36 EUPHORBIACEAE 



11. Euphorbia Cyparissias L. Cypress Spurge. Fig. 3043. 



Euphorbia Cyparissias L. Sp. PI. 461. 1753. 



Tithymalus Cyparissias Scop. Fl. Cam. ed. 2. 1:339. 1772. 



Esula Cyparissias Haw. Syn. PI. Succ. 155. 1812. 



Calarhoeus Cyparissias Small ex Rydb. Fl. Prairies & Plains 520. 1932. 



Glabrous erect perennial 10-30 cm. tall; stems several, with densely leafy sterile branches 

 below the umbel ; rays 15-20, slender, 1-5 cm. long, 1-3 times dichotomous. Subterranean leaves 

 scale-like, grading upward into the linear, entire, aerial stem-leaves 1-2 cm. long ; umbel-leaves 

 oblong-lanceolate, broadly sessile, about 1 cm. long; floral leaves yellowish green, reniform- 

 cordate, entire, sessile; involucres glabrous, 2 mm. in diameter, turbinate-campanulate ; glands 

 semi-crescentic, 1.2-1.5 mm. long with short divergent horns, otherwise entire; fifth gland 

 short, tomentose; sinus U-shaped, little depressed; staminate flowers 5-18; capsule rugulose, 

 glabrous, 3 mm. long, depressed-globose, roundly 3-lobed ; seeds brown or whitish, 2 mm. long, 

 broadly oblong-cylindrical, smooth. 



A garden escape, introduced from Europe; roadsides and waste places, Pullman, Washington. Type locality: 

 Europe. May-Sept. 



12. Euphorbia platysperma Engelm. Flat-seeded Spurge. Fig. 3044. 



Euphorbia platysperma Engelm. Bot. Calif. 2:482. 1880. 

 Euphorbia cremica Jepson, Man. Fl. PI. Calif. 600. 1925. 



Annual with glabrous herbage; stems prostrate, 10-20 cm. long, slightly glutinous. Leaves 

 6-12 mm. long, oblong, often mucronulate, slightly inequilateral, entire ; stipules mostly distinct, 

 2-3-divided; cyathia solitary, involucres glabrous, turbinate, 1.5-1.75 mm. in diameter, glands 

 1 mm. wide, mostly radially elongate, sometimes emarginate, facing obliquely outward, exappen- 

 diculate; fifth gland subulate, short, glabrous; sinus U-shaped, slightly depressed; staminate 

 flowers mostly 50; capsule rotund-ovoid, slightly 3-lobed, glabrous, 4 mm. long; seeds white, 

 3 mm. long, oblong, back rounded, face with 2 smooth, flat, nearly approximate facets separated 

 by the elevated raphe, apex with an inflexed mucro. 



Rare, sandy desert, Lower Sonoran Zone; Colorado Desert, California, east to southwestern Arizona (?) or 

 Sonora. Type locality: "Near the mouth of the Colorado River, Arizona." May. 



13. Euphorbia ocellata Dur. & Hilg. Valley Spurge. Fig. 3045. 



Euphorbia ocellata Dur. & Hilg. Journ. Acad. Phila. II. 3: 46. 1854. 

 Chamaesyce sulfurea Millsp. Field Mus. Bot. Ser. 2: 405. 1916. 

 Chatnaesyce ocellata Millsp. op. cit. 410. 



Annual with glabrous herbage; stems prostrate, to 20 cm. long. Leaves 5-12 mm. long, 

 ovate-deltoid-falcate, inequilateral, margin revolute, entire ; stipules mostly distinct, linear, entire 

 or parted; cyathia solitary; involucres glabrous, turbinate to campanulale, 1.5-2 rnm. in diam- 

 eter; glands circular or slightly radially oval, 0.5-0.75 mm. in diameter, exappendiculate ; fifth 

 gland linear, long; staminate flowers 40-60; capsule deeply roundly 3-lobed, 2-2.3 mm. long, 

 glabrous, depressed-globose, smooth ; seeds white to brownish, ovoid, 1 . 3-1 . 5 mm. long, smooth 

 to rugose. 



Common on dry flats, Lower Sonoran Zone; Sacramento, San Joaquin and Salinas Valleys and near San 

 Bernardino, California. Type locality: Poso Creek, Kern County, California. May-Sept. 



Euphorbia ocellata var. arenicola (Parish) Jepson, Man. Fl. PI. Calif. 600. 1925. (JB. arenicola Parish, 

 Erythea 7:93. 1899.) Glabrous; leaves 8-17 mm. long, ovate-lanceolate, not at all or very slightly falcate, 

 acuminate; glands exappendiculate, seeds always very smooth. Occasional on the sandy desert, Lower Sonoran 

 Zone; eastern Mojave Desert, California, east to Utah and Arizona. Type locality: Camp Cady, Mojave Desert, 

 San Bernardino County, California. 



Euphorbia ocellata var. Rattanii (S. Wats.) L. C. Wheeler, Bull. S. Calif. Acad. 33: 107. 1934. 

 (£. Rattanii S. Wats. Proc. Amer. Acad. 20: 372. 1885.) Habit as in the typical species but the plant pubes- 

 cent; glands often with narrow white appendages. Rare in dry flood beds of creeks. Lower Sonoran Zone; 

 lower Stony Creek drainage, Tehama and Glenn Counties, California. Type locality: Stony Creek, Glenn 

 County, California. 



14. Euphorbia Parryi Engelm. Drift Spurge. Fig. 3046. 



Euphorbia Parryi Engelm. Amer. Nat. 9:350. 1875. 



Euphorbia flagelliformis Engelm. in Brandg. Bull. Geol. Geogr. Surv. Terr. 2: 243. 1876. 



Chamaesyce Parryi Rydb. Bull. Torrey Club 40: 53. 1913. 



Annual, glabrous; stems spreading or erect, 5-32 cm. long. Leaves 5-22 mm. long, linear, 

 entire, equilateral, shortly petiolate; stipules distinct, linear, entire or parted; cyathia long- 

 peduncled; involucres campanulate, 1.5-1.75 mm. in diameter; glands 0.3-0.5 mm. long, trans- 

 versely oval, cupped ; fifth gland linear, equaling the other glands ; sinus very broadly U-shaped, 

 not depressed; appendages narrow, white, glabrous, entire, margining all except the inner side 

 of the gland, ascending ; staminate flowers 40-55 ; capsule deeply 3-lobed, pblate-spheroid, 2 mm. 

 long; seeds mottled brown and white, 1.8 mm. long, narrowly ovate, ovoid-triangular. 



Sandy desert, Upper Sonoran Zone; eastern Mojave Desert, San Bernardino County, California, east to 

 Colorado, south to Chihuahua. Type locality: St. George, Utah. May-Aug. 



