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|Family: Sapindaceae||View Description||Dichotomous Key|
|Genus: Acer||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Acer negundo L.
Habit: Tree < 20 m; dioecious. Leaf: 1--2-ternate, leaflets 3(9); terminal leaflets 4--11 cm, 3--9 cm wide, toothed, generally 1--2-lobed, abaxial surface green, generally felty, occasionally sparsely pubescent Inflorescence: panicle axillary, pendent, appearing with leaves, flowers 10--250. Flower: petals 0. Fruit: wings spreading 60--90°.
Ecology: Streamsides, bottomland; Elevation: < 1800 m. Bioregional Distribution: CA-FP; Distribution Outside California: United States, southern Canada, southern to South America. Flowering Time: Mar--Apr Note: Widely planted, especially GV, as ornamental or street tree.
Synonyms: Acer negundo var. arizonicum Sarg.; Acer negundo var. californicum (Torr. & A. Gray) Sarg.; Acer negundo var. interius (Britton) Sarg.
Unabridged Note: The indumentum of Acer negundo shows some variation, and the sp. has been divided into several varieties or subspecies based on indumentum differences. Most California specimens have rather dense, velvety, spreading hairs ca. 0.3 mm on the leaves, stems; If recognized taxonomically, such plants assignable to var. californicum (Torr. & A. Gray) Sarg. If recognized taxonomically: occasionally plants with glabrous, glaucous twigs assignable to var. arizonicum Sarg.; plants having twigs canescent with short hairs (+- 0.1 mm) assignable to var. interius (Britt.) Sarg. These forms based on hairs are scattered throughout the same geographic area, they intergrade with one another, and they do not appear to be well correlated with any other characters. So the varieties seem unnatural, at least as they are currently circumscribed. Humans have been planting Acer negundo genotypes from eastern United States in California since the middle of the 19th century. Old trees may persist on abandoned homesites, but the extent to which they reproduce themselves or cross with native genotypes in California is unknown. Specimens from GB seem to represent planted trees persisting on old homesites. Acer negundo may be naturalizing at one site in Modoc Co. (Bartholomew 6714, CAS).
eFlora Treatment Author: Alan T. Whittemore
Jepson Online Interchange
Previous taxon: Acer macrophyllum
Next taxon: Acer saccharinum
Citation for this treatment: Alan T. Whittemore 2016. Acer negundo, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=11747, accessed on October 26, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on October 26, 2016.