444 



ANACARDIACEAE 



9-celled; ovules erect. Fi-uit a drupe. — Genera 3, species 5, North and South 

 America, Europe, Asia. 



1. EMPETRUM 1.. 



Stems Avitli numerous branchlets crowdt'd witli leaves. Flowers inconspicuous, 

 solitary in the axils, scaly-braeted. Sepals and petals mostly 3. Staminate flower 

 with 3 stamens. Pistillate flower with the stij^ma 6 to 9-parted into radiating? lobes. 

 Drupe black, berry-like, containinj^ G to 9 nutlets. — Species 2, North and South 

 America, Europe, Asia. (Greek en, upon, and 

 petros, a rock.) 



1. E. nigrum L. Black Crowberry. (Fig. 

 222.) Stems 6 to 15 inches long, procumbent; 

 leaves 1 I/O to 2 V2 lines long; drupe 3 to 4 lines ii ii « <;^spy< ^ 



Ion*" 1 W / '^■''^.i '.^^^ 



Forming dense beds in rockv places, 1 to /\ Ufts ?v^^^ r^^ .-■''k^ 



50 feet : Del Norte Co. North to Alaska and MW A^Sl;^'^ 



British America, east to New England. Eu- vM^ fplp'^'^''''' 

 rope, Asia. Apr. ^^ f;;;^^-^,^ 



hoes.— Crescent City, T. Howell. Alas.: Iliuliuk, b // '''^J'.m ^^) 



Unalaska, Jcpson 37. ^1/ .^v-^%^ 



Eefs.—EMPETRUM NIGRUM L. Sp. PI. 1022 (1753), W*^ t-?'i^i'@ 



type European; Jepson, Man. 752 (1925). ^^ 1;^^^% 



ANACARDIACEAE. Sumac Family ^«^ ^^ 



Trees or shrubs with resinous or milky acrid ™j- „ ^^^;pp» ^-m^ r 



juice and alternate leaves. Flowers very small, ""^ <^s^^^ 



regular, either perfect or polygamous. Calyx jpiA n 

 commonly 5-parted, a glandular ring or cup- ^^ ( ^1 



like disk lining its base. Petals commonly 5, ^^ e 



the stamens as many or twice as many. Ovary 

 free from the calyx and from the disk, 1-celled, . ^'^^■. ^^^^ Empetrum nigrum L. a 

 ^ , , . 1 T-i -^ T 1 T1 flowering branch, X 72; 0, staminate 



1-OVUled; styles 3. Fruit a dry berry-like fl. with a petal and a sepal removed, X 

 drupe; seed without endosperm. — Genera 58, 5; c, pistillate fl., X 5; d, long. sect, of 

 species 500, all continents, tropical and sub- pistil, X 5; e, fr., X 2. 

 tropical. 



Bibliog. — Engler, A., Anacardiaceae (DeCandolle, Monog. Phan. 4:172-500, tabs. 4—15, — 

 1883). Greene, E. L., Segregates of the genus Rhus (Lflts. 1:144,-1905). McNair, J. B., 

 Secretory canals of Rhus diversiloba (Bot. Gaz. 65:268-273, — 1918) ; A stud}' of Rhus diversi- 

 loba with special reference to its toxicity (Am. Jour. Bot. 8:127-146, figs. 1 and 2, and pi. 2, — 

 1921) ; The transmission of Rhus poison from plant to person (I.e. 238-250, — 1921) ; Rhus 

 dermatitis, its pathology and chemotherapy, 1-298, pis. 1-3 and figs. 1-14, — 1923 ; Taxonomy of 

 Poison Ivy (Field Mus. Publ. Bot. 4:55-78, — 1925) ; Taxonomy and range of Poison Ivy (Sci. 

 61:589,-1925). 



1. RHUS L. Sumac 



Shrubs or small trees. Leaves (in ours) simple or 3-foliolate. Stamens 5. 

 Drupe flattened, with rather thin and dry flesh. — Species 120, all continents, tem- 

 perate and subtropical regions. (Greek rhous, the name of Theophrastus for the 

 sumac. ) 



Leaves 3-foliolate; deciduous shrubs; throughout Cal. 



Flowers greenish, in panicles; drupe whitish, the stone rough 1. B. diversiloba. 



Flowers yellowish, in spikes; drupe red, the stone smooth 2. R. trilohata. 



Leaves simple, leathery ; evergreen shrubs ; flowers in panicles ; S. Cal. 



Panicle much branched, with slender divisions, glabrous or nearly so ; drupe whitish 



Panicle composed of stout spikes, finely pubescent ; drupe red. 



Leaf-blades elliptic, rounded at apex 4. B. integrifolia. 



Leaf -blades ovate, acute or acuminate 5. B. ovata. 



