AND GENERA OF PLANTS. 377 
Hymenopappus Douglasii, Hoox., Vol. I., P. 316. Nutt. in Journ. Acad. Nat. 
Sci. Philad., Vol. VIL, p. 30. 
Has. In the Rocky Mountains, towards the sources of the Missouri and the Platte. Allied to 
the preceding, but a much smoother and more slender plant, and with a different pappus and ache- 
nium. ‘he florets, like those of the preceding, are pale rose-coloured. Radial florets with a 
shorter pappus, and a scabrous, slightly hairy achenium; the central fruit villous. 
PotypTeris. Oss. Involucrum biserial, equal, subcampanulate. Sepals 
greenish-white, oval, obtuse, with broad, membranaceous margins, (as in Hy- 
menopappus;) tube of the floret filiform, as long, or longer than the campanu- 
late, deeply five-cleft border, the segments of which are smooth, linear and - 
revolute, (and appear to have been white, or ochroleucous.) Stigmas filiform, 
equal, hirsute, much exserted. Achenium angular, acute below, black, slightly 
scabrous; pappus of ten to twelve lanceolate, brownish, membranaceous leaves, 
with a strong mid-rib carried out to a terminal, shortly awned point, the rib 
externally hirsute. Flowers disposed in corymbose, pedunculated clusters. 
*STYLESIA. 
Capitulum heterogamous, many-flowered; rays in a single series, (six to eight,) 
oblong, entire, feminine; discal florets hermaphrodite, the border five-cleft, 
campanulate, the tube glandularly pilose. Stigmas obtuse, pubescent, re- 
volute, short, terminated with a minute cone. Involucrum turbinate-cam- 
panulate; sepals eight, in a single series, ovate, obtuse, membranaceous 
on the margin, distinct at the base. Receptacle small, naked. Achenium 
linear-turbinate, narrowed below; when mature, flatly four-sided. Pap- 
pus a small chaff} 
less scales.—Suffruticose plants of Chili, with opposite, multifid leaves, and 
fy crown, of about eight obtuse, somewhat lacerated, nerve- 
corymbose, pedunculated flowers, with the rays white and the disk yellow. 
Allied apparently to Hymenozys, but with a very different habit to Bahia.— 
(Named in honour of Doctor Styles, who made a very interesting collection 
of Chilian plants, now mostly in the Herbarium of the Academy of Natural 
Sciences in Philadelphia.) 
Stylesia Ambrosioides; upper part of the stem and involucrum villous and 
glandular; leaves ternately bipinnatifid, petiolate, segments oblong, obtuse; 
viI.—4 U 
