科研之友
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摘要
Recent studies of Solanum L. (Solanaceae) phylogeny using both plastid and nuclear DNA sequences have shown that a distinct clade comprising the members of Solanum sect. Geminata (G. Don) Walp. (woody, non-spiny solanums with simple or branched trichomes and usually leaf-opposed infloresceners) also inclues a small Caribbean group of species known as section Diamonon (raf.) A. Child, whose relationships have previously been obsecure S. acropterum Grisch., S. conocarpum Dunal. S. havanense Jacq., and S. troyanum Urb. Work on a monograph of section Holophylla (C. Don) Walp, (s.l.) has also revealed that several species previously excluded from section Geminata on morphologial grounds belong to the more broadly circumscribed group recognized as the Germinata clade. In addition , since the publication of the monograph of Solanum sect, Geminata, seven new species of these rare forest understory shrubs have been described (S, chalmersii S. Knapp, S.humboldtianum Granados-Tochoy & S. Knapp, S. monanthemon S. Knapp. S. naucinum S. Knapp, S. pseudodaphnopsis L. A Mentz & Stechmann, S. sagittantherum Granados-Tochoy & C.I. Orozeo, and S. sumaraspi S. Knapp). An additional new species from Ecuador, , S. elvasioides S. Knapp, is described here. I review the status and circumscription of section Geminata in the New World and its relation to the Geminata clade, and provide descriptions for all the species of the Caribbean S. havanense species group and all species previously excluded from section Geminata. Lectotypes are selected for S. aeropterum, S. Hookerianum A. Spreng., S myrtifolium Lodd., S. havanense Vell., S. troyanum, S. argentium Bitter & Lillo and S. eronymoides Sendin., and a neotype is selected for S. havanense.
- 出版日期2008
