Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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ACERACEAE

MAPLE FAMILY

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]

ACER

MAPLE


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)

Native

A. negundo L. var. californicum (Torr. & A. Gray) Sarg.

BOX ELDER

Tree 6–20 m, dioecious
Stem: twigs hairy, greenish
Leaf pinnately compound; petiole 2–8 cm; leaflets 3–5, central largest, 5–12 cm, 3–5-lobed, toothed
Inflorescence generally appearing before leaves; pistillate pedicels long, drooping
Flower: petals 0
Fruit: body red, finely hairy, becoming straw-colored; wings widely spreading
Ecology: Streamsides, bottomlands
Elevation: < 1800 m.
Bioregional distribution: California Floristic Province.Has been planted widely (especially GV) as ornamental or street tree
Horticultural information: 4, 5, 6; IRR: 1, 2, 3, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24; INV; also STBL.

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