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Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
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Tree, shrub, [woody vine]. Leaf: opposite [alternate], generally palmately or ternately [pinnately] lobed to compound, deciduous, petioled; stipules 0. Inflorescence: umbel, panicle, or pendent raceme, axillary or terminal. Flower: unisexual or bisexual, radial or ± bilateral; sepals (4)5, free or fused; petals 0, 4, or 5(6); prominent disk between petals and stamens; stamens 5–12, free; ovary superior, chambers 2–3, each 2-ovuled, style short or 0, stigmas 2(3), linear, or 1, unlobed. Fruit: 2(3) 1-seeded mericarps, conspicuously winged, or generally leathery, generally 1[many]-seeded capsule [berry, nut, drupe].
150 genera, 1500 species: ± worldwide. Acer traditionally placed in Aceraceae, Aesculus in Hippocastanaceae. Cupaniopsis anacardioides (A. Rich.) Radlk. possibly naturalizing in southern California. —Scientific Editors: Douglas H. Goldman, Bruce G. Baldwin.
Unabridged references: [Harrington, M.G., K.J. Edwards, S.A. Johnson, M.W. Chase, & P.A. Gadek. 2005. Phylogenetic inference in Sapindaceae sensu lato using plastid matK and rbcL DNA sequences. Syst Bot 30: 366–382.]
Unabridged note: Acer and Aesculus have traditionally been placed in small families (Aceraceae and Hippocastanaceae, respectively). However, virtually all the traits considered characteristic of these two small families are also found in the closely related large family Sapindaceae, and it seems more reasonable to emphasize the close relationship of the whole group by treating it as a single family, rather than maintaining two small segregate families that differ from Sapindaceae in virtually nothing except opposite leaves (Harrington et al. 2005).
Key to Sapindaceae
Shrub, tree; occasionally monoecious. Inflorescence: umbel, panicle, or pendent raceme.Key to Acer
± 130 species: northern hemisphere. (Latin name for Acer campestre) Many species monoecious or dioecious.
Unabridged note: The sexuality of Acer species is complex, with some species described as dioecious or monoecious and many species described as having both unisexual and bisexual flowers on the same tree. However, maple flowers that appear morphologically bisexual may be functionally unisexual, producing functional pollen or ovules but not both. More study of sexuality is needed in our native maples. In some Acer species, fruit may become fully developed even if no seed is set, so that production of morphologically normal fruit is no proof that a plant is reproducing.
Tree, < 20 m; monoecious or dioecious. Leaf: 8–13 cm, 9–13 cm wide, 5-lobed for 1/2–3/4 of leaf length, lobes coarsely sharp-toothed or -lobed again, abaxial surface white or white-green, inconspicuously appressed-pubescent, occasionally sparsely long-hairy on major veins and leaf base. Inflorescence: axillary, dense, flowers ± 15–100, appearing before leaves. Flower: petals 0. Fruit: wings spreading 60–120°.
Riparian woodland; < 50 m. Sacramento Valley; eastern United States, Canada. Feb–Mar [Online Interchange]
Previous taxon: Acer negundo
Next taxon: Aesculus
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Sep 4 2015
Citation for this treatment: [Author of taxon treatment] 2013. Acer, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11758, accessed on Sep 4 2015
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© 2004 Robert E. Preston, Ph.D.
|Geographic subdivisions indicated for the distribution of Acer saccharinum|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
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