AND GENERA OF PLANTS. 299 



florets fifteen to twenty. Pappus exserted beyond the involucrum, as long as the florets, of two 

 kinds, one bristly, the other clavellate, or wider towards the extremity. Receptacle alveolate, 

 alveolae with elevated, lacerated margins, much more distinctly so than in any Sericocarpus. 



1 1 Achenia smooth, flowers white. 



Bucephalus albus, leaves lanceolate linear, scabrous on the margin, remote, en- 

 tire, radical ones denticulate, lanceolate; corymb few-flowered; rays fourteen 

 to fifteen, white. — Chrysopsis alba, Nutt. Gen. Am., Vol. II., p. 152. Hek- 

 astrum album, Decand., Vol. V., p. 264. Certainly not a congener with H. 

 paludosum, which (notwithstanding the variation of pappus) is a true Aster. 

 Involucrum of three series of greenish carinated scales. 



t t t *Lagatea. — Inner scales of the involucrum longer; pappus scarcely 



clavellate. 



Bucephalus glaucus; smooth and glaucous ; leaves linear-oblong, acute, sub- 

 amplexicaule, entire; stem branching above; flowers racemose, corymbose; 

 scales of the involucrum oblong-ovate, obtuse. 



Hab. Towards the sources of the Platte, and in the Rocky Mountains. Rays purplish, nar- 

 row, about fourteen. Pappus slender, nearly or wholly equal; tubular florets, about fifteen to 

 twenty. Flowers fastigiate, but sometimes racemose on the branchlets. Stem twelve to eighteen 

 inches high. Leaves two to three inches long, smooth and somewhat coriaceous, reticulately 

 veined, a little scabrous on the margin, less than half an inch wide. Scales of the involucrum 

 about three series, the innermost longer, thin and acute. 



Bucephalus *ericoides; a small alpine, csespitose plant, canescently hirsute and 

 glandular, with appressed short hairs; leaves subulate, minute, channelled, ci- 

 liate and acute, almost imbricate ly approximate, erect; branching from the 

 base, branches one-flowered; rays white, about fifteen; achenia smooth. 



Hab. Towards the summit of the Rocky Mountains. Collected by Dr. James. Inula? eri- 

 coides, ToRREY, Lyceum Nat. Hist., N. York, 1. c. Chrysopsis ericoides, Eaton's Manual, 1. c. 

 About four or five inches high, with leaves about the size of those of Jiiniperus virginiana, and 

 nearly as much imbricated as the younger leaves of that tree, about a line long and half a line wide, 

 white, Avith appressed hairs, nearly smooth on the upper side and pointed with a bristle, the lower 

 ones strongly ciliate. Involucrum ovate, campanulate, imbricated in two unequal series of appressed, 

 lanceolate, acute scales, membranous on the margin. Rays apparently white, or purplish, with 

 exserted, filiform, smooth stigmas. Stigma in the discal florets pubescent. Pappus of rather few, 

 scarcely scabrous, slender white rays. No double pappus. 



