity of some of these specimens. For some specimens, Jones first annotated them as A. spicata and later changed his annotation to A. gaspensis. Wiegand annotated one of the specimens as “A. humilis x?,” another specimen as “A. humilis,” and another as “A. florida” (A. alnifolia var. semiintegrifolia). E. G. Voss (1972–1996, vol. 2) included A. gaspensis in A. sanguinea. M. L. Fernald (1950) reported A. gaspensis from northern Maine; specimens from there assigned to A. gaspensis do not match it in all respects. The occurrence of A. gaspensis away from the Gaspé remains questionable.

Selected References

None.

Lower Taxa

None.
... more about "Amelanchier gaspensis"
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 +
(Wiegand) Fernald & Weatherby +
fissuring in older trees +  and smooth +
salmon colored +, brown +  and gray +
compound +  and simple +
opposite +  and alternate +
rounded +  and cordate +
Amelanchier sanguinea var. gaspensis +
5.7 cm57 mm <br />0.057 m <br /> (6.3 cm63 mm <br />0.063 m <br />) +
4 cm40 mm <br />0.04 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
4.1 cm41 mm <br />0.041 m <br /> (5.7 cm57 mm <br />0.057 m <br />) +
broadly oblong +  and suborbiculate +
? (?) +  and ? (?) +
30mm +  and 40mm +
adnate +  and connate +
Gaspé shadbush +  and amélanchier de Gaspésie +
not +  and aggregated +
0–300 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 />) +
Calcareous shores, gravel beaches, cliffs, ledges, alluvial woods, roadsides +
glabrous +  and hairy +
(3-)5-10(-12)-flowered +
5 cm50 mm <br />0.05 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
nodding +, spreading +, drooping +, erect +, ascending +  and arching +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 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 />) +
1.35 cm13.5 mm <br />0.0135 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0 (?) +  and 4 (?) +
0.62 cm6.2 mm <br />0.0062 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Pink (?) +, Ivory (?) +  and White (?) +
free +  and distinct +
0.97 cm9.7 mm <br />0.0097 m <br /> (1.35 cm13.5 mm <br />0.0135 m <br />) +
0.41 cm4.1 mm <br />0.0041 m <br /> (0.62 cm6.2 mm <br />0.0062 m <br />) +
2.07 cm20.7 mm <br />0.0207 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
1.28 cm12.8 mm <br />0.0128 m <br /> (2.07 cm20.7 mm <br />0.0207 m <br />) +
Flowering May–Jun +  and fruiting Jul–Sep. +
adnate +, free +, connate +  and distinct +
blackish purple +
10 cm100 mm <br />0.1 m <br /> (?) +
1.9 cm19 mm <br />0.019 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
4-17-flowered +
not arillate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.59 cm5.9 mm <br />0.0059 m <br />) +
persistent +
free +  and distinct +
triangular +  and lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
free +  and distinct +
branched +  and simple +
colonial +  and suckering +
erect +  and ascending +
1 +  and 40 +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.41 cm4.1 mm <br />0.0041 m <br />) +
persistent +
connate +  and distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
0.26 cm2.6 mm <br />0.0026 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
Amelanchier gaspensis +
Amelanchier +
species +
3 +  and 9 +
inconspicuous +