262 



EUPHORBIACE^:. 



Herbage often hairy or puberulent; leaves commonly margined with a 

 red or with a central red spot. 



Stipules lanceolate, fimbriate 2. E. maculata. 



Stipules triangular, slightly lacerate 3. E. hyptrici folia. 



Stems erect; leaves larger, stipules none; no colored margins to the glands. 

 Stem-leaves alternate. 

 Glands disk-like, entire; capsule with warty lobes . ..5. E. dictyosperma* 

 Glands crescent-shaped, 2-horned; capsule smooth. . .6. E Uptocera. 

 Stem-leaves in 4 ranks; glands crescent-shaped . . . . 7. E. Lathyris. 



1. E. serpyllifolia Pers. Thyme-leaved Spurge. Stems round, 

 or more or less angled, repeatedly branched, forming prostrate mats 

 1 to 3 ft. across; herbage glabrous and green; leaves oblong or obovate- 

 spatulate. unequal at base, more or less minutely serrate toward the 

 apex; stipules setaceous or lacerate; involucre \ line long or less; 

 glands transversely oblong and more or less cupped in the center; 

 appendages narrow, crenately serrate or nearly entire; seeds sharply 

 quadrangular, slightly rugose or more manifestly so and thus appear- 

 ing shallow-pitted. 



Stream beds and low grounds in the Coast Range region (Santa 

 Clara; Santa Rosa), and from Putah Creek and the Sacramento River 

 southward. Aug. -Oct. 



Var. consanguinea Boiss. Herbage with more or less red colora- 

 tion; stems more erect; apex of leaves sharply serrate; lobes of the 

 involucre lacerate; seeds less sharply angled. — Upper Sacramento 

 Valley: Napa V.alley. 



Var. rugulosa Engelm. (E. rugulosa Greene). Plants more 

 thickly matted; leaves more serrate on the larger side of the unequal 

 leaf; seeds finely rugulose. — Suisun; Berkeley. 



Var. occidentalis (E. occidentalis Drew). Herbage dull yellow- 

 ish green; appendages of the involucre crenately lobed; seeds sinuate- 

 rugose. — Humboldt Co. and Mt. St. Helena. 



2. E. maculata L. Spotted Spurge. Herbage hairy or puber- 

 ulent; stems radiately branching, prostrate; leaves oblong-linear, 

 usually with a red blotch in center, serrulate, subcordate at base; 

 stipules fimbriate; involucre with 4 cup-shaped glands; capsule 

 acutely angled; seeds transversely wrinkled, and minutely pitted. 



Occurring as an immigrant from the eastern U. S. acc. to Greene. 



3. E. hypericifolia L. Larger Spurge. Glabrous or sparingly 

 hairy, ascending or sometimes prostrate, the branches f to \\ ft. long; 

 leaves ovate-oblong to oblong-linear, 3-nerved, unequally serrate, 

 commonly with a red spot or red margins; stipules triangular, 

 slightly lacerate; peduncles longer than the petioles; appendages 

 of the involucre white or red, entire; capsule glabrous, obtusely 

 angled; seeds with broken transverse ridges. 



introduced in Napa Valley along the railroad track. Specimens 

 determined by C. F. Millspaugh. 



4. E. ocellata Dur. & Hilg. Annual, prostrate, the branches 

 5 to 9 in. long; leaves thickish, deltoid to ovate-oblong, often cordate 

 at base, entire, 2 to 4 lines long; involucre campanulate, nearly 1 line 

 long, its lobes fringed; glands 2 to 4, yellowish or purplish, short- 



