. The botany of crop plants : a text and reference book. Botany, Economic. GRAMINEyE (POACE^), GRASS FAMILY 83. The grass fruit is called a grain or caryopsis. There is an abundance of starchy endosperm. Sometimes the grain is closely adherent to the palet and lemma, as in most barleys and oats. Phylogeny of Grasses.—The history of the evolution of a group of organ- isms is phylogeny. What is the origin of the grasses? Are they primitive forms, the progenitors of such closely related groups as the lihes and other common monocotyledonous plants; or are they a reduced group? By those who hold th
. The botany of crop plants : a text and reference book. Botany, Economic. GRAMINEyE (POACE^), GRASS FAMILY 83. The grass fruit is called a grain or caryopsis. There is an abundance of starchy endosperm. Sometimes the grain is closely adherent to the palet and lemma, as in most barleys and oats. Phylogeny of Grasses.—The history of the evolution of a group of organ- isms is phylogeny. What is the origin of the grasses? Are they primitive forms, the progenitors of such closely related groups as the lihes and other common monocotyledonous plants; or are they a reduced group? By those who hold the latter view, which is more widely accepted, grasses are con- sidered to have come from lily-like plants by a reduction and modification of a number of parts of the flower. Examination of the floral diagram of a typical lily flower is shown in Fig. 31. It has two sets of floral segments (which together constitute the perianth) which alternate, two whorls of stamens, three in each whorl, and a pistil divided into three chambers, hence tri-carpellary. The stamens of one whorl alternate with those in the other; those of the outer whorl alternate with the inner segments 'of the perianth. The three carpels alternate with the inner stamens. In Fig. 31 is shown the floral diagram of a grass flower with the rudimentary or missing parts shaded. According to the view that grasses are reduced lilies, there was a reduction in the lobes of. 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 Robbins, Wilfred William, 1884-1952. Philadelphia : P. Blakiston's Son
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectbotanyeconomic
