. The classification of flowering plants. Plants. ERICACEAE 429 The leaf-anatomy affords characters which are found to be of value in distinguishing genera and sometimes even tribes. They are founded on the arrangement of the chloro- phyll parenchyma, the presence of water-storing tissue, the arrangement of the stomata on the lower face, and the structure of the Fig. 208. A. Vaccinium Myrtillus, flower cut vertically. B. V. Vitis-idaea, diagram of a pentamerous flower. C. Arctostaphylos Uva-ursi, flower in vertical section (upper part of corolla not shewn). D, E. Side and front views o
. The classification of flowering plants. Plants. ERICACEAE 429 The leaf-anatomy affords characters which are found to be of value in distinguishing genera and sometimes even tribes. They are founded on the arrangement of the chloro- phyll parenchyma, the presence of water-storing tissue, the arrangement of the stomata on the lower face, and the structure of the Fig. 208. A. Vaccinium Myrtillus, flower cut vertically. B. V. Vitis-idaea, diagram of a pentamerous flower. C. Arctostaphylos Uva-ursi, flower in vertical section (upper part of corolla not shewn). D, E. Side and front views of stamen of Arbutus Unedo. F. Stamen of Vaccinium Vitis-idaea. G. Stamens and pistil of Erica caffra. All enlarged. (A after Engler; B after Eichler; C after Warming; D-G after Drude.) The flowers are sometimes soUtary and axillary or terminal, but are generally arranged in few- to many-flowered racemose inflorescences at the end of the branches, as in Rhododendron (an umbel). Arbutus (a panicle), or on small lateral shoots [Erica): a bract and pair of bracteoles are normally present. They are regular, or in Eliododendron (fig. 209) slightly zygo- morphic with stamens of unequal length and bent downwards towards the mouth of the flower (declinate), and conform with few exceptions to the formula Sn, Pn, An — n, G(n), with four or five members in each whorl; the androecium is obdiplo-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rendle, A. B. (Alfred Barton), 1865-1938. Cambridge, University press
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
