Sorbus aucuparia |
Sorbus sambucifolia |
|
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European mountain-ash, rowan, rowan-berry, sorbier des oiseaux, sorbier des oiseleurs |
Aleutian Mountain ash, Siberian Mountain ash |
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Habit | Trees, 60–150 dm. | Shrubs, 10–20 dm. |
Stems | 1–3(or 4); bark gray to bronze; winter buds purple, ovoid to ovoid-conic, 5–15 mm, dull, not glutinous, usually densely villous, hairs whitish, rarely rufous, outer scales sometimes merely ciliate. |
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 deciduous or persistent, whitish-villous or glabrate; blade paler or often whitish abaxially, dull green to bluish green adaxially, leaflets 11–17(–19), opposite, oblong to oblong-lanceolate or oblanceolate, (2.5–)3–6(–7.5) × 1.5–2 cm, l/w ratio 2.4–3.7, margins serrate at least in distal 1/2, often almost to base, apex acute to obtuse, abaxial surface white-tomentose to villous at flowering, indument often persisting, at least along midveins, leaflet axils, and petiole bases, hairs usually whitish, sometimes rufous. |
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 | 75–200+-flowered, flat-topped or rounded, 6–18 cm diam.; peduncles ± whitish-villous. |
6–23-flowered, rounded, 2.5–7 cm diam.; peduncles sparsely rufous-villous. |
Pedicels | densely whitish-villous. |
sparsely rufous-villous. |
Flowers | 8–11 mm diam.; hypanthium densely villous, hairs whitish, hypanthium plus sepals 2.9–3.2 mm; sepals 0.5–1 mm, margins often glandular; petals white, orbiculate, (3–)4–5 mm; stamens 15–20; carpels 1/2 adnate to hypanthium, apex conic, styles 3 or 4, 1.5–3 mm. |
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 or densely villous. |
glabrous. |
Pomes | yellow or orange-red to red, globose to subglobose, 8–12 mm diam., shiny or dull, slightly glaucous or not; sepals inconspicuous, incurved. |
red, ellipsoid, 10–12 × 7–9 mm, shiny, not glaucous; sepals prominent, erect. |
Seeds | brown, ovoid to ovoid-lanceoloid, 3–4.5 × 1.5–2 mm, asymmetric, slightly flattened. |
dark brown, lanceoloid, 4 × 2 mm, symmetric, not flattened. |
2n | = 34. |
= 34 (Asia). |
Sorbus aucuparia |
Sorbus sambucifolia |
|
Phenology | Flowering spring; fruiting fall. | Flowering spring; fruiting fall. |
Habitat | Thickets, roadsides, woods, other habitats near towns, scattered in remote natural settings | Slopes and meadows |
Elevation | 0–2100 m (0–6900 ft) | 0–100 m (0–300 ft) |
Distribution |
AK; CA; CO; CT; DC; IA; ID; IL; IN; MA; MD; ME; MI; MN; MT; ND; NE; NH; NJ; NY; OH; OR; PA; RI; SC; SD; UT; VT; WA; WI; WV; WY; AB; BC; NB; NF; NS; ON; PE; QC; SK; SPM; Eurasia; n Africa; Atlantic Islands (Iceland, Madeira) [Introduced in North America; introduced also in Pacific Islands (New Zealand)]
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AK; e Asia (Japan, Russian Far East [Commander Islands, Kamchatka, Kuril Islands]) |
Discussion | Sorbus aucuparia is a commonly planted ornamental tree that is widely bird-disseminated. The species is often confused with S. decora, from which it differs by its ovoid and usually densely whitish-villous and nonglutinous winter buds and by its densely villous flowering pedicels and hypanthia. The leaflets of S. aucuparia are often tomentose abaxially at flowering; those of S. decora are glabrous or sparsely villous. Examination of leaflet serration is also useful; S. decora exhibits a prolonged apical tooth; it is no longer than the lateral ones in S. aucuparia. The lateral teeth are relatively finer and sharper in S. decora compared to those of S. aucuparia. At a magnification of at least 70× , leaflets of S. aucuparia are reportedly minutely papillose abaxially; those of S. decora are not papillose (H. A. McAllister 2005). Natural hybrids with S. decora have been reported by G. N. Jones (1939) (one fruiting specimen found near Opeongo Lake, Algonquin Park, Ontario), with Aronia arbutifolia [x\Sorbaronia hybrida (Moench) C. K. Schneider; synonyms A. hybrida (Moench) Zabel, Sorbus spuria Persoon] in Truro, Nova Scotia, and also in Maine, New Hampshire, and Vermont (D. W. Magee and H. A. Ahles 1999), and with A. melanocarpa (x\Sorbaronia fallax C. K. Schneider) in Maine and Massachusetts. Other nothospecies names for putative intergeneric hybrids involving S. aucuparia include: ×Crataegosorbus miczurinii Pojarkova (Crataegus sanguinea Pallas × S. aucuparia), and ×Sorbocotoneaster pozdnjakovii Pojarkova (Cotoneaster melanocarpus (Ledebour) Loddiges, G. Loddiges & W. Loddiges ex M. Roemer × S. aucuparia [as S. sibirica Hedlund]). Subspecies of Sorbus aucuparia were recognized by McAllister; the authors made no attempt to identify specimens infraspecifically. Sorbus subvestita Greene is variably considered to be a synonym of S. aucuparia (Jones) or S. decora (M. L. Fernald 1950; H. A. Gleason and A. Cronquist 1991). However, Jones explicitly cited the isotype of S. subvestita in his specimen citation for S. aucuparia along with an acknowledgement of the confusion with S. decora. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 9, p. 438. | FNA vol. 9, p. 443. |
Parent taxa | Rosaceae > subfam. Amygdaloideae > tribe Maleae > Sorbus > subg. Sorbus > sect. Sorbus | Rosaceae > subfam. Amygdaloideae > tribe Maleae > Sorbus > subg. Sorbus > sect. Sambucifoliae |
Sibling taxa | ||
Synonyms | Pyrus aucuparia, S. subvestita | Pyrus sambucifolia |
Name authority | Linnaeus: Sp. Pl. 1: 477. (1753) | (Chamisso & Schlechtendal) M. Roemer: Fam. Nat. Syn. Monogr. 3: 139. (1847) |
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