Sorbus intermedia

(Ehrhart) Persoon

Syn. Pl. 2: 38. 1806.

Common names: Swedish whitebeam
Introduced
Basionym: Pyrus intermedia Ehrhart Gartenkalender 4: 197. 1784
Synonyms: Aria intermedia (Ehrhart) Schur
Treatment appears in FNA Volume 9. Treatment on page 437. Mentioned on page 435.

Trees, to 70[–200] dm. Stems 1; bark gray; winter buds green to red-brown, ovoid, 5–12 mm, shiny, slightly glutinous, whitish-villous. Leaves simple; stipules early deciduous, densely whitish-villous; blade shiny, green to dark green adaxially, ovate to elliptic, 6–13 × 3.5–8.5 cm, margins proximally 4–7 pinnately lobed, lobes ± oblong, 1–1.5(–1.8) cm wide, basal sinuses deepest, margins distally coarsely serrate, main pairs of secondary veins 8–10, apex acute to obtuse, abaxial surface white-tomentose, adaxial glabrous or sparsely villous, indument usually persistent. Panicles 18–85-flowered, rounded, 6–17 cm diam.; peduncles white-tomentose. Pedicels white-tomentose. Flowers 14–16 mm diam.; hypanthium whitish-tomentose, hypanthium plus sepals 5–6 mm; sepals 1.5–2.5 mm, margins villous and eglandular, rarely with inconspicuous glands; petals white, elliptic to broadly ovate, 5–7 mm; stamens 20; carpels distinct, apex conic, styles 2, 2.5–4 mm. Infructescences thinly white-tomentose to glabrate. Pomes bright red, ellipsoid, sometimes narrowly obovoid, 7–16 × 6–11 mm, shiny, faintly glaucous; lenticels few; sepals inconspicuous, erect, villous toward apex. Seeds red-brown, narrowly ovoid, 6–6.5 × 2.5–3.1 mm, slightly asymmetric, slightly flattened. 2n = 68 (Europe).


Phenology: Flowering spring; fruiting fall.
Habitat: Thickets, roadsides, waste ground, disturbed conifer forests
Elevation: 0–100 m

Distribution

V9 735-distribution-map.jpg

Introduced; B.C., Ont., Mass., Wash., Europe.

Discussion

Sorbus aria (Linnaeus) Crantz of Europe has been reported from San Juan County, Washington (S. Atkinson and F. Sharpe 1993; J. T. Kartesz and C. A. Meacham 2003). Those populations are S. intermedia, with more deeply lobed leaves and broader winter buds.

Selected References

None.

Lower Taxa

None.
... more about "Sorbus intermedia"
Peter F. Zika +  and Stéphane M. Bailleul +
(Ehrhart) Persoon +
Pyrus intermedia +
Swedish whitebeam +
B.C. +, Ont. +, Mass. +, Wash. +  and Europe. +
0–100 m +
Thickets, roadsides, waste ground, disturbed conifer forests +
Flowering spring +  and fruiting fall. +
Introduced +
Aria intermedia +
Sorbus intermedia +
Sorbus subg. Aria +
species +