346 PROCEEDINGS OF THE AMERICAN ACADEMY. 
1. S. pinnata (Rob.) Blake, n. comb. Smooth except base and 
scapes; leaves 1-3.5 dm. long, with 3-6 pairs of small oblong lobes and 
a much enlarged slightly glandular-crenulate terminal one 3.5—-9.5 cm. 
long; scapes very rarely branched, densely appressed-pubescent above, 
exceeding the leaves; head about 1 em. high, 3 em. broad including 
the rays.— Leptosyne pinnata Rob. Proc. Am. Acad. xxvii. 176 (1892). 
— Mexico: wet meadows, Del Rio, 30 Aug. 1890, Pringle 3668 (TYPE 
in Gray Herb.); wet meadows, Valley of Toluca, 19 Aug. 1892, 
Pringle 4194; wet alpine meadows, Sierra de las Cruces, 2990 m., 
28 Aug. 1904, Pringle 13067. 
18. S. ptnnaTA (Rob.) Blake var. integrifolia (Greenm.) Blake, n. 
comb. Leaves entire, narrowly lanceolate, only very slightly crenu- 
late, 1.5-2 dm. long; pappus slightly more developed.— Leptosyne 
pinnata var. integrifolia Greenm. Proc. Am. Acad. xl. 44 (1904).— 
DuranoGo: near El Salto, 12 July 1898, Nelson 4580 (coryPE in Gray 
Herb.). 
II. A REVISION OF ENCELIA AND SOME RELATED 
GENERA. 
In the course of a revision of the genus Encelia, as at present under- 
stood, it has been found necessary for clearness of definition to remold 
the group by the reference of a number of species to the related genera 
Viguiera, Flourensia, and Verbesina, and by the recognition of several 
genera long treated as synonymous; and in view of the changes in 
generic boundaries involved it seems desirable to consider briefly the 
history of some of these related genera and to contrast their characters. 
Only two genera of this immediate relationship were known to 
Linnaeus. Helianthus, characterized by its thickish achenes with 
promptly deciduous pappus of paleaceous awns and sometimes also 
squamellae (short intermediate scales), is today taken in its original 
interpretation, save that the small and very distinct genus Heliopsis 
was later erected by Persoon on one of the original species (H. laevis). 
The Linnaean genus Verbesina, on the other hand, was very com- 
posite, its ten original species (reducible to nine or eight) representing 
seven modern genera, two only of the species being now included in 
the genus. It is well distinguished by the generally fertile rays an 
the chartaceo-cartilaginous wings of the flat achene, but these being 
usually invisible or indistinct in the ovary young material is easily 
