soliva COMPOSITE 363 



COTD LA 



equal bracts in not more than 2 series. Receptacle flat, naked. 

 Achenes obcompressed, with rigid wings or callous margins 

 which are commonly spinulose -pointed at summit and the 

 apex armed by the spiniform persist*- nt style. Pappus none. 



S. sessilis Ruiz & Pav. 1. c. Villous or the leaves glabrate : stems 

 slender, 2-4 inches high, branched : leaves thrice divided, primary divisi- 

 ons 2-5, petiolate, parted into 3-5 narrow lanceolate lobes : heads depressed . 

 achenes broadly obovate, ihin-winged, spinulose-pointed at the summit, in 

 some the wings reduced to an acute margin: style persistent, long and 

 stout. Moist ground near the coast, Chetco Oregon to California and Chili. 



75 COTULA L. Gen. n. 968. 



Low herbs with alternate lobed or dissected leaves and slender- 

 peduncled heads of yellow flowers. Heads many-flowered, dis- 

 coid, heterogamous. Bracts of the involucre greenish, in about 

 2 ranks. Pistillate flowers in 1-2 rows, apetalous, with deciduous 

 style ; disk-flowers with 4-toothed corollas. Achenes raised on 

 pedicels at maturity, obcompressed, commonly thick-margined 

 or narrowly winged, in our species nearly or quite destitute of 

 pappus. 



C. coronopifolia L. Sp. 892. Somewhat succulent, nearly glabrous: 

 stems ascending, 4-12 inches long: leaves lingulate-linear, laciniate-pin- 

 natifid, or the uppermost entire, with clasping or sheathing base: heads 

 much depressed, 4-6 lines broad: pistillate flowers a single row, on flatten- 

 ed pedicels their achenes bordered with a thick spongy wing, notched at 

 both ends; disk-achenes with wings reduced to a thickened border. Wet 

 grounds near the coast, Oregon and California. Naturalized from Australia, 



C australis Hook. f. Fl. Nov. Zel. 128. Somewhat pubescent : stems 

 slender, diffusely branched : leaves bipinnately dissected into linear lobes : 

 heads small; pistillate flowers in 2-3 rows, their achenes distinctly pedicel- 

 ed ; those of the disk less so. Coast of California and Oregon. Naturalized 

 from Aus'ralia. 



76 TANACETUM Tourn. L. Gen. n. 944. 



Herbs or suflruticose plants with alternate variously dissected 

 leaves and solitary or corymbose heads of yellow flowers. Heads 

 many-flowered, discoid, the flowers all tubular and perfect, w r ith 

 3-5-toothed corolla, or the marginal ones pistillate with more or 

 less oblique or imperfectly ligulate corolla. Bracts of the invo- 

 lucre imbricated, in few or several ranks. Styles deciduous. 

 Achenes 5-ribbed or 3-5-angled, with broad truncate summit, 

 bearing a coroniform pappus or none. 



§ 1 Robust erect perennials, leafy to the top. Leaves 2-3- 

 pinnately dissected into very numerous divisions and lobes often 

 with interposed small ones on the main rhachis. Receptacle flat, 

 quite naked. Pappus coroniform-dentate. 



T. vulgare L. Sp 844. (Tansy) Glabrous or somewhat pubescent: 

 stems 1-3 feet high, usually simy le up to the inflorescence: leaves 4-12 

 inches long, pinnately divided into linear-oblong pinnatifid or incised seg- 

 ments, the lobes acute, usually serrate: heads numerous, crowded in a 



