ROSACEAE

ROSE FAMILY

Annual to tree
Leaves simple to pinnately to palmately compound, generally alternate; stipules free to fused, persistent to deciduous
Inflorescence: cyme, raceme, panicle, or flowers solitary
Flower generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, often with bractlets alternate with sepals; sepals generally 5; petals generally 5, free; stamens (0)5–many, pistils (0)1–many, simple or compound; ovary superior to inferior, styles 1–5
Fruit: achene, follicle, drupe, pome, or blackberry- to raspberry-like
Seeds generally 1–5
Genera in family: 110 genera, ± 3000 species: worldwide, especially temp. Many cultivated for ornamental and fruit, especially Cotoneaster , Fragaria , Malus , Prunus , Pyracantha, Rosa , and Rubus
Reference: [Robertson 1974 J Arnold Arbor 55:303–332,344–401,611–662]
Family description, key to genera by Barbara Ertter and Dieter H. Wilken.

SORBUS

MOUNTAIN ASH

Thomas J. Rosatti

Shrub or tree
Leaves odd-1-pinnate in CA, petioled, deciduous; leaflets generally toothed, terminal sometimes partly fused to uppermost lateral(s)
Inflorescence: panicle, many-flowered
Flower: sepals 5; petals 5; stamens 15–20; ovary generally inferior, styles generally free
Fruit: pome; chambers 1–5, 1–2-seeded
Species in genus: ± 80 species: n temp
Etymology: (Latin: ancient name)
Reference: [Jones 1939 J Arnold Arbor 20:1–43]
Intergrading: native species might all = S. sitchensis.

Native

S. sitchensis F. Roem. var. grayi (Wenzig) C.L. Hitchc.

Shrub 1–3 m; stem-buds 5–7 mm, hairs generally sparse, marginal or ± evenly distributed, red-brown
Leaf: leaflets 7–11, 2–6 cm, 8–25 mm wide, ovate to oblong, generally toothed only above middle
Inflorescence: pedicel glabrous or ± red-brown-hairy
Flower: petals 3–4 mm, ovate
Fruit 7–10 mm, red
Seeds ± 3.5 mm, ovate, barely flat, dark brown
Ecology: Montane areas
Elevation: 600–3000 m.
Bioregional distribution: c Klamath Ranges (Salmon Mtns)
Distribution outside California: to British Columbia
Synonyms: S. occidentalis (S. Watson) Greene
Horticultural information: IRR, DRN, SHD: 1, 2, 4, 5, 6, 15, 16; DFCLT.