Postprint version. Published in Brittonia, Volume 26, Issue 1, January 1, 1974, pages 30-36.
NOTE: At the time of publication, the author David J. Keil was not yet affiliated with Cal Poly.
The definitive version is available at https://doi.org/10.2307/2805917.
This paper is the first of a series of investigations on the systematics of Pectis L., the largest genus in the subtribe Pectidinae of the tribe Helenieae. Pectis consists of about one hundred species of annual or perennial, glandular-dotted, yellow-rayed herbs that are widespread in the warmer parts of the New World. In the present report three previously unrecognized taxa from Mexico and the southwestern United States are described as new, and a new combination also is made