452 ACERACEAE 



1. ACER I.. Mai -LI-: 



Loaves simple or pinnate. Fhtwcis small, the clusters always dronpinj::. — 

 Species 120. North America. Enrojie. Asia, and 1 species in nortiivvest Africa. 

 (Ancient Latin name of the Maph' tree.) 



Leaves simple; flowers polygamous; petals present. 



Flowers in raeemes; samaras more or less hispid; leaf-blades large, deeply 5-lobed 



1. A. viacrnphyllum. 

 Flowers in corymbs ; samaras glabrous. 



Leaf -blades shallowly but acutely 7 to 9-lobed; sepals nearly twice as long as the petals. 



2. A. circinat am. 



Leaf-blades mostly 3-lobed or -parted; sepals equaling petals 3. A. glabrum. 



Leaves pinnately or ternately compound; flowers dioecious; petals none 4. A. negundo. 



1. A. macrophyllum Pursli. Bio-leaf Maple. Broad-crowned tree 30 to 95 

 feet hijih; leaf-blades roundish in outline, palmately parted into 5 broad fingers, 

 4 to 131/^ inches wide; perfect and staminate flowers mixed in the same raceme; 

 stamens 7 to 9, villous below; bodj^ of samara short-bristly, golden at maturity. 



Banks of living streams, deep caiions, valley fiats and moist hill slopes, 5 to 

 5000 feet: mostly throughout cismontane California, though absent from the 

 plains of the Great Valley. North to Alaska. ]\rar.-Apr. 



Locs. — S. Cal. : Hot Springs valley, n. San Diego Co. (Sargent, Silva 2 :90) ; Claymine Canon, 

 Santa Ana Mts., J. T. Eoicdl 2839 ; Mill Creek Cafion, San Bernardino Mts., Jepson ; Altadena, 

 C. E. Hutchinson ; Mt. Wilson, Peirson 107a ; Eock Creek, San Gabriel Mts., Peirson 107 ; Topango 

 Canon, Santa Monica Mts., Epling <?• Ellison; Horn Canon, Ojai, Olive Thacher ; San Marcos Pass, 

 Santa Inez Mts., Jepson. Coast Ranges: Santa Margarita, Condit ; Santa Lucia Creek, Santa 

 Lucia Mts., Jepson 4728; Boulder Creek, Santa Cruz Co., H. A. Walker 754; Saratoga, Santa 

 Clara Co., Davy 290; Niles, Jepson; Mt. Diablo, Jepson; Las Trampas Creek, Contra Costa Co., 

 Jepson 6853a; Ross Valley, Marin Co., Jepson 1192a; Twin Sisters Peak, w. Solano Co., Jepson 

 2390 ; St. Helena, Jepson ; Miller Canon, Vaca Mts., Jepson ; Cache Creek Canon, w. Yolo Co., 

 C. F. Baler 2981; South Mill Creek, Ukiah, Jepson 2421; Walker Valley, cent. Mendocino Co., 

 Jepson; Mail Ridge, Humboldt Co., Jepson 1887; Bull Creek, Humboldt Co., Jepson 16,448; Elk 

 Prairie, Humboldt Co., Davy 5435; Hupa Valley, Goddard ; Shasta Sprs., Jepson; Shackelford 

 Canon, w. Siskiyou Co., Jepson; Humbug, Siskiyou Co., Butler 767; Cottage Grove, Klamath 

 River, Jepson ; Quartz Creek, Del Norte Co., Jepson. Sierra Nevada : Cedar Creek, North Fork 

 Kaweah River, Jepson 609; Greeley Hill, Mariposa Co., Jepson; Yosemite, Jepson; Hetch- 

 Hetchy, Jepson; Yankee Hill, Tuolumne Co., A. L. Grant 638; Indian Creek, Calaveras Co., Drew ; 

 Bear Valley, Nevada Co., Jepson 13,938; Rich Pt., Feather River, Jepson; Berry Creek, Butte 

 Co., Jepson ; Beldcn, Plumas Co., Jepson ; Cow Creek, Shasta Co., M. S. Balcer. 



Refs. — Acer macrophyllum Pursh, Fl. 267 (1814), type loc. Columbia River rapids, Lewis; 

 Nutt. Sylva 2:24, pi. 67 (1865) ; Jepson, Fl. W. Mid. Cal. 252 (1901), ed. 2, 250 (1911), SOva 

 264, pi. 80, figs. 1-2 (1910), Man. 611, fig. 610 (1925). Var. brevialatum O. Ktze. Rev. Gen. PI. 

 1:146 (1891), type from Cal., wings short and broad. Var. imbricatum O. Ktze. I.e., type from 

 Cal., wings erect, in part overlapping. The following slight forms are in part ecological: A. 

 flabellatum Greene, Lflts. 2:249 (1912), type from n. Cal., Wilkes Expcd. A. coptophyllum 

 Greene, I.e. 250, type from Humboldt Co., C. C. Marshall. A. platypterum Greene, I.e., type loc. 

 Round Valley, Mendocino Co., Chesnut. A. auritum Greene, I.e. 251, based on Putah Canon, e. 

 Napa Co., Brewer 1316, and Calistoga, Napa Valley, Pringle. A. stellatum Greene, I.e. 252, type 

 loc. Cache Creek Canon, Yolo Co., C. F. Balcer 2981. A hemionitis Greene, I.e. type loc. Tassa- 

 jara Hot Sprs., Monterey Co., Elmer 3179. A. dactylophyllum Greene, I.e. 253, type loc. San 

 Bernardino Mts., Parish. A. leptodactylon Greene, I.e., type loc. Sulphur Mt., Ventura Co., 

 Abrams 4' McGregor. A. politum Greene, I.e. 254, type loc. Johnson Creek, Fort Tejon, Kern Co., 

 Coville 4" Funston 1166. 



2. A. circinatum Pursh. Vine Maple. Shrub or sometimes a small tree, 

 erect and 5 to 20 feet high, but more often vine-like or reclining; leaf -blades 2 to 

 4 inches broad, 5 to 7-lobed to the middle, with toothed margin; flowers 4 to 10 or 

 more in a corymb, most of them staminate, the cluster often setting but one fruit; 

 stamens 6 to 10, shorter than the petals in the perfect flow'er but longer than the 

 petals in the staminate flower; filaments villous below; samaras glabrous, the wings 

 spreading at right angles to the stalk, scarlet when full grown; as the fruit ripens, 

 the peduncle turns upward and finally the samara stands erect above the leaf. 



