Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

  • Up-to-date information about California vascular plants is available from the Jepson eFlora.



James R. Shevock

Shrubs, trees, sometimes monoecious, dioecious, or with staminate and bisexual flowers
Leaves opposite, generally simple, generally palmately lobed (rarely pinnate), generally deciduous; stipules 0
Inflorescence: panicle, raceme, or umbel-like
Flower small; perianth generally ± yellowish green; sepals (4)5, free; petals generally 5 (sometimes 0, 4, or 6), free, generally sepal-like; stamens generally 8 (sometimes 5, 10, or 12), generally attached to edge of nectary disk; ovary superior, chambers 2, each 2-ovuled
Fruit: generally pair of achenes, conspicuously winged
Seed generally 1 per achene
Genera in family: 2 genera, ± 120 species: n temp, tropical mtns (Dipteronia : 2 species: China). Some Acer important as timber or ornamental, often has bright autumn colors
Reference: [Ogata 1967 Bull Tokyo U For 63:89–206]



Leaf simple or pinnately compound
Inflorescence: flower clusters drooping, generally appearing before or with emerging leaves
Fruit paired, each with elongate wing ribbed on proximal side
Species in genus: ± 118 species: n hemisphere
Etymology: (Latin name for maple)


A. glabrum Torr.


Shrub or small tree, 2–6 m, ± erect, dioecious (or staminate plant with some bisexual flowers)
Leaf 2–4 cm wide, palmately lobed
Inflorescence dense, generally < 10-flowered
Flower: petals present
Fruit: body glabrous; wings overlapping or spreading < 45°
Ecology: Moist to fairly dry, montane, rocky slopes, canyons
Elevation: 1500–2800 m.
Bioregional distribution: Klamath Ranges, High Cascade Range, s Sierra Nevada Foothills, San Jacinto Mountains, Great Basin Floristic Province, Desert Mountains
Distribution outside California: to Alaska, c US, New Mexico
Complex of 6 vars. (var. glabrum in US Rocky Mtns, c US).


var. torreyi (Greene) Smiley

Stem: twigs generally reddish
Leaf generally 3–5 cm wide; central lobe largest; teeth few–many, obtuse
Inflorescence: peduncle + pedicel 1.7–4 cm
Fruit: wings spreading ± 45°
Ecology: Habitats of sp.
Bioregional distribution: Klamath Ranges, High Cascade Range, High Sierra Nevada, Modoc Plateau
Distribution outside California: Nevada
Horticultural information: DRN, IRR: 1, 2, 3, 4, 5, 6, 7, 17 &SHD: 15, 16; DFCLT.

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bioregional map for ACER%20glabrum%20var.%20torreyi being generated

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