378 DESCRIPTIONS OF NEW SPECIES 



flowers corymbose; sepals oblong or lanceolate, longer than the disk; ache- 

 nium linear, elongated, pilose, more than twice as long as the pappus. — Bahia 

 Ambrosioides; (Lagasca.) 



Hab. Chili. (Dr. Styles.) A small under shrub, more or less gray and puberulous; leaves 

 opposite, trifid, or twice trifid, the segments oblong and incise ; flowers corymbose, with the rays 

 longer than the disk. The discal florets and involucrum almost that of Hymenopappus, to which 

 it is intimately related. Flowers by threes, six to nine in a corymb. 



Stylesia ^puherula; minutely pubescent; leaves ternately bipinnatifid, petio- 

 late, segments oblong or cuneate-oblong, somewhat obtuse; flowers corymbose; 

 sepals ovate, glandularly pubescent; achenium obconic, scarcely longer than 

 the pappus. 



Hab. Chili. (Dr. Styles.) Nearly allied to the preceding. A shrub, with rather stout branches, 

 the stems very full of leaves in the axills. Flowers corymbose, probably white? Rays five or 

 six. The involucrum nearly hemispherical. Pappus brown, shorter than in the preceding ; the 

 achenium, also, not more than half the length of that species. Leaves in three principal divisions, 

 the lowest segment pinnatifid, the upper and terminal merely bifid or trifid. 



ACTINELLA. (Persoon.) 



Capitulum heterogamous, many-flowered; rays feminine, ouneate, three-toothed. 

 Involucrum hemispherical or subcampanulate, biserial, shorter than the flo- 

 rets; sepals nearly equal. Receptacle naked, convex or conic; discal florets 

 short and tubular, five-toothed, villous at the summit; anthers included. 

 Stigmas revolute, obtuse, externally hispid, inappendiculate, in the ray fili- 

 form and smooth. Achenium turbinate, subcylindric, striate, densely pilose. 

 Pappus of about five to twelve membranaceous, aristate palese, eroded on 

 their margins. — Herbaceous or suffruticose plants of North and South Ame- 

 rica. Stemless or branching; leaves entire, incise, or pinnatifid; flowers pe- 

 dicellate, solitary, mostly yellow. 



t Stem herbaceous, leafless, scapoid; the leaves radical, and mostly entire. 



Actinella acaulis; Ndtt. Gen. Am., Vol. II., p. 173. Galardia acaulis; 

 PuRSH, Vol. II., p. 743. Cephalophora acaulis; Decand., Vol V., p. 663. 

 Leaves softly and sericeously villous, canescent, in csespitose tufts. Root long, 

 thick and fusiform; scapes sometimes, though very rarely, with a single leaf. 

 Rays ten to twelve. Receptacle convex. 



Hab. Hills towards the sources of the Platte, in chalky soil. 



