Abstract
Gillett, Georce W. (Michigan State U., East Lansing.) An experimental study of variation in the Phacelia sericea complex. Amer. Jour. Bot. 48(1): 1–7. Illus. 1961.—The Phacelia sericea complex consists of 2 diploid (n = 11), intergrading species, P. idahoensis and P. sericea. The experimental culture of several races of this complex demonstrated that differences in pubescence, leaf shape, and flower shape persist in plants grown in a common environment. Experimental interspecific F1 hybrids demonstrated high fertility; portrayed intermediate expressions of pubescence, leaf shape, and flower shape; and were found to be, in many cases, indistinguishable from many wild intermediates. A study of herbarium specimens revealed numerous intergrades in which pubescence, leaf shape, and flower shape are highly variable, though loosely correlated. The evidence obtained from herbarium specimens, greenhouse cultures, field investigations, chromosome studies, and experimental hybridizations suggests a hybrid origin for the wild intermediates, recognized as Phacelia sericea (Graham) A. Gray subsp. ciliosa (Rydb.) Gillett.
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