428 EUPHORBIACEAE 



Man. 600 (1925). Euphorbia arenicola Parish, Erythea 7:93 (1899), type loc. Camp Cady, 

 Mohave Desert, Parish 1370. Chamacsycc arenicola Millsp. I.e. 408. Var. sulfurea Jepson. 

 Chamaesyce sulfurea Millsp. I.e. 405, type loc. hills near Big Chico Creek, Butte Co., Heller 11,140. 

 Var. R.\TTANII Jepson. Euphorbia rattanii Wats. Proc. Am. Acad. 20:372 (1885), type loc. 

 Stonv Creek, nw. Glenn Co. (formerly part of Colusa Co.), Rattan. Chamaesyce rattanii Millsp. 

 I.e. 411. 



9. E. eremica Jepson. Desert Spurge. Stems few or several from the base, 

 prostrate, slijrhtly g^landular, 4 to 8 inches lonj:?; herbage yellowish-green, glabrous; 

 leaf -blades oblong-elliptic, obtuse, entire, 2 to 5 lines long; stipules fimbriate; in- 

 volucres turbinate-cylindric, the glands saucer-shaped with the margin produced 

 outwards into 2 acute ciliate or fimbriate lobes or horns; capsules obtusely angled, 

 li/'Q lines long; seeds ellipsoid, round on the back, flattish on the face, very smooth, 

 clay-white or ashy-pink, IV^ lines long. 



Sand}"- plains, 200 feet : Concliilla Desert, K-iverside Co. May. 



Eef. — Euphorbia eremica Jepson, Man. 600 (1925), type loc. Conchilla Desert, Jepson 6047. 



10. E. albomarginata T. & G. Rattlesnake Weed. Stems numerous from 

 a branched often woody root-crown, slender, prostrate or decumbent, 2 to 12 inches 

 long; herbage glabrous; leaf -blades nearly orbicular to round-ovate, 2 to 4 lines 

 long, margined with a thin whitish extremely narrow edge, often refuse; stipules 

 united into a conspicuous membranous white triangular scale, entire or slightly 

 lacerate; involucres mostly solitary, nearlj^ 1 line long; glands 4, orange or brown- 

 ish, the appendages conspicuous, white or rose-color, entire or undulate, ^ line 

 long; capsules smooth, nearly 1 line long, the lobes angled on the back; seeds oblong, 

 4-angled, whitish, minutely embossed, % line long. 



Plains, mesas and rocky slopes, 400 to 7500 feet: coastal Southern California; 

 Colorado and Mohave deserts; Kern and Inyo Cos. East to Texas, south to Mexico. 

 Mar.-Oct. 



Locs. — Bishop, Almeda Nordylce; Emigrant Sprs., Panamint Eange, Parish 10,086; Hanau- 

 pah Canon, Panamint Eange, Jepson 7000; Bakersfield, Kern Co., Davy 1937; Coolgardie, n. 

 of Daggett, Jepson 4824; Kessler Peak, Ivanpah Mts., e. Mohave Desert, Jepson 15,829; Palo 

 Verde Valley, Jepson 5261 ; Eock Creek Canon, San Gabriel Mts., Peirson 459 ; Ft. Yuma, Jepson 

 11,734; Inglewood, Los Angeles Co., Abrams 2480; Eiverside, Jepson 1209; San Jacinto Valley, 

 Parish; Box Canon, Blair Valley, e. San Diego Co., Jepson 8709. 



Eefs. — Euphorbia albomarginata T. & G. Pac. E. Eep. 2:174 (1855), type loc. "head- 

 waters of the Colorado," that is, western Texas, Diffenderfer; Jepson, Man. 600 (1925). Chamae- 

 syce albomarginata Small, Fl. Se. U. S. 710, 1333 (1903). 



Euphorbia serpens H. B. K. Nov. Gen. et Sp. 2 :52 (1817), type loc. "in umbrosis Cumanae 

 prope Bordones et Punta Araya", Venezuela (cf. Sandwith, Kew Bull. 1925:295-310). Chamae- 

 syce serpens Small, Fl. Se. U. S. 709 (1903). Creep Spurge. Differing from E. albomarginata 

 mainly by the annual habit. Durmid, Salton Sink, ace. Parish (Carnegie Inst. Wash. Publ. 193: 

 110). 



11. E. polycarpa Benth. Sentenac Spurge. Stems numerous, ascending or 

 prostrate from a thick or branched root-crown, markedly leafy with minute leaves, 

 2 to 11 inches long; herbage glabrous or somewhat finely pubescent; leaf -blades 

 round-ovate or ovate to oblong, slightly cordate at base or obtuse, obtuse or acutish 

 at apex, % to 2^/^ lines long; stipules minute, lanceolate to short-triangular, ciliate; 

 involucres commonly solitary in the axils, turbinate-campanulate, i/2 to % line 

 long; glands transversely oblong, red-purple (sometimes yellow), the appendages 

 varying from conspicuous (broad, white or rose-color and somewhat crenulate) to 

 none; capsules % line long, puberulent, the lobes angled; seeds oblong, 4-angled, 

 salmon-color or ashy, I/2 line long. 



Dry hillsides or washes, -200 to 5000 feet : Inyo Co. to San Diego Co. East to 

 Arizona and Nevada, south to Lower California. Mar.-Dec. 



Locs. — Pinto basin, Virginia Dale region, Jepson 12,628; Chuckwalla wash, e. Eiverside Co., 

 Hall 5900 ; Borrego Valley, J. T. Howell 3209 ; Wagon Wash near Sentenac Canon, e. San Diego 

 Co., Jepson 12,475; La Jolla, Newlon 312; San Diego, Harriet Kelley. The above spms. are 



