74 EUPHORBIACEvE. Euphorbia. 



rather obtusely angled, surrounded by 4 deep transverse grooves. Bot. Mex. 

 Bound. 186; Boiss. 1. c. 48. 



Big Canon of the Tantillas Mountains (Palmer), and through Arizona (Schott, Palmer, Roth- 

 rock) to New Mexico, Wright. 



i- -i- Annuals: leaves serrulate. 



6. E. serpyllifolia, Persoon. Glabrous : stems prostrate or ascending, be- 

 coming a halt' to one foot long : leaves obovate to narrowly oblong, often narrowed 

 toward the very oblique base, denticulate (sometimes obscurely) at the rounded or 

 retuse summit, 2 to 6 lines long ; stipules distinct, setaceous or lacerate : involucres 

 solitary or in loose leafy clusters, carnpanulate, line long or less ; glands small, the 

 narrow whitish margin crenate or entire : capsule angled, a line long : seeds sharply 

 4-angled, the sides somewhat rugose and slightly pitted or sometimes nearly smooth. 

 Boiss. 1. c. 43. E. inaquilatera, Engelrn. in Bot. Mex. Bound. 187. 



A common species, especially in the Great Basin, ranging from the Columbia River to Monterey, 

 eastward to the Saskatchewan and southward to Iowa, Texas and Mexico. 



E. GLYPTOSPERMA, Engelm. (Bot. Mex. Bound. 187), is a similar species, distinguished by its 

 decidedly semicordate (the lower side produced) sharply serrulate leaves, and its seeds with 4 or 5 

 sharp transverse ridges and notched angles. It occurs on the Columbia River and eastward to 

 Wisconsin, but has not been found in California or Nevada. 



7. E. hirtula, Engelm. ined. Villous with soft spreading hairs, prostrate or 

 ascending, the stems 3 or 4 inches long : leaves very oblique, round-oval or obovate 

 to broadly oblong, serrulate toward the rounded apex, 2 or 3 lines long ; stipules 

 distinct, timbriate-setaceous : involucres solitary or in leafy clusters, deeply carnpan- 

 ulate, about equalling the pedicels ; glands minute, with a narrow crenate margin : 

 capsules somewhat villous, angled, a line long : seeds broadly ovate, 4-angled, 

 irregularly and rather faintly wrinkled or pitted. 



Near San Diego (Cleveland) ; at Talley's in the Cuyamaca Mountains, Palmer. Nearly "allied 

 to E. stictospora and E. vclligera" (Engelmann) ; distinguished chiefly by the narrower and more 

 incised stipules, and by the thicker smoother and lighter colored seeds. 



2. Shrubs, with scattered leaves, entire and not oblique at base, on slender peti- 

 oles : glands 5 : seeds ovate. TUICHEROSTIGMA, Boiss. 



8. E. misera, Benth. A much branched straggling shrub, 2 or 3 feet high : 

 young branches pubescent : leaves minutely puberulent or glabrate, solitary or few 

 upon the short brarichlets, round-obovate, obtuse or retuse, mostly cuneate at base, 

 2 to 6 lines long, exceeding the petioles ; stipules h'mbriate : involucres hemispherical, 

 solitary and terminal, a line long ; lobes short, inflexed ; glands purple, with a 

 white crenulate margin : capsules 2 lines long, with rounded lobes, somewhat warty : 

 seeds round-ovate, reticulate- wrinkled or obscurely pitted, 1^ lines long. Bot. 

 Sulph. 51 ; Boiss. 1. c. 69. 



Southern California, from Santa Barbara to San Diego, near the sea, Hinds, Nuttall, Cleveland. 



II. Glands of the involucre without a colored margin, entire or denticulate or cres- 

 cent-shaped. The folloiving sections have scattered (rarely or^posite) leaves, 

 those of the terminal cymose-corymbose inflorescence opposite or verticillate : 

 our species erect or ascending, herbaceous. 



3. Glands cup-shaped {in ours cleft on the inner side) : involucres in terminal 

 clusters : stipules gland-like, minute. POINSETTIA, Boiss. 



9. E. eriantha, Benth. Stems herbaceous and slender, ascending from a woody 

 apparently perennial base, branching, nearly a foot high, glabrous : leaves scattered 

 and distant, narrowly linear, acute or obtuse and mucronate, often 3-toothed at the 

 apex, attenuate to a short petiole, sparingly pubescent, entire, an inch or two long ; 

 the floral ones similar, opposite, much exceeding the flowers : involucres 1 to 3 at 



