Two new species of Convolvulus from the western United States* 



Homer Doliver House 



The two species of Convohmhts described below are based 

 upon plants from the collection made by C. S, Crandall in Colo- 

 rado in 1896. Convolviihis awensis L. is an European species 

 widely introduced into America. There is found, however, an indig- 

 enous ally to it in the western states which appears to be distinct. 



Convolvulus ambigens sp. nov. 



Prostrate or trailing, annual, or perennial only at the base, 

 branching, two to several dm. in length ; finely cinereous-pubes- 

 cent, rather densely so toward the tip, often glabrate below on the 

 stem: leaf-blades ovate-oblong or triangular-oblong, 1.5-4 cm. 

 long, abruptly acute, truncate or nearly so at the base, entire ex- 

 cept for the acute, laterally-spreading basal auricles which are 

 often sub-toothed below; petioles shorter than the blades: flow- 

 ers axillary, solitary, often on erect leafy branches ; peduncles 

 1.5-3 ^"^- l<^^'^g ; pedicels slightly thickened: sepals oblong or 

 suborbicular, about 3 mm. long, rounded at the apex : corolla 

 rotate-funnelform, 1.5-2 cm. long, the subentire limb as broad, 

 white or with pink stripes : stigmas linear. 



In loose soil, among bushes and in fields, chiefly in river-val- 

 leys, Montana to New Mexico, Oregon and southern California. 

 The type collected near Fort Collins, Colorado, by C. S, Cran- 

 dall, no. 4.218, June 22, 1896, in the herbarium of the New York 

 Botanical Garden. Duplicate type of the same collection In the 

 National Herbarium, sheet no. 48612 1. In addition to the type 

 collection the following specimens may be referred here : 



Along railroad near Fort Collins, C. S. Crandall, August 23, 

 1898. C. S. Sheldon 11, July 8, 1884. Reno, Nevada, J/. E. 



/. 



Jones, June ii, 1897. Hot Springs, Arizona 

 June 17, 1892. 



Californian specimens differ from the type chiefly in their more 

 pronounced pubescence, and must be referred here until they are 

 better known. 



permission 



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