454 COMPOSITiE, 



1. M. vulgare, Hill, Brit. Herbal. 458 (1756). (Yarrow.) Stoutish, 

 1—2 ft. high, villous-lauate to nearly glabrous: beads crowded in a 

 fastigiate flat-topped cyme: involucre oblong; rays 4 or 5, white. — Very 

 common in sandy soils toward the sea; also in the mountain districts. 



91. TANACETUM, Toumefort. (Tansy.) Aromatic perennials. 

 Leaves ample, 2 — 3-pinnately dissected into very many divisions or lobes. 

 Heads discoid, erect. Receptacle naked. Flowers yellow. Anther-tips 

 broad, obtuse. Achenes truncate, and with a coroniform-dentate pap- 

 pus, or epappose. 



1. T. cainplioratum, Less, in Linnsea, vi. 521 (1831); Syn. Comp. 260 

 (1832), under OmalanUucs. Camphoric-aromatic, villous-tomentose, very 

 stout but decumbent, the stems 1 — 3 ft. long, leafy to the summit: 

 pinnae and segments of the very large leaves much crowded: heads in a 

 large corymbose cluster, short-peduncled, the low-convex disk % i^- 

 broad; achenes 4-angled. — Abundant on sand dunes near the sea, from 

 San Francisco northward. Aug. — Dec. 



2. T. potentilloides, Gray, Proc. Am. Acad. ix. 204 (1874), and I.e. 

 vi. 551 (1865), under Artemisia. Silvery-silky; the several stems mostly 

 less than a foot high, leafy chiefly at base, the upper leaves much 

 reduced and scattered; the lowest bipinnately divided and petioled; the 

 upper simply pinnate, the lobes linear, entire: heads several, in a loose 

 corymbose panicle: involucre about 34 in- broad, the bracts about 10, 

 broadly obovate, silky-tomentose: achenes 3 — 5-angled, thin and viscic- 

 ular, truncate. — Sierra Valley, Leminon, and northward, east of the 

 Sierra. 



92. ARTEMISIA, Toumefort. Bitter-aromatic herbs and low shrubs. 

 Leaves alternate. Heads discoid, small, paniculately disposed, usually 

 nodding. Flowers whitish or yellow, often sprinkled with resinous 

 globules. Anther-tips slender and pointed. Achenes obovate or oblong, 

 usually with small summit and no pappus. 



* Shrubby species, luith leaves filif or mly dissected. 



1. A. Californica, Less, in Linnsea, vi. 523 (1831). Branches ascend- 

 ing, 2 — 4 ft. high; leaves cinereous with a minute appressed pubescence, 

 terebinthine-scented, the lowest parted into a few linear filiform seg- 

 ments, the upper entire: heads many, in leafy panicles; involucre 2 lines 

 broad: achenes broadish and truncate at summit, with a squamellate or 

 coroniform-dentate pappus. — Southward and Avestward slopes of hills. 

 Sept. — Dec. 



