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Key to families | Table of families and genera

This text currently parallels The Jepson Manual: Vascular Plants of California, Second Edition that is now available at the University of California Press.

Text appearing in blue on this page will not appear in the printed book; it will be displayed only on the Web. 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: n temperate, tropical Asia. (Latin: ancient name) Spp. 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. Lflets dull adaxially, 11–17; stem-bud not shiny, not sticky, hairs dense ..... [S. aucuparia]

2' Lflets 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. Lflets 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' Lflets 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

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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].
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