Last Addition: June 29, 1999
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Calycadenia villosa is a rare white-flowered (fading pink) species occupying some of the harshest habitats found in the South Coast Range. Two rather distinctive forms are known. One, "villosa," is erect and sparingly branched and has showy heads with rays very unequally lobed. The other, "depressa," is more profusely branched, lacks a dominant central axis, and has smaller heads with the ray corollas more evenly lobed than those of "villosa." These distinctions may blur as additional populations are studied. The chromosome number is n = 7. Natural interspecific hybridization is unknown. Artificial interspecific hybrids between C. villosa and C. hooveri, C. mollis, C. truncata, and Osmadenia tenella have been produced.