AND GENEKA OF PLANTS. 377 



Hymenopappus Douglasii, Hook., Vol. I., p. 316. Nutt. in Journ. Acad. Nat. 

 Sci. Philad., Vol. VIL, p. 30. 



Hab. 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. The florets, like those of the preceding, are pale rose-coloured. Radial florets with a 

 shorter pappus, and a scabrous, slightly hairy acheniura ; the central fruit villous. 



PoLYPTERis. Obs. 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 chaffy crown, of about eight obtuse, somewhat lacerated, nerve- 

 less scales. — ^Suffruticose plants of Chili, with opposite, multifid leaves, and 

 corymbose, pedunculated flowers, with the rays white and the disk yellow. 

 Allied apparently to Hymenoxys, 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 



