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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. macrophyllum Pursh

BIG-LEAF MAPLE

Tree 5–30 m
Stem: twigs coarse, glabrous, greenish to brownish
Leaf: petiole 5–12 cm; blade 10–25 cm wide, lobes 3–5, deep, irregularly few-toothed
Inflorescence long, pendent, > 30-flowered; staminate and bisexual flowers on same raceme
Flower: petals present
Fruit variable; body brown-hairy; wings spreading < 90°
Ecology: Common. Streambanks, canyons
Elevation: < 1500 m.
Bioregional distribution: California Floristic Province (except Great Central Valley)
Distribution outside California: to Alaska
Horticultural information: DRN: 4, 5, 6 &IRR: 1, 2, 3, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.

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