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Mentha canadensis L. (Lamiaceae): a relict amphidiploid from the Lower Tertiary

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Two clones of Mentha arvensis L., both with 2n = 72 from Europe, one with 49.20 ± 2.28% pulegone, another with 57.31 ± 9.41% linalool, were hybridized with M. longifolia (L.) L. from Europe with 2n = 24 and 51.87 ± 0.50% trans-piperitone oxide. The F1 hybrids had essential oils rich in pulegone, isomenthone, menthone, trans-isopulegone, menthol, neomenthol, 3-octanol, linalool, cis-piperitone oxide, trans-piperitone oxide, carvone, limonene, piperitenone oxide, trans-carveol, trans-sabinene hydrate, 3-octanone, terpinen-4-ol, (Z)--ocimene, geranyl acetate, citronellyl acetate, and/or -caryophyllene. Thirty-nine F1 hybrids of this cross are similar to 23 clones of M. canadensis L. from North America and Asia with 2n = 96 when compared by chromosome numbers, morphology, and essential oils. Mentha canadensis is proposed as a relict amphidiploid of the mixed mesophytic flora of the Lower Tertiary.


Document Type: Miscellaneous

Affiliations: 1: Department of Agriculture & Natural Resources, Delaware State University, Dover, Delaware 19901, U.S.A. 2: 4761 SW Hollyhock Cir., Corvallis, Oregon 97333, U.S.A.

Publication date: November 1, 2002

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