XI. Observations on the natural Group of Plants called Pomaceae
1821; Oxford University Press; Volume: 13; Issue: 1 Linguagem: Inglês
10.1111/j.1095-8339.1821.tb00058.x
ISSN1945-9335
Autores Tópico(s)Plant Taxonomy and Phylogenetics
ResumoTHE natural group of plants comprehended in the first section of Jussieu's Rosacea has, on account of its near affinity to Rosa, lately occupied much of my attention ; and as an apparent uniformity in the structure of its genera has been the catwe of much dispute respecting their limits, an attempt to ascertain these with something like precision may not perhaps be unacceptable to the Society.Linnaeus admitted but four genera, Cratcegus, Sor6us, Hespi-Zus, and Pyrus ; from which Jussieu distinguishes Ilfnlus and Cydonia.Medicus, in his Lc Geschichte der Botanik unserer zeiten," published in 1793, out of these formed eleven, in which he has been partially followed by Borkhausen and Monch.His genera are unfortunately by no means natural ; and the characters upon which they are founded have been considered unimportant by most botanists, who have therefore adopted the genera of either Jussieu or Linnaeus.Sir James Smith, aware of the uncertainty in number of styles by which those of the latter have been principally distinguished, has in Flora Brifanizicn and Reeds Cydoyccdia (article Jfespilus) reduced all the genera to two ; characterizing Pyrus, to which he refers Cydonia and Sorbus, by the thin texture of its endocarp, and MespiZus, including Cratcegus, by the O S S ~O U S substance of the same part, or, as he, following Linnaus, expresses it, by its berry.But
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