350  COMPOSIT A (ahem sk anki 
LAGOR HYLLA 
backs: rays white, fan-shaped 3-lobed, their achenes glabrous or glabrate 
short: J appus of the disk-flowers shorter than the achenes, of 10-12 unequ, 
al palez, 5 of them oblong to lanceolate. On dry plains, southern Oregon- 
to California. a 
3 54 CENTROMADIA Greene Man. 196. 
Rigid branching annuals with some of the lower leaves pin- 
natifid and the uppermost clustered around the sessile heads. 
Upper leaves or their lobes pungently pointed. Heads many- 
flowered; ray-flowers pistillate, numerous and in more than one 
series ; disk-flowers perfect but mostly sterile. Bracts of the in- 
volucre rounded on the back, concave and partly enclosing. the 
ray-achenes, acuminate and pungently pointed. Receptacle coni- 
cal or convex, chaffy, all the disk-flowers being subtended by 
narrow and: mostly quite distinct chaffy scales. Ray-achenes 
turgid, obovate-triangular, very oblique, the terminal areola from 
the summit of the inner angle or face, and by gibbosity common- 
ly intraapical, raised on a little apiculation’ * 
C. Fitchii Greene 1.c. Villous hirsute, somewhat viscid, above bese} 
with small scattered tack-shaped glands: stems stoutish, 6-20 inches high, — 
branching: leaves linear or subulate, 2-3 inches long, acute and pungently 
pointed, some of the lower ones once or twice pinnately parted: heads 
numerous, terminating the branches: bracts ofthe involucre subulate: 
rays yellow, narrow, their achenes obovate-triquetrous: chaff of the convex 
receptacle soft and pointless, villous: disk-achenes sterile, with a pappus 
of 8-12 linear palee fringed or bearded at tip, somewhat united at base. 
Dry plains, southern Oregon to California. 
55 LAGOPHYLLA Nutt, Trans. Am. Phil. Soc. yii, 390 
Slender much branched annuals with narrow leaves and mid- 
dle-sized heads with yellow, white or pink ray-flowers. Heads 
jew-flowered; rays about 5, pistillate ; disk-flowers 5 or 6, perfect 
but sterile. Bracts of the involucre as many as ray-flowers, her- 
baceous the margins infolded and enclosing their achenes. Re- 
ceptacle flat, fimbrillate-hirsute in the centre, chaffy at the mar- 
gin between the ray- and disk-flowers, the chaffy scales 5-6, in a 
single series, distinct. Achenessmooth, without pappus: of the 
rays oblong-cuneiform, obcompressed, straight, nearly flat and 
obscurely angled on the back. 
L. ramosissima Nutt. |.c. Stem slender, paniculately much branched, 
6-30 inches high: leaves entire, canescent with soft silky pubescence; tad- 
ical and lowest cauline obovate-spatulate; upper lanceolate or linear,ob- 
tuse: the short ones subtending the crowded heads linear-oblong, densel 
- ciliate with very soft villous hairs: heads 3 lines high, crowded in small 
and at length rather scattered irregular clusters: bracts of the involucre 
3-4 lines long, comose-ciliate : rays yellow, closing in sunshine: achenes ob- 
ovate-oblong, carinate down the inner face. Common on dry plains and 
hill-sides, Brit. Columbia to California and Idaho, : 
56 LAYIA H.&A. Bot. Beech. 148. | 
Low annual or biennial herbs with mostly opposite leaves and 
middle-sized heads of yellow or white flowers, Heads many- 
flowered : the ray-flowers 10-15, pistillate: those of the disk tubu- 
