138 PROCEEDINGS OP THE AMERICAN ACADEMY 



angles ; pappus in a single series, slightly scabrous. — In the Sierra 

 Madre near Monterey; June, 1888 (n. 2201). 



EuPATORiUM (?) Chapalense. Woofly, the branches terete, gla- 

 brous : leaves opposite, ovate-lanceolate, acute, rounded at base but 

 decurrent upon the slender petiole, 3-5-nerved above the base, serrate, 

 puberulent above on the veins and villous-tomentose on the nerves 

 beneath, 1|- to 2^ inches long, the petioles about an inch long: heads 

 on slender bracteate puberulent peduncles in a dense terminal corymb, 

 20-flowered or more, narrovp at base ; involucral scales mostly nearly 

 equal, 4 lines long, thin, linear, acute, pubescent; receptacle depressed- 

 conical, smooth and naked : achenes (immature) apparently obtusely 

 pentagonal, papillose; pappus-bristles in more than one row, distinctly 

 barbellate, unequal, the outer very short. — In the mountains near 

 Lake Chapala ; December, 1889 (n. 2974). Near E. multisei-ratum, 

 Schultz Bip., in habit and involucre, but the pluriseriate unequal pap- 

 l)us is abnormal. The unequal pappus suggests Piptolhrix, but the 

 setce are much more numerous and not caducous, while the heads, 

 flowers, and pappus are twice longer than in either of the species of 

 that genus. 



OLIGONEMA, a new genus of the homochromous Asteroidece. 

 Heads many-flowered, radiate and heterogamous, the ray- and disk-flow- 

 ers all fertile. Involucre broadly campanulate, of many nearly equal 

 herbaceous scales in several series, the inner series becoming some- 

 what coriaceous with herbaceous tips. Receptacle nearly flat, naked. 

 Ligules linear, yellow, slightly 3-toothed; disk-corollastubidar,tlie throat 

 scarcely dilated and about equalling the oblong acute lobes. Anthers 

 obtuse at base. Style-branches tipped with attenuate conical appen- 

 dages. Achenes of the ray compressed-triangular, those of the disk 

 obcompressed, elliptical, glabrous, rather thin-margined, truncate, the 

 thickened margin of the summit bearing 1 to 4 very delicate lax 

 scabrellate deciduous hairs. — A stout annual aquatic or marsh herb, 

 with alternate linear entire leaves, the submerged pinnately parted ; 

 iieads rather large, terminal on the branches. A genus most nearly 

 related to Grindelia^ strongly marked by its habit and the characters 

 of the achenes and pappus. 



O. HETEuorriYLLA. Mostly glabrous, somewhat glandular-pubes- 

 cent above, the stem 2 or 3 feet high, fistulous, sending out delicate 

 rootlets from the submerged nodes : leaves sessile, clasping, acumi- 

 nate, 2 or 3 inches long, the submerged pinnate with narrowly linear 

 entire or toothed segments : heads half an inch broad, the orange lig- 

 ules G to 8 lines long ; involucral scales lanceolate, acuminate : achenes 



