MAPLE FAMILY 453 



Moist valley bottoms or along stream borders, 200 to 5000 feet : Mendocino Co. 

 to Shasta and Del Norte Cos. North to Alaska. Apr. -May. 



Locs. — Longvale, Mendocino Co., ace. M. S. Baker ; White Thorn Valley, sw. Humboldt Co., 

 Tracy 4999; South Yager Creek, Humboldt Co., Tracy 6061; Blue Lake, Humboldt Co., Blasdale ; 

 Devils Backbone, betw. Trinity Summit and Salmon Summit, Jepson ; Hurdy Gurdy Creek, Del 

 Norte Co., M. S. Baker 293; Shasta Sprs., Jepson 13,942; upper Clover Creek, near Stevens, 

 Shasta Co., M. S. Baker 402; Bear Valley Mts., Shasta Co., M. S. Baker. 



Eefs. — Acer circinatum Pursh, Fl. 267 (1814), type loc. Columbia Eiver rapids, Lewis; 

 Jepson, Silva 267, pi. 80, figs. 5-6 (1910), Man. 611, fig. 611 (1925). 



3. A. g-labrum Torr. Sierra Maple. Shrub 5 to 10 (or 14) feet high, with 

 slender branchlets; leaf -blades 1 to 3 inches broad, palmately 3-lobed or often with 

 2 supplementary lobes at base, the margin unequally serrate; flowers 4 to 9, in 

 loose umbel-like corjanbs, the staminate without rudiments of pistils and the pistil- 

 late with short stamens; corymbs unisexual or with both pistillate and staminate 

 flowers, the sexes often borne on different shrubs; stamens 7 to 10, glabrous; sam- 

 aras usually several in a cluster, glabrous, the wings ascending. 



Rocky or wet mountain slopes, 6000 to 9000 feet : San Jacinto Mts. ; San Ber- 

 nardino Mts.; desert ranges in Inyo Co.; Sierra Nevada; Humboldt Co. to Siskiyou 

 Co. North to Alaska, east to the Rocky Mts. June-July. 



Geog. note. — In the Southern California mountains, in the desert ranges and in the Sierra 

 Nevada area Acer glabrum occurs in scattered and infrequent colonies, for the most part con- 

 sisting of only a few individuals, though occasionally better developed on moist slopes in the 

 Sierra Nevada. In western Siskiyou County it assumes a different role. From Marble Mountain 

 to the region of Cuddihy Valley it is a frequent species in the high brush association, while on 

 both slopes of the Siskiyou Mountains it is common in moist hollows and often abundant at the 

 higher altitudes. It is also called Blood Maple. 



Locs.— S. Cal. mts. : Tamarack Valley, San Jacinto Mts., Hall 2602 ; Mill Creek Falls, San 

 Bernardino Mts., Parish 2510; Mt. San Bernardino, J. Grinnell. Inyo Co.: Telescope Peak, 

 Panamint Eange, Jepson; Grapevine Mts. (Contrib. U. S. Nat. Herb. 4:81). Sierra Nevada: 

 "Whitney Creek, Mt. Whitney, Jepson; Kern-Kaweah River, Jepson; Atwell Mill, East Fork 

 Kaweah River, Jepson ; Bubljs Creek, Fresno Co., Jepson 805 ; Illilouette Trail, Yosemite, Jep- 

 son 5676 ; Stubblefield Canon, Tuolumne Co., Jepson 4532 ; Cascade Creek, upper Stanislaus 

 River, Jepson 6529; Glen Alpine, Eldorado Co., Otiley 791; King Creek, Lassen Co., Jepson; 

 Gold Run, Susanville, Jepson. North Coast Ranges: Trinity Summit, Davy 5780; Bear Creek, 

 Trinity Co., E. S. Yates 476; Grizzly Creek, Trinity Co., Alexander 4- Kellogg; Marble Mt., 

 Jepson 2837; Cuddihy Valley, w. Siskiyou Co., Jepson. 



Refs. — Acer glabrum Torr. Ann.' Lye. N. Y. 2:172 (1828), type collected by Edwin James 

 in the "Rocky Mts."; Jepson, Silva 268, pi. 80, figs. 3-4 (1910), Man. 612, fig. 612 (1925). 



4. A. negundo L. var. californicum Sarg. Box Elder. Tree 20 to 60 feet 

 high; leaves pinnately 3-foliolate, the leaflets li/4 to 5 inches long, serrate and in- 

 cised, or deeply 2 or 3-lobed, or the lobes sometimes becoming distinct and petiol- 

 uled so that one or more of the primary leaflets is replaced by 2 or 3; staminate 

 flowers clustered on thread-like hairy pedicels, the stamens 4 or 5; pistillate flowers 

 borne in slender racemes; samaras straw-white, crimson when young, finely pu- 

 bescent. 



Along streams and in low moist valley bottoms, 5 to 5200 feet : mountains of 

 coastal Southern California; Coast Ranges; Sacramento Valley. Mar.- Apr. 



Locs.— S. Cal.: Santa Rosa Mts., Clary 1157; Pipe Creek, San Jacinto Mts., Muns 5804; 

 Edgar Canon, San Bernardino Mts., Parish 4148; Yueaipa, San Bernardino Mts. (Zoe 4:341) ; 

 Santa Barbara, Dunn. Tehachapi Mts.: Canada de las Uvas (Contrib. U. S. Nat. Herb. 4:81). 

 Coast Ranges: Arroyo Grande, San Luis Obispo Co., Brewer 433; Nacimiento River, Monterey 

 Co., Brewer 536 ; Santa Cruz, Jepson 2256 ; Bradley, Salinas Valley, J. T. Howell 3006 ; Pescadero, 

 San Mateo Co., Jepson; San Leandro Creek, Alameda Co., Jepson; Walnut Creek, Contra Costa 

 Co., Jepson 3084 ; San Anselmo, Marin Co., Jepson 8263 ; Olema, Marin Co., Jepson 4032 ; Dun- 

 cans Mills, Sonoma Co., Davy 1656; Putah Canon, Jepson; Ukiah, Jepson 4007; Yreka Creek, 

 Siskiyou Co., Butler 1617. Great Valley: Walnut Grove (Erythea 1 :242) ; Harding Ldg., Sutter 

 Co., Jepson 13,937. 



Refs. — Acer negunbo L. Sp. PL 1056 (1753), type from Va. Var. californicum Sarg. 

 Gard. and For. 4:148 (1891), Silva 2:112, t. 97 (189i) ; Jepson, Fl. W. Mid. Cal. 252 (1901), 



