SPURGE FAMILY 39 



19. Euphorbia micromera Boiss. Desert Spurge. Fig. 3051. 



Euphorbia micromera Boiss. ex Engelm. in A. DC. Prod. IS'': 44. 1862. 

 Euphorbia pseudoserpyllifolia MiWsp. Pittonia 2: 87. 1890. 



Chatnaesyce micromera Wooton & Standley, Contr. U.S. Nat. Herb. 16: 144. 1913. 

 Euphorbia podagrica I. M. Johnston, Univ. Calif. Pub. Bot. 7: 440. 1922. 



Annual, herbage glabrous to pubescent ; stems prostrate, 12-25 cm. long. Leaves 2)-7 mm. 

 long, ovate to oblong, inequilateral, entire ; stipules triangular, ciliate, dorsal distinct, ventral 

 often united toward stem-tip ; cj'athia solitary ; involucres 1 mm. in diameter, very short- 

 campanulate; glands circular or slightly transversely oval, 0.1-0.15 mm. in diameter, exappen- 

 diculate or rarely with rudimentary appendages ; fifth gland absent ; sinus broadly V-shaped, 

 little depressed, hairy ; staminate flowers 2-5 ; capsule sharply 3-angled, globose, glabrous to 

 glabrate, 1.2-1.4 mm. long; seeds brownish white, 1.1-1.3 mm. long, narrowly ovate, sharply 

 quadrangular, facets smooth or faintly wrinkled. 



Occasional on sandy desert flats, Lower Sonoran Zone; Inyo County south to Imperial County, California, 

 east to Utah and Coahuila. Type locality: Rio San Pedro, Cochise County, Arizona. May-Nov. 



20. Euphorbia Abramsiana L. C. Wheeler. Abrams' Spurge. Fig, 3052. 



Chamaesvce saltonensis Millsp. in Parish, Cat. PI. Salton Sink 6. 1913. Preprint from Carnegie Inst. Wash. 

 Pub. No. 193: 110. 1914. (Nomen nudum.) 



Euphorbia Abramsiana L. C. Wheeler, Bull. S. Calif. Acad. 33: 109. 1934. 



Euphorbia pediculifera var. Abramsiana Ewan ex Jepson, Fl. Calif. 2: 427. 1936. 



Annual, stems prostrate, slender, 8-25 cm. long, finely pubescent. Leaves shortly puberulent 



to glabrous, 2-12 mm. long, oblong to elliptic-oblong, entire or some serrulate ; stipules distinct ; 



cyathia solitary; involucres turbinate, 0.6-0.7 mm. in diameter; glands transversely elongate, 



0.05-0.1 mm. long; fifth gland filiform; sinus V-shaped, not depressed; appendages mostly wider 



than the glands; staminate flowers 3-5; capsule glabrous, sharply 3-angled, globose, 1.3-1.7 



mm. long; seeds white, 1-1.4 mm. long, oblong-ovate, sharply quadrangular, facets with 4-6 



irregular transverse ridges slightly including the angles. 



On the arid desert. Lower Sonoran Zone; Imperial County, California, south to Lower California, east to 

 Arizona and northern Sinaloa. Type locality: Heber, Imperial County, California. June-Oct. 



21. Euphorbia glyptosperma Engelm. Ridge-seeded Spurge. Fig. 3053. 



Euphorbia glyptosperma Engelm. Bot. Mex. Bound. 187. 1859. 

 Euphorbia Greenei Millsp. Pittonia 2: 28. 1890. 

 Chamaesyce glyptosperma Small, Fl. S.E.U.S. 712, 1333. 1903. 

 Chamaesyce Greenei Rydb. Fl. Rocky Mts. 544, 1063. 1917. 



Annual, herbage glabrous ; stems prostrate, 6-30 cm. long. Leaves oblong to linear-oblong, 

 often falcate, inequilateral, usually serrulate, 3-15 mm. long; stipules distinct, linear, entire or 

 few-branched ; cyathia solitary ; involucres slenderly campanulate, glabrous, 0.6-0.9 mm. in 

 diameter; glands transversely oblong, 0.15-0.4 mm. long; fifth gland of 1-3 long, linear segments; 

 sinus narrowly U-shaped; appendages narrow, slightly wider than the glands, white, glabrous, 

 subentire to crenate ; staminate flowers mostly 4; capsule 1.4-1.7 mm. long, sharply 3-angled, 

 glabrous, broadly ovoid; seeds white to brownish, 1.1-1.3 mm. long, ovate-truncate, sharply 

 quadrangular, angles sharp, included by the several transverse ridges of the facets. 



Occasional in the valleys, Lower and Upper Sonoran Zones; Washington to northern California, British 

 Columbia east to New Brunswick, south to Texas. Type locality: Fort Kearney, Kearney County, Nebraska. 

 June-Sept. 



22. Euphorbia serpyllifolia Pers. Thyme-leaved Spurge. Fig. 3054. 



Euphorbia serpyllifolia Pers. Syn. PL 2: 14. 1806. 



Euphorbia occidentalis E. R. Drew, Bull. Torrey Club 16: 152. 1889. 



Euphorbia serpyllifolia Pers. var. rugulosa Engelm. ex Millsp. Pittonia 2: 85. 1891. 



Chamaesyce serpyllifolia Small, Fl. S.E.U.S. 712, 1333. 1903. 



Euphorbia novomexicana L. C. Wheeler, Bull. S. Calif. Acad. 35: 129. 1936. 



Annual, herbage glabrous ; stems usually prostrate, 5-35 cm. long. Leaves ovate, oblong, 



obovate, narrowly oblong, linear-oblong, or oblong-lanceolate, inequilateral, 3-14 mm. long, 



usually serrulate toward the apex ; stipules distinct, linear, entire or few-parted ; cyathia solitary, 



involucres narrowly campanulate, glabrous, 0.8-1 mm. in diameter ; glands transversely oblong, 



0.2-0.5 mm. long ; fifth gland long, linear, entire, hairy below ; sinus U-shaped, slightly depressed ; 



appendages narrow, white, glabrous, entire to bluntly toothed; staminate flowers 5-18; capsule 



1.5-1.9 mm. long, sharply 3-angled, glabrous, broadly ovoid; seeds clay-white to brownish, 1-1.4 



mm. long, oblong-ovate to narrowly ovate, ovoid-quadrangular to sharply quadrangular, angles 



rounded, facets often convex, smooth to rugulose. 



Flats and open canyon bottoms. Lower and Upper Sonoran and Transition Zones; Washington, Oregon, and 

 California, British Columbia east to Michigan, south to Texas. Type locality: "Hab.[itat] in Amer.[ica] 

 calidiore." May-Nov. 



Euphorbia serpyllifolia var. hirtula (Engelm.) L. C. Wheeler, Proc. Biol. Soc. Wash. 53: 11. 1940. 

 (£. hirtula Engelm. Bot. Calif. 2: 74. 1880.) More or less villous; leaves always broad. 3-10 mm. long. Mostly 

 in the pine belt. Transition Zone; central Sierra Nevada, Santa Lucia, San Bernardino, San Jacinto, and 



Cuyamaca Mountains, California, soutli to northern Lower California. Type locality: Talley's Ranch, Cuyaniaca 

 Mountains, San Diego County, California. June-Sept. 



