Directory       News       Site Map       Home
         
    Jepson eFlora
Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

SORBUS MOUNTAIN ASH

Peter F. Zika


Shrub, tree. Leaf: odd-1-pinnately compound [not], petioled, deciduous; leaflets generally toothed, terminal partly fused to uppermost lateral(s) or not. Inflorescence: panicle, many-flowered; pedicel bractlets 0. Flower: hypanthium bractlets 0, stamens generally 20; ovary generally inferior, chambers 1–5, styles 1–5, generally free. Fruit: pome, generally spheric, chambers 1–5, 1–2-seeded.
± 130 species: northern temperate, tropical Asia. (Latin: ancient name) Species intergrade.
Unabridged references: [Jones 1939 J Arnold Arbor 20:1–43]

Key to Sorbus

1. Hairs of stem-buds, leaflet axils, leaf axils, inflorescence ± white or ± gray

2. Leaflets dull adaxially, 11–17; stem-bud not shiny, not sticky, hairs dense ..... [S. aucuparia]

2' Leaflets shiny adaxially, 7–13; stem-bud shiny, sticky, hairs generally sparse ..... S. scopulina

1' Hairs of stem-buds, leaflet axils, leaf axils, inflorescence primarily red-brown

3. Leaflets shiny adaxially, 2–4 cm; stem-bud shiny, sticky, not glaucous, hairs generally only on scale margins, tips; flower, fruit pedicel ± glabrous ..... S. californica

3' Leaflets dull adaxially, 2–6 cm; stem-bud glaucous, not shiny, not sticky, hairs on scale margins, tips, faces; flower, fruit pedicel glabrous or ± hairy ..... S. sitchensis

4. Lateral leaflets ± entire or toothed above middle ..... var. grayi

4' Lateral leaflets toothed below middle ..... var. sitchensis

Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.