Sorbus sitchensis M.Roem.

Western mountain ash (en)

Species

Angiosperms > Rosales > Rosaceae > Sorbus

Characteristics

Shrubs, 10–40 dm. Stems 1–8; bark initially reddish purple to brownish gray, becoming grayish red; winter buds red-purple to red-brown, conic to ovoid, 8–13 mm, dull, ?slightly glaucous?, not glutinous, sparsely or densely villous, hairs primarily rufous. Leaves pinnately compound; stipules persistent, sometimes deciduous, hairs rufous; blade paler abaxially, dull blue-green, usually slightly glaucous, rarely faintly shiny adaxially, leaflets 7–13, opposite, sometimes subopposite, oblong to narrowly elliptic, sometimes oblanceolate, ovate, or obovate, 1.8–6 × 0.6–2.5 cm, l/w ratio 1.9–3.5, margins entire or finely to coarsely serrate, sometimes doubly serrate, apex obtuse or acute, surfaces soon glabrous, leaf and leaflet axils hairy, hairs rufous. Panicles 12–80-flowered, rounded, 2–8 cm diam.; peduncles glabrous, glaucous, or sparsely to densely villous, hairs primarily rufous. Pedicels glabrous, glaucous, or sparsely to densely villous, hairs primarily rufous. Flowers 11–17 mm diam.; hypanthium glabrous, ?glaucous?, hypanthium plus sepals 3–4 mm; sepals 1–2.2 mm, margins lightly to moderately ciliate, ?hairs rufous or whitish?, infrequently glandular; petals white, rarely pinkish, rhombic to ovate, 4–7.5 mm; stamens 15–20; carpels distinct, apex concave, depressed, or slightly conic and truncate, styles 3–5, 1.5–3.2 mm. Infructescences glabrous, glaucous, or villous. Pomes pinkish red or red (often appearing slightly purplish), subglobose to broadly elliptic or obovoid, 7–13 × 7–13 mm, dull, glaucous; sepals inconspicuous, incurved. Seeds red-brown, ovoid to ovoid-lanceolate, oblong or elliptic, 3.4–5 × 2.2–2.9 mm, symmetric or trigonous, slightly flattened.
More
A shrub or small tree. It grows to 6 m high. The bark is smooth and light grey. The crown is rounded. The leaves are alternate and compound. There are 7-11 leaflets on a red central stalk. This stalk is 8-15 cm long. The leaflets are oval and 2-6 mm long. There are teeth towards the tip. They are dark green above and paler underneath. The fruit are small. They are 6-8 mm across. They occur in erect rounded clusters. The fruit are orange, red or purple. They are 10-12 mm across. They occur in small clusters 5-10 cm across.
Life form perennial
Growth form tree
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination entomogamy
Spread -
Mature width (meter) -
Mature height (meter) 1.8
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Open conifer woods, forest edges, mountain slopes, meadows, shores of lakes and streams, rockslides, edges of avalanche tracks, peatlands, muskegs; mainly on rich, moist soils; at elevations up to 3,000 metres.
More
It is a temperate plant. It reaches the alpine tree line in Canada.
Light 4-9
Soil humidity 4-6
Soil texture 1-6
Soil acidity 3-7
Soil nutriment -
Hardiness (USDA) 4-8

Usage

The fruit are used for jellies, marmalades, jams, wines and liqueurs. The fruit can be dried and stored.
Uses insecticide medicinal spice wood
Edible fruits
Therapeutic use Antirheumatic (Internal) (bark), Gastrointestinal Aid (bark), Unspecified (bark), Eye Medicine (bark), Cold Remedy (bark), Cathartic (fruit), Antirheumatic (Internal) (root), Gastrointestinal Aid (root), Eye Medicine (root), Pediatric Aid (unspecified), Urinary Aid (unspecified), Ear Medicine (unspecified), Kidney Aid (unspecified)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by seedlings. Seeds needs stratification.
Mode seedlings
Germination duration (days) 120 - 180
Germination temperacture (C°) 18 - 21
Germination luminosity -
Germination treatment stratification
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Sorbus sitchensis unspecified picture

Distribution

Sorbus sitchensis world distribution map, present in Canada and United States of America

Conservation status

Sorbus sitchensis threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:741978-1
WFO ID wfo-0001015138
COL ID 4YBND
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Sorbus sitchensis Pyrus sitchensis Sorbus tilingii Pyrus sambucifolia Sorbus occidentalis Sorbus sitchensis var. sitchensis Sorbus sitchensis subsp. sitchensis