Carthamus flavescens Spreng is an annual herbaceous weed, indigenous to the Middle East, and closely related to C. tinctorius L. (cultivated safflower). Inheritance of the following characters was found to be determined by a single gene each in interspecific crosses between these species: short vs. long rosette stage of growth, lobed vs. entire leaf margins, shattering vs. nonshattering of the achenes, white vs. pigmented achenes, presence vs. absence of pappus, and purple vs. green midveins of the cotyledonary leaves. The role of C. flavescens in the evolution of cultivated safflower is discussed.
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Imrie et al. (1970) studied this question.
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