464 COMPOSITE. Chaptalia. 



herbs, with naked scapes bearing solitary heads ; the leaves all radical, 

 lomentose beneath. Flowers white or purplish. 



1. C. tomentosa (Vent. 1. c.) : leaves oblong or nearly lanceolate, some- 

 what petioled, retrorsely denticulate ; the lower surface and the slender scape 

 densely tomentose with a white matted wool ; the upper arachnoid when 

 young, at length glabrous ; head nodding when in flower ; exterior rays 

 16-20, simply ligulate.— Pwrs/i/ fl. 2. p. 577 ,• Bol. mag. t. 2257 ; Ell. sk. 

 2. p. 459 ; DC! prodr. 7. p. 41. Perdicium semiflosculare, IValt. ! Car. 

 p. 204. Tussilago integrifolia, Willd. ! spec. 3. p. 1964; Miclix.! fi. 2. 

 p. 121. 



Damp pine barrens, &c. North Carolina! to Florida! and Louisiana I 

 March-May. Scape a span to a foot high. 



Tribe VII. NASSAUVIACE^. Less. 



Heads homogamous, radiatiform ; the flowers all similar and per- 

 fect. Style nearly as in the Senecionese. 



176. ACOURTIA. Don, in trans. Linn. soc. 16. p. 203 ; DC. prodr. p. 65. 



Heads 10-30-flowered, discoid, homogamous ; the flowers perfect. Invo- 

 lucre turbinate ; the scales imbricated in several series, lanceolate, appressed, 

 dilated at the base, articulated with the rachis, deciduous ! Receptacle 

 naked. Corolla of all the flowers bilabiate; the outer lip ligulate and 3- 

 toothed; the inner 2-parted, with the revolute lobes linear and obtuse. An- 

 thers tipped with a linear-lanceolate cartilaginous appendage ; the tails sim- 

 ple and obtuse. Branches of the style truncate, papillose at the apex. 

 Achenia nearly terete, elongated, papillose-scabrous. Pappus a single se- 

 ries of bristles, penicillate at the apex, deciduous. — Shrubby (Mexican and 

 Californian) branching glaucous plants, with the habit of Serratula. Leaves 

 cordate-clasping, with the auricles free, spinulose-serrate. Heads 3-10, fas- 

 ciculate-corymbose : scales of the involucre often reddish, ciliate. Corolla 

 purple or rose-color ; pappus white. DC. 



1. A. microccphala (DC): stem herbaceous? branching; the branches 

 angular, somewhat velvety with a glandular pubescence ; leaves cordate- 

 clasping, ovate, acute, sharply toothed, glandular, somewhat puberulent 

 beneath ; heads several in a thyrsoid corymb ; scales of the involucre 

 mucronate-acuminate, glandular-puberulent on the back. DC. I. c. 



California, Douglas. — This and the Chaptalia are the only North Ameri- 

 can representatives of a suborder, which is eminently characteristic of the 

 westeru portion of South America. 



Suborder III. LIGULIFLOR^. DC. 



Flowers all ligulate and perfect, disposed in a homogamous radiati- 

 form head. Pollen scabrous and many-sided, usually dodecahedral. 



