C M P O S I T JE. 357 



Suborder 1. EuPATORiAOEiE. 



Heads ray less. Corollas all tubular and regular, never yellow, though 

 sometimes cream-color. Anthers without tails. Style-branches elon- 

 gated, usually clavate, minutely papillose or puberulent, the stigmatic 

 lines only near the base. 



Hints of the Genera. 



Achenes l-angled ; pappus partly squamellate, ---____i 



Achenes .5-angled; pappus bristly, ---------- 2 



Achenes 10-striate, ---------____3 



1. TRICHOCORONIS, Gray. Weak and flaccid fibrous-rooted 

 perennial of muddy shores. Leaves opposite or attenuate, sessile. 

 Heads few, peduncled, terminating somewhat corymbose branches. 

 Flowers flesh-color. Style-branches scarcely clavate ; rather linear and 

 flattish. Papjnis of small awns and intervening paleae. 



1. T. riparsa, Greene, Eryth. i. 42 (1893); Pitt. ii. 216 (1891), under 

 Biohtlia. Stems assurgeut, hardly a foot high, sparsely pubescent : 

 leaves linear-lanceolate, remotely serrate, slightly auricled at base: 

 heads 2^2 lines broad : achenes ^4 line long, sharply 4-angled, the sides 

 dark brown, the angles hispid-ciliolate toward the summit ; pappus of 4 

 barbellate bristles and as many intervening minute fimbriate-lacerate 

 scales. — Banks of the lower San Joaquin. 



2.- EUPATORIIJM, Toumeforl. Our species a suffrutescent herb, with 

 leaves mostly alternate. Achenes 5-angled, with no intervening ribs or 

 striae. Pappus of many rather rigid scabrous bristles. 



' 1. E. occideutale, Hook. Fl. i. 305 (1833). Nearly glabrous, slightly 

 glandular, 1—2 ft. high, the somewhat tufted stems erect and simple 

 from a woody base : leaves ovate, truncate or subcordate at base, spar- 

 ingly dentate, 1—2 in. long, in very short petioles: cymes somewhat 

 pauicled at and near the summit of the stem: involucral bracts about 

 15, in 2 series, lanceolate, nearly nerveless: corollas pinkish.— Crevices 

 of rocks in the higher Sierra, and more plentiful eastward in Nevada. 

 Aug. -Oct. 



3. COLEOSANTHUS, Cassmi. Perennial, often suffrutescent. In- 

 florescence of terminal and subterminal short clusters of narrow heads. 

 Involucre of striate- nerved scales, the outer shorter. Corollas slender, 

 5-toothed. Style bulbous at base. Achenes 10-striate or -ribbed. Pap- 

 pus of numerous but uuiserial scabrous or barbellate bristles. 



