Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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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. diffusum (Greene) Smiley

Stem: twigs generally whitish
Leaf generally 1.2–2.8 cm wide; teeth few, blunt
Inflorescence: peduncle + pedicel 1–2 cm
Fruit: wings spreading generally 45°
Ecology: Habitats of sp.
Bioregional distribution: San Jacinto Mountains, East of Sierra Nevada, Desert Mountains
Distribution outside California: to Utah
Flowering time: Apr–May
Horticultural information: DRN, IRR: 1, 2, 3, 4, 5, 6, 7.

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bioregional map for ACER%20glabrum%20var.%20diffusum being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Acer glabrum var. diffusum
Retrieve dichotomous key for Acer
Overlay Consortium of California Herbaria specimen data by county on this map
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