514 



COMPOSITE. 



herbage at first whitish-tomentose, later more or less glabrate; lower 

 leaves pinnately divided into 5 to 9 narrowly linear revolute lobes, 

 the upper with only 3 lobes (the middle one several times larger), or 

 the uppermost entire; heads 7 lines high; involucre broadly turbinate, 

 the bracts linear with attenuate tips, dorsal ly carinate below; rays 

 about 13, the ligules 5 lines long; achenes linear, canescent, 2 lines 

 long. 



Dry stream beds, in late summer or autumn: Putah Creek; Conn 

 Creek (Napa Co.); and southward to the Mt. Diablo Eegion and 

 Southern California. 



9. S. mikanioides Otto. Ivy Senecio. Climbing by twining 

 stems over shrubs and trees to a height of 5 to 20 ft.; leaves ivy-like, 

 roundish-cordate, sharply 5 to 7-angled; petioles as long or longer; 

 stipules reniform, present except on the uppermost leaves; corymbs 

 more or less paniculate; heads linear-oblong, 5 to 7 lines long, the 

 involucre about £ the length of the corollas. 



Along streams at the western base of the Oakland Hills: Berkeley; 

 Temescal Creek; Mills College. Jan. Introduced from South Africa. 



Tribe 4. Anthemideae. Mayweed Tribe. 



28. ANTHEM IS L. Chamomile. 



Branching ill-scented herbs with finely dissected alternate leaves. 

 Heads solitary, on terminal peduncles. Ray-flowers white, pistillate, 

 in ours sterile; disk-flowers yellow. Involucre hemispherical, its 

 bracts scarious, margined with a greenish nerve, at length dry, 

 imbricated in several series, shorter than the disk. Receptacle 

 conical, chaffy toward the summit, the chaff slender, keeled and 

 scarious-margined below. Achenes striate, not hairy, truncate. 

 Pappus none. (Ancient Greek name of the Chamomile.) 



1. A. Cotula L. Mayweed. Branching from the base, 1 to 2 or 

 rarely 3 ft. high, nearly glabrous; leaves pinnately dissected; heads 

 on long naked peduncles, f in. broad, including the rays; rays 14 to 

 20, at length reflexed; achenes rugose, the truncate summit with a 

 very short epigynous disk. 



Very common late spring or summer weed in pastures and neg- 

 lected lands throughout California. Often called "Dog-fennel;" 

 odor strong and fetid. 



29. ACHILLEA L. Yarrow. 



Perennials herbs with alternate leaves, in ours pinnately divided 

 into many fine segments. Heads in a terminal corymb, radiate; rays 

 few, white; disk-flowers yellow; both disk and ray fertile. Involucre 

 oblong or ovoid, its bracts imbricated, with scarious margins. 

 Receptacle chaffy, nearly flat. Achenes strongly obcompressed, 

 callous-margined, destitute of pappus. 



1. A. millefolium L. Common Yarrow. Milfoil. Stems sim- 

 ple, erect or ascending at the very base, 2 to 3 ft. high; herbage 



