92 TITHYMALOIDE^. 



Habit of the last, but the glabrous herbage of a dull rather yellowish 

 green : leaves oval or broadly oblong, only slightly unequal, very obtuse 

 at each end, serrate above the middle or quite entire, mucronulate, 2 4 

 lines long ; stipules setaceous-lacerate : appendages of involucre crenate- 

 lobed : seed 34 line long, whitish, the faces more or less distinctly 

 sinuate-rugose between the rather prominent angles. — Humboldt Co., 

 C'hesnut & Lrev, and on Mt. St. Helena, Greene ; by streamlets and in 

 moist situations. More nearly closely allied to E. serpyUifolia than is 

 the following. 



9. E. rngnlosa, Greene. E. serpyUifolia, var. ntgulosa, Engelm. 

 Millsp. 1. c. : E. serpyUifolia, Greene, Bull. Calif. Acad. ii. 57, not of 

 Persoon. Wholly prostrate and very closely depressed, rather sl^cculent 

 (very brittle when dry), much branched and in age forming a very close 

 mat a foot broad or more : herbage glabrous, pallid and glaucescent : 

 leaves veinless, sharply serrate or almost entire : stipules, involucre, etc. 

 as in the preceding : seeds whitish, finely and transversely rugose 

 between the scarcely prominent angles. — Native of the southern extremity 

 of the State, but well established along the railroads in our district, even 

 at Dwight Way Station, Berkeley, where it has appeared annually since 

 1886. Totally unlike the preceding species in aspect, the very earliest 

 branches lying flat upon the ground, and taking a peculiar zigzag course 

 in their growth ; the stem lacking fibrous tissue, very excessively milky- 

 juicy, the herbage peculiarly pallid. June— Oct. 



10. E. humistrata, Engelm. in Gray Man. 3d ed. 386 (1859). Annual, 

 prostrate, slender, the branches hirsvite-piibescent : herbage dark green 

 or purplish : leaves obovate or elliptical, very oblique at base, serrulate 

 above the middle, 3 — 4 lines long, marked with a brown spot above ; 

 stipules lanceolate, fimbriate : involucre cleft on the back, its red or 

 white appendages truncate or crenate : pods sharply angled, puberulent: 

 seed }4 liii6 long, ovate, obtusely angled, minutely rugose-roughened. — 

 Near lone, collected only by the author ; common eastward, in the 

 valley of the Mississippi. 



11. E. Preslii, Gussone, Prodr. Fl. Sicul. i. 539 (1827) : E. hyperiei- 

 folia, Engelm. not of Linn. Erect or ascending, branched from the base, 



1 — 2 ft. high, glabrous or sparsely pubescent : leaves oblong-linear, often 

 more or less falcate, serrate, 3^ — 1}4 in. long, often with a dark spot ; 

 stipules triangular : peduncles longer than the petioles, collected in leafy 

 cymes toward and at the summits of the branches : appendages of 

 involucre white or reddish, entire : seed % line long, obtusely angled, 

 wrinkled and tuberculate, dark-colored. — In the upper Sacramento 

 valley, by I'oadsides ; not frequent, perhaps recently arrived from the 

 eastern states where it is a common weed. 



