SUNFLOWER FAMILY. 515 



pubescent; leaves linear-lanceolate in outline, the multifid divisions 

 crowded on the rachis; corymh compound, flat-topped; rays 4 or 5, 

 white. 



Common throughout California: along the coast, on low interior 

 hills, and even in the most remote mountain ranges; appearing as if 

 native. Mar.-July. 



30. CHRYSANTHEMUM L. 



Annual or perennial herbs, ours with toothed or incised leaves. 

 Heads large, solitary on leafy-bracted peduncles. Disk-flowers 

 yellow; rays yellow or white. Keceptacle flat or hemispherical, 

 naked. Achenes glabrous, at least those of the disk 5 to 10-ribbed all 

 around. (Greek chrusos, gold, and anthemon, a flower.) 



1. C. segetum L. Cokn Chrysaxthemitm. Annual, erect, 1 

 to 2 ft. high; herbage glabrous; lower leaves pinnatifid or incised; 

 upper merely denticulate, sessile by a clasping base; heads (including 

 the yellow rays) 2 in. wide; ray achenes 3-sided. 



Fields at West Berkeley; Mendocino City. May-June. 



C. Letjcanthemum L. Ox-eye Daisy. Involucral bracts with 

 dark red margins; rays white. — Sierra Nevada; reported from Santa 

 Cruz. 



31. MATRICARIA L. 



Ours glabrous annuals with pinnately dissected leaves. Heads 

 solitary or somewhat corymbose, with many greenish yellow flowei-s. 

 Keceptacle slender-conical, naked. Bracts of the involucre imbri- 

 cated, with scarious margins, persistent. Corollas tubular, without 

 limb. Rays none. Pappus reduced to a membranous crown or border, 

 or none. Achenes glabrous, 3 to 5-nerved on the sides, rounded on 

 the back. (Latin matrix, because used medicinally.) 



Heads 2 to 4 lines high; achenes with an obscure margin at summit . . 



1. M. discoidea. 

 Heads mostly 4 to 6 lines high ; achenes with a broad crown, or a lobed 1- 

 sided pappus ... ... . . .2.M. occidentals. 



1. M. discoidea DC. Branching, 2 or 3 to 10 in. high; herbage 

 sweet-scented; heads short-peduncled, 2 to 3 or 4 lines high; bracts of 

 the involucre broadly oblong. 



Common in beaten roadways, about old farm buildings and in 

 pasture lands throughout California. Apr.-May. 



2. M. occidentalis Greene. Either branching or unbranched 

 below the corymbose summit, 1 J to 2 ft. high; herbage not so strongly 

 scented; heads as much as J in. high; achenes sharply angled, with a 

 broad crown-like margin, or lobed and 1-sided. 



Eich soil of fields: Sacramento Valley; San Prancisco and south- 

 ward to Southern California. 



32. TANACETUM L. 



Strong-scented perennial herbs. Leaves 2 or 3 times pinnately 

 divided into numerous small lobes. Heads discoid, many-flowered, 



