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Inheritance Studies in Interspecific Hybrids Between Carthamus flavescens and C. tinctorius¹

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.

Key Words: Safflower • Rosette stage • Leaf margin • Shattering • Achenes • Pappus • Midveins

² Graduate student (Present address: C.S.I.R.O. Division of Tropical Pastures, St. Lucia, Qld., Australia,) and Professor of Agronomy, University of California, Davis.

Received for publication January 5, 1970.

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