Sorbus sambucifolia

(Chamisso & Schlechtendal) M. Roemer

Fam. Nat. Syn. Monogr. 3: 139. 1847.

Common names: Aleutian mountain ash
Basionym: Pyrus sambucifolia Chamisso & Schlechtendal Linnaea 2: 36. 1827
Treatment appears in FNA Volume 9. Treatment on page 443. Mentioned on page 434, 435.

Shrubs, 10–20 dm. Stems 1–8; bark gray; winter buds blackish red to black, conic, 7–18 mm, shiny, slightly glutinous, sparsely villous distally, hairs primarily rufous. Leaves pinnately compound; stipules sometimes persistent, margins and surface hairy, hairs rufous; blade paler abaxially, shiny, green to dark green adaxially, leaflets 7–11, opposite or subopposite, lanceolate, sometimes narrowly elliptic, elliptic, oblong, or oblanceolate, 2.5–6.5 × 0.9–2.5 cm, l/w ratio 1.9–3.8, margins serrate, apex usually acute to acuminate or attenuate, sometimes obtuse, surfaces soon glabrous; leaf and leaflet axils hairy, hairs rufous. Panicles 6–23-flowered, rounded, 2.5–7 cm diam.; peduncles sparsely rufous-villous. Pedicels sparsely rufous-villous. Flowers 10–15 mm diam.; hypanthium glabrous, hypanthium plus sepals (4.5–) 5–6 mm; sepals 1.5–2.9 mm, margins usually villous, hairs white and reddish mixed [white], rarely sparsely glandular; petals white to pinkish, orbiculate or ovate, 4–5 mm; stamens 20; carpels almost completely adnate to hypanthium, apex truncate or slightly conic, styles 4 or 5, 1.5–3.5 mm. Infructescences glabrous. Pomes red, ellipsoid, 10–12 × 7–9 mm, shiny, not glaucous; sepals prominent, erect. Seeds dark-brown, lanceoloid, 4 × 2 mm, symmetric, not flattened. 2n = 34 (Asia).


Phenology: Flowering spring; fruiting fall.
Habitat: Slopes and meadows
Elevation: 0–100 m

Distribution

V9 746-distribution-map.jpg

Alaska, e Asia (Japan), e Asia (Russian Far East [Commander Islands), e Asia (Kamchatka), e Asia (Kuril Islands])

Discussion

In North America, Sorbus sambucifolia is known only from the four westernmost islands of the Aleutians, where it is allopatric from all other Sorbus. Sorbus scopulina is known from farther east in the Aleutians; sterile specimens differ in their whitish, not rufous indument, and the less deeply sunken reticulate venation on the adaxial surfaces of the leaflets.

Selected References

None.

Lower Taxa

None.
... more about "Sorbus sambucifolia"
Peter F. Zika +  and Stéphane M. Bailleul +
(Chamisso & Schlechtendal) M. Roemer +
compound +  and simple +
opposite +  and alternate +
not +  and clawed +
Pyrus sambucifolia +
green +  and dark green +
ovate +  and oblong +
5 cm50 mm <br />0.05 m <br /> (33 cm330 mm <br />0.33 m <br />) +
? (?) +  and ? (?) +
glutinous +
blackish red +  and black +
0.7 cm7 mm <br />0.007 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
odd +  and simple +
divided +  and lobed +
tanniferous +
Aleutian mountain ash +
Alaska +, e Asia (Japan) +, e Asia (Russian Far East [Commander Islands) +, e Asia (Kamchatka) +  and e Asia (Kuril Islands]) +
not +  and aggregated +
0–100 m +
single-layered +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
rancid +, unpleasant +  and strong +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
yellow +, brown +, red +  and orange +
glabrous +, hairy +  and glaucous +
0.4 cm4 mm <br />0.004 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
Slopes and meadows +
white and reddish +  and rufous +
green +  and red +
0.2 cm2 mm <br />0.002 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
crassinucellate +
deciduous +
subopposite +  and opposite +
0.9 cm9 mm <br />0.009 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
papillose +
oblanceolate +, oblong +, elliptic +  and lanceolate +
persistent +
villous +  and hairy +
toothed +, unlobed +  and lobed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and basal +
3 +  and 2 +
6-23-flowered +
2.5 cm25 mm <br />0.025 m <br /> (7 cm70 mm <br />0.07 m <br />) +
hairy +, glaucous +  and glabrous +
rufous-villous +
rufous-villous +
0 (?) +  and 4 (?) +
free +  and distinct +
2 +  and 5 +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering spring +  and fruiting fall. +
adnate +, free +, connate +  and distinct +
1 cm10 mm <br />0.01 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
not glaucous +
ellipsoid +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Fam. Nat. Syn. Monogr. +
not arillate +
4 cm40 mm <br />0.04 m <br /> (?) +
not flattened;lanceoloid +
2 cm20 mm <br />0.02 m <br /> (?) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
persistent +
free +  and distinct +
triangular +  and ovate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.29 cm2.9 mm <br />0.0029 m <br />) +
free +  and distinct +
branched +  and simple +
ascending +  and erect +
1 +  and 8 +
persistent +  and deciduous +
short-adnate +  and free +
persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
elongate +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
glabrous +  and hairy +
Sorbus sambucifolia +
Sorbus sect. Sambucifoliae +
species +
inconspicuous +
hairy +  and glabrous +