450 DESCRIPTIONS OF NEW SPECIES 



series; sepals linear, membranaceous on the margin. Receptacle naked. 

 Anthers not bisetose. Achenium compressed, linear, acute at base, villous. 

 Pappus of the radial masculine florets double, the outer paleaceous, entire, 

 acute and elongated, the inner of a single series of scabrous hairs; pappus of 

 } the discal florets simple, pilose and scabrous, in several series. — Apparently 

 a small acerose leaved, evergreen shrub of Peru, resembling a Heath. 

 Leaves linear, obtuse, narrow and short, adnately revolute to the centre. 

 Flowers yellow? aggregated at the summit of the branches, sessile, and sur- 

 rounded by the imbricated leaves. — (The name is derived from rrapacTTpe^w, 

 to invert; in allusion to the singular inversion of the florets, the masculine 

 being external! in place of the usual order of internal.) 



Parastrephia ^ericoides. 



Hab. In Peru, near Arequipa; (Mr. Curson.) In sandy soil. Leaves and stem quite similar 

 to those of Ceratiola ericoides.; the branches terete and tomentose; the leaves approximate, acerose, 

 short and spreading, in about four rows, smooth and glutinous, bitter to the taste, about two 

 lines long, and half a line wide, on the young shoots inbricated as in Abies. Involucrum sessile, 

 the scales scariose on the margins, linear-oblong, nearly smooth. Pappus copious, as long as the 

 florets, unequal and scabrous, rather rigid: the outer paleaceous pappus of the male flowers nearly 

 half the length of the inner pilose hairs, subulate, white and shining, much longer than in any 

 Chrysopsis. Achenium somewhat villous and compressed, linear-fusiform, almost exactly like 

 that of Aster. In fact, our plant, notwithstanding its present arrangement, is nearly allied to 

 Chrysocoma or Lynosyris, of which it has entirely the habit. The fen^ale florets are ve^-y slender 

 and without any vestige of stamens ; the style is also abortive in the male flowers of the ray. The 

 florets of each kind are nearly equal in number; the female probably somewhat more numerous. 

 (My specimens are mere sprigs, and I arn, therefore unacquainted with, the habit of this curious 

 plant.) 



Tribe SENECIONWE J^.-^DiYision Heliopside^. 



*MICR0CH7ETA. (Lipoch^ta and Wollastonia, Deccmd. in part.) 



Capitulum many-flowered, radiate; rays in one series, feminine. Discal florets 

 hermaphrodite, five-toothed. Involucrum hemispherical or subcampanulate„ 

 the sepals foliaceous in two nearly equal series. Receptacle convex, palea- 

 ceous, the palese membranaceous and folded. Branches of the discal styles, 

 acutely acuminate, as well as those of the ray. Fertile achenia triquetrous, 

 or obtusely quadrangular, i];idurated, subalated and scabrous;, infertile or 



