. The classification of flowering plants. Plants. RUBIACEAE 555 The aestivation of the corolla supplies characters for dis- tinction of tribes; most general are the valvate and contorted. Zygomorphy occurs in some genera, the flower tending to become bilabiate, as in Henriquezia (Amazon province). The stamens are generally inserted at or near the throat of the corolla, more rarely at its base when they are sometimes united below, or throughout their length; the anthers usually dehisce by longitudinal slits, though sometimes by apical. Fig. 256. Coffea arabica. A. Portion of plant about half na
. The classification of flowering plants. Plants. RUBIACEAE 555 The aestivation of the corolla supplies characters for dis- tinction of tribes; most general are the valvate and contorted. Zygomorphy occurs in some genera, the flower tending to become bilabiate, as in Henriquezia (Amazon province). The stamens are generally inserted at or near the throat of the corolla, more rarely at its base when they are sometimes united below, or throughout their length; the anthers usually dehisce by longitudinal slits, though sometimes by apical. Fig. 256. Coffea arabica. A. Portion of plant about half nat. size. B. Flower in vertical section, x 2^. C. Fruit. D. Seed. E. Seed after removal of parchment-like testa. F. Homy endosperm cut across. G. Seed cut open to shew embryo lying towards the base of the endosperm; the radicle is inferior. C—G x 2. (A, B after Bentley and Trimen.) pores, as, for instance, when the filaments are united. Hetero- styled flowers with stamens of different length occur (Olden- landia and others). In zygomorphic corollas the stamens may be of unequal length and bent. Exceptions to the completely inferior ovary occur in certain genera, as the Austrahan Synaptantha, where it is half-inferior, and in Gaertnera (tropical Africa and India) and Pagamea (Brazil, Guiana), where it is superior. In most cases the. 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
Size: 1787px × 1398px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
