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SOLIVA : COMPOSIT , 363 
COTU LA | 
equal bractsin 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. ¢. Villous or the leaves g!abrate: 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 Kaeadly obovate, thin-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 CJTULA 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. coronopiroLia L. Sp. 892. Somewhat succulent, nearly glabrous: 
stems ascending, 4-12.inches long: leaves lingulate-linear, Jaciniate-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 avhenes 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 suffruticose plants with alternate variously dissected 
leaves and solitary or corymbose heads of yellow flowers. Heads 
many-flowered, discoid, the flowers all tubular and perfect, with 
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. Leayes 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. vurcare L, Sp 844. (Tansy) Glabrous or somewhat pubescent: 
stems 1-3 feet high, usually simyle 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 
