Contributions from the Henry Shaw School of Botany Volume 25

Contributions from the Henry Shaw School of Botany Volume 25

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...anatomical characters, especially in the endosperm of Parietales. According to Pritzel the arrangement of the Parietales is an unnatural one. The Chlaenaceae are excluded. Pritzel finds that their anatomical characters show them to be allies of the Malvaceae and not Tlzeaceae, where the order was placed by Engler and Prantl in their Naturlichen Pflanzenfamilien. If differential points of this kind occur in related species, what of hybrids? It has been shown that hybrids show intermediate characters. Wettstein (469) has found excellent characters in the hybrids of some conifers, Pinus and Juniperus. He determined that J. Kanilzii had its origin in J. sabinoides X J. communis. The anatomical structure confirmed his previous opinion.T Intermediate anatomical characters also occur in P3/rus Malus X P. toringo. If these characters occur and repeat themselves in the hybrid offspring it would certainly seem probable that anatomy should often show some most tangible characters. This investigation as applied to seeds reveals many excellent characters, shown to better advantage by Harz (99, 2: 5551350) than by any other writer. Godfrin (71) was most conservative in expressing the opinion that anatomical seed characters could not be or are of but little value for systematic purposes. I expressed a conservative view in a paper on the structure of the testa in Euphorbiaceae (416), to which Gram (339. 340) takes exception. I recognized differences, and called attention to the mucilaginous spiricles, somewhat similar to those in Ruellia, in some sections of the genus Euphorbia, and the total absence of mucilage in some species. In some recent studies of the testa of Berberidaceae, I have found some excellent generic characters; but very closely more

Product details

  • Paperback | 226 pages
  • 189 x 246 x 12mm | 413g
  • United States
  • English
  • black & white illustrations
  • 1236855558
  • 9781236855558