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 cm. high, 3 cm. broad including 

 the rays. — Leptosyne pinnata Rob. Proc. Am. Acad, xxvii. 176 (1892). 

 — Mexico: wet meadows, Del Rio, 30 Aug. 1890, Pringlc 3668 (type 

 in Gray Herb.); wet meadows. Valley of Toluca, 19 Aug. 1892, 

 Pringlc 4194; wet alpine meadows. Sierra de las Cruces, 2990 m., 

 28 Aug. 1904, Pringle 13067. 



1/3. S. PINNATA (Rob.) Blake var. integrifolia (Greenm.) Blake, n. 

 comb. Leaves entire, narrowh^ 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). — 

 DuRANGo: near El Salto, 12 July 1898, Nelson 4.580 (cotype in Gray 

 Herb.). 



II. A REVISION OF ENCELIA AND SOME RELATED 



GENERA. 



In the course of a revision of the genus Encclia, 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 

 Viguicra, Flourensia, and Verhcsina, 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. Hclianthus, 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 (//. 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 and 

 the chartaceo-cartilaginous wings of the flat achene, but these being 

 usually invisible or indistinct in the o^•ary young material is easily 



