House: North American Coxvolvulaceae 315 



Yucatan: G. F. Gaumer, 1895 (no. 574); type in the her- 

 barium of the New York Botanical Garden. 



Distributed as/, abutiloides, which it resembles only, but most 

 strikingly, in the texture of the leaves. The inflorescence and 

 flowers possess characters which are very different and serve to 

 distinguish it easily from J. abutiloides. 



Three species of the genus Cressa are now recognized in 

 North America, viz. C. aphylla Heller, C. depressa Goodding, and 

 C. truxillensis H.B.K. ; and to these must be added a fourth : 



Cressa insularis sp. nov. 



Perennial by a lignescent base or woody root ; stems branch- 

 ing mostly above, spreading, the tips ascending, 10-30 cm. long, 

 leafy, densely pubescent with very fine silvery crinkled hairs ; 

 leaf-blades small, sessile, ovate, 2-4 mm. long, broadest below the 

 middle, rounded at the base, apex acute ; flowers subsessile or the 

 pedicels 1-2 mm. long; sepals elliptical-oblong, about 3-5 mm. 

 long, convex, obtuse or rounded, the subtending bracts very 

 small, ovate, 1 — 1.5 mm. long ; lobes of the corolla oblong, spread- 

 ing, obtuse or rounded at the apex, I— 1.5 mm. long, pubescent 

 without ; capsules subconical, obtuse, slightly exceeding the calyx. 



Mexico : Socorro Island : F. E. Barkelew (Expedition to the 

 Revillagigedo Islands; Calif. Acad. Sciences), no. 232; type 

 sheet, no. jppojj in the National Herbarium. 



Clarion Island : A. W. Anthony, 1897 (no. 409). 



Hawaiian Islands : Near Pearl City, Oahu, A. A. Heller, 1895 

 (no. 2410). 



Closely resembling the C. cretica of the old world, which is 

 also in its typical form a small-leaved species but has a much 

 smaller calyx and longer more acute lobes to the corolla, and is 

 pubescent with some spreading hairs in addition to being canescent. 



The genus Evolvulus L. is represented in North America by 

 about twenty-two species, nearly all of them small and inconspic- 

 uous annuals or perennials. A brief study of the available her- 

 barium material shows that the Mexican species in particular are 

 in need of a careful revision. The following new species, are 

 offered as a preliminary contribution to such a work : 



Evolvulus Wilcoxiana sp. nov. 



Perennial ; branching from a woody, deep-seated root ; 

 branches diffuse and spreading, lignescent below, the herbaceous 



