Common names: Intermediate shadbush amélanchier intermédiaire
Endemic
Treatment appears in FNA Volume 9. Treatment on page 660. Mentioned on page 649, 657, 658, 659, 661.

Shrubs or trees, 2–7 m. Stems 1–50, fastigiate, solitary or in colonies. Leaves half-unfolded; petiole (14–) 16–21.8 (–24) mm; blade elliptic to slightly obovate, (39–) 46–65 (–77) × (25–) 26–38 (–45) mm, base subcordate or rounded, each margin with (5–) 13–19 (–20) teeth on proximal 1/2 and (5–) 13–19 (–20) teeth in distalmost cm, largest teeth less than 1 mm, apex acute to short-acuminate, abaxial surface sparsely hairy by flowering, surfaces glabrous later. Inflorescences (6 or) 7–10-flowered, 35–59 (–77) mm. Pedicels: 0 or 1 subtended by a leaf, proximalmost (13–) 14–25 (–33) mm. Flowers: sepals ascending to recurved after flowering, (2–) 3.3–4.5 (–5.2) mm; petals oblong, (10–) 12.7–17.7 (–18.5) × (3–) 3.9–5.3 (–5.7) mm; stamens (18–) 20 (–21); styles (4 or) 5, (3.3–) 3.8–4.8 (–5) mm; ovary apex glabrous (or sparsely hairy). Pomes dark purple, 7–12 mm diam. 2n = 4x.


Phenology: Flowering May–Jun; fruiting Jun–Aug.
Habitat: Swamps, bogs, thickets, shores
Elevation: 0–1000 m

Distribution

V9 1134-distribution-map.jpg

N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Conn., Maine, Md., Mich., Minn., N.H., N.J., N.Y., N.C., Pa., S.C., Vt., Va.

Discussion

Amelanchier intermedia is morphologically closest to A. laevis. In a study of morphologic variation involving A. canadensis, A. intermedia, A. laevis, and other species of Amelanchier, A. C. Dibble et al. (1998) found that the only two species that overlap are A. intermedia and A. laevis. P. Landry (1975) considered A. intermedia to be the hybrid of A. arborea (including A. laevis) and A. canadensis, and the authors have data that suggest A. intermedia is a hybrid of A. canadensis and A. laevis.

Amelanchier intermedia hybridizes with A. bartramiana, A. humilis, and A. spicata (L. Cinq-Mars 1971).

A. C. Dibble et al. (1998) reported that two individuals of Amelanchier intermedia, both tetraploids, were apomictic.

Selected References

None.

Lower Taxa

None.
... more about "Amelanchier intermedia"
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 +
fissuring in older trees +  and smooth +
salmon colored +, brown +  and gray +
compound +  and simple +
opposite +  and alternate +
rounded +  and subcordate +
6.5 cm65 mm <br />0.065 m <br /> (7.7 cm77 mm <br />0.077 m <br />) +
3.8 cm38 mm <br />0.038 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
4.6 cm46 mm <br />0.046 m <br /> (6.5 cm65 mm <br />0.065 m <br />) +
elliptic +  and slightly obovate +
? (?) +  and ? (?) +
26mm +  and 38mm +
adnate +  and connate +
Intermediate shadbush +  and amélanchier intermédiaire +
N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Maine +, Md. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Pa. +, S.C. +, Vt. +  and Va. +
not +  and aggregated +
0–1000 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 />) +
Swamps, bogs, thickets, shores +
glabrous +  and hairy +
5.9 cm59 mm <br />0.059 m <br /> (7.7 cm77 mm <br />0.077 m <br />) +
nodding +, spreading +, drooping +, erect +, ascending +  and arching +
3.5 cm35 mm <br />0.035 m <br /> (5.9 cm59 mm <br />0.059 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 +
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 />) +
1.77 cm17.7 mm <br />0.0177 m <br /> (1.85 cm18.5 mm <br />0.0185 m <br />) +
0 (?) +  and 4 (?) +
0.53 cm5.3 mm <br />0.0053 m <br /> (0.57 cm5.7 mm <br />0.0057 m <br />) +
Pink (?) +, Ivory (?) +  and White (?) +
free +  and distinct +
1.27 cm12.7 mm <br />0.0127 m <br /> (1.77 cm17.7 mm <br />0.0177 m <br />) +
0.39 cm3.9 mm <br />0.0039 m <br /> (0.53 cm5.3 mm <br />0.0053 m <br />) +
2.18 cm21.8 mm <br />0.0218 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
1.6 cm16 mm <br />0.016 m <br /> (2.18 cm21.8 mm <br />0.0218 m <br />) +
Flowering May–Jun +  and fruiting Jun–Aug. +
adnate +, free +, connate +  and distinct +
dark purple +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
2.5 cm25 mm <br />0.025 m <br /> (3.3 cm33 mm <br />0.033 m <br />) +
1.4 cm14 mm <br />0.014 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Hist. Nat. Vég. +
4-17-flowered +
not arillate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.52 cm5.2 mm <br />0.0052 m <br />) +
persistent +
free +  and distinct +
ascending +  and recurved +
triangular +  and lanceolate +
0.33 cm3.3 mm <br />0.0033 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
free +  and distinct +
branched +  and simple +
erect +  and ascending +
1 +  and 50 +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
persistent +
connate +  and distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.48 cm4.8 mm <br />0.0048 m <br />) +
Amelanchier intermedia +
Amelanchier +
species +
13 +  and 19 +
inconspicuous +
tree +  and shrub +