EUPHORBIACEAE. 215 



3. C. melanadenia (Torr.) Millsp. Cinereous with a dense soft 

 pubescence, much branched from the base, the branches ascending, 

 forming tufts; root simple, somewhat lignescent, but apparently 

 annual; leaves mostly ovate, short-petioled, usually oblique at 

 base, one side being somewhat cordate; stipules minute, ciliate, 

 distinct; involucres solitary; gland purple, its appendages with a 

 white or rose-colored margin; capsule densely hirsute. {Euphorbia 

 poly car pa ve stilus Wats.) 



Common in the chaparral belt of the San Gabriel and Santa Ana 

 Mountains. 



4. C. ocellata (Dur. & Hilg.) Millsp. Annual, prostrate, the 

 branches 10-25 cm. long, glabrous; leaves 2-4 mm. long, deltoid 

 to ovate-oblong, often cordate, thickish, entire, and revolute; in- 

 volucre 2 mm. long, its lobes fringed; glands usually 4, yellowish 

 or purplish, short-stipitate, rounded and discoid, usually without a 

 margin; capsule 2 mm. long; seeds smooth or obscurely rugose. 



Interior valleys of central California southward to southern 

 California; Colton, Parish. 



5. C. serpyllifolia (Pers.) Small. Glabrous, annual; stems pros- 

 trate or ascending, 1-3 dm. long; leaves mostly oblong, often nar- 

 rowed toward the oblique base, serrulate at the rounded or retuse 

 summit, 4-12 mm, long; stipules distinct, setaceous or lacerate; in- 

 volucres solitary or in loose leafy clusters, campanulate, about 1 mm. 

 long; glands small, greenish, the margin narrow, crenate; capsule 

 angled, 2 mm. long; seeds sharply 4-angled, the sides somewhat 

 rugose. 



Rather frequent throughout our range in moist places, especially 

 on borders of ponds. 



6. C. nutans (Lag.) Small. Annual, glabrous or sparingly pubes- 

 cent; stems branched, ascending or erect, 2-6 dm. long, branches 

 often recurved at the ends; leaves opposite, oblong-ovate to 

 linear-oblong, oblique, 3-nerved, unequally serrate, short-petioled; 

 stipules triangular, slightly lacerate; involucres narrowly obovoid, 

 1 mm. long; glands subtended by small rounded reddish appendages; 

 capsule glabrous; seeds oblong-ovoid, 1.5 mm. long, 4-angled, trans- 

 versely rugose. 



A local species, probably introduced from the Southern States, 

 known only from near Santa Ana, Helen Geis. 



6. TITHYMALUS Adans. 



Annual or perennial herbs or shrubs, with simple or 

 branched stems topped by several-rayed umbel-like 

 cymes. Leaves below the umbel usually scattered or 

 alternate, without stipules. Bracts of the umbel quite 

 different from the stem leaves. Involucres with often 

 toothed lobes. Glands 4, transversely oblong, reniform 

 or crescent-shaped by the horn-like appendages. {Eu- 

 phorbia in part.) 



