SUMAC FAMILY 



447 



San Luis Obispo Co., Condit; Waltham Creek, w. Fresno Co., Jepson; Miller Canon, Vaca Mts., 

 Jepson 13,915; Putah Canon, Jepson 13,918; Pope Creek, Berryessa Valley, Jepson 10,411; Conn 

 Creek, Napa Range, Jepson; Middleton grade, Mt. St. Helena, Jepson 13,914; Knoxville grade 

 to Lower Lake, Jepson 13,917 ; Hough's Sprs., ne. Lake Co., Jepson 9023 ; Cedar Flat, Trinity 

 Co., Tracy 7525; Edgewood, Siskiyou Co. (N. Am. Fauna 16:152). Sierra Nevada: Cold Spr., 

 North Fork Tule Eiver, Jepson; Cedar Creek, North Fork Kaweah River, Jepson; Fresno Flats, 

 Jepson 12,850; Mariposa Co. (Zoe 3:27) ; Duck Bar, Stanislaus River, A. L. Grant 711; Dana, 

 ne. Shasta Co., Jepson. luyo Co.: Hanaupah Canon, Panamint Range, Jepson 7038. 



Var. anisophylla Jepson. Leaves small, the lateral leaflets unequal. — Desert region from 

 the Cottonwood Mts. to the Panamint Range. 



Refs.— Rhus trilobata Nutt.; T. & G. Fl. 1:219 (1838), "in the central chain of the Rocky 

 Mountains", Nuttall; Jepson, Man. 608, fig. 603 (1925). Toxicodendron trilobatum Ktze. Rev. 

 Gen. PL 1:154 (1891). Bhus trilobata var. quinata Jepson, Erythea 1:141 (1893), tj'pe loc. 

 hills n. of Berryessa Valley, ne. Napa Co., Jepson 13,921. Schmaltzia quinata Greene, Lflts. 1 :139 

 (1905). S. malacophylla Greene, Lflts. 1 :138 (1905), type loc. Griffith Park, Los Angeles, Braun- 

 ton. S. straminea Greene, Lflts. 1:139 (1905), type loc. Lytle Creek, San Gabriel Mts., Leiherg. 

 S. cruciata Greene, I.e., type loc. Hot Sprs., n. San Diego Co., Palmer. S. anomala Greene, I.e., 

 type loc. Little Chico Creek, Butte Co., E. M, Austin. Var, anisophylla Jepson, Man. I.e. Schmal- 

 tsia anisophylla Greene, Lflts. 1 :136 (1905), type loc. Surprise Canon, Panamint Mts., Fisher 618. 



3. R. laurina Nutt. Laurel-Sumac. Mangla. Very leafy shrub, 5 to 7 

 (or 13) feet high, exhaling an aromatic odor; leaf -blades ovate or lanceolate, ab- 

 ruptly mucronate, II/2 to 5 inches long, on petioles i/4 to 1% inches long; panicle 

 conical, dense; flowers % to 1 line long; drupe whitish, very small. 



Mesas, hillslopes and valley flats, 5 to 2500 feet : cismontane Southern Califor- 

 nia, mostly near the coast. South to Lower California. June-July. 



Locs. — Santa Barbara, Abrams 4154; San Fernando, Parish 1928; Mt. Wilson, C. E. Hutch- 

 inson; lower Rubio Canon, San Gabriel Mts., Peirson 105; Avalon, Santa Catalina Isl., Jepson 

 3049; Temescal "Wash, Jepson 1579; Fallbrook, n. San Diego Co., Parish 2248; Rainbow, San 

 Diego Co., Parish 4462 ; San Diego, Palmer 48. 



Refs. — Rhus laurina Nutt.; T. & G. Fl. 1:219 (1838), type loc. Santa Barbara, Nuttall; 

 Jepson, Fl. W. Mid. Cal. ed. 2, 249 (1911), Man. 608, fig. 604 (1925). Toxicodendron laurinum 

 Ktze. Rev. Gen. PI. 1:154 (1891). Malosma laurina Nutt.; Engler in DC. Monog. Phan. 4:393 

 (1883). 



/ 



Fig. 224. Rhus integrifolia B. & W. ; variations in leaf 

 from a single shrub, X Vs. 



4. R. integrifolia B. & W. Lemonade-berry. Shrub 2 to 12 feet high, or 

 sometimes a small tree attaining 20 to 25 feet; leaf -blades elliptic, dark green, 

 leathery, entire or with a few small sharp teeth, 1 to 2^ inches long, on petioles 1 

 to 5 lines long; panicles ashy-puberulent; flowers 2 to 3 lines long; bracts, sepals 

 and petals ciliolate. 



Mesas and hillslopes, 25 to 2000 feet : cismontane Southern California. South 

 to Lower California. Dec-Apr. 



Field note. — Thickets of Rhus integrifolia are often a characteristic feature of mesas, espe- 

 cially on headlands along the coast. Such thickets, 3 to 6 feet high, are remarkably dense, form- 

 ing low rounded mounds 10 to 20 feet broad. The berries are rather strongly flattened and are 

 covered with a thin cream-like secretion that is milky in color. This secretion is used to make an 

 acid drink. 



While the leaves are typically entire, those of a single shrub may sometimes show significant 

 variations in segmentation (see fig. 224) : a marked lobe on one or both sides towards the base 

 which in other leaves are exhibited as distinct leaflets. These variants doubtless represent rever- 

 sions to the ancestral leaf type in the genus Rhus, that is, a pinnately compound structure. 



