. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. 132 Elementary Botany centre of the mouth. If a bee visits one of the flowers which has its pollen matured, in order to seek for honey, it will, on enter- ing the flower and plunging its proboscis into the tube, strike its head against the lower anther lobes, bringing the fertile lobes down against its sides, covering its body with pollen (c). If it now visits another flower in the same c
. Elementary botany : theoretical and practical. A text-book designed primarily for students of science classes connected with the science and art department of the committee of council on education . Botany. 132 Elementary Botany centre of the mouth. If a bee visits one of the flowers which has its pollen matured, in order to seek for honey, it will, on enter- ing the flower and plunging its proboscis into the tube, strike its head against the lower anther lobes, bringing the fertile lobes down against its sides, covering its body with pollen (c). If it now visits another flower in the same condition, it will simply have its stock of pollen increased ; but if it visits a flower which has its pistil bent over, evidently the stigmas will strike against the insect's back, and some of the pollen scattered there will adhere to the glutinous stigmatic surface. Other protandrous flowers are met with in the Mallows, the Geraniums, many Campanulas, the Pinks and other members of the Caryophyllaceffi, many Compositse, Umbelliferse, and others. Protogynous flowers are much less common, but they are met with amongst the Plantains, the Scrophularias, the Mag- nolias, and other species of plants. Another arrangement is known under the name of hetero- stylism, where the pistils and stamens of different flowers are of various lengths. A good example of a heterostylic flower is to be found in the common Primrose. If we examine a bunch of common Primroses we shall find the flowers of two different kinds. Some have a little knob filling up the mouth of the corolla tube, and others a rosette. On making a vertical section of one of each kind of flower, we 'find the arrangement as shown in fig. 253. In the first case we have the pistil with a long style (253, i.), the stigma of which forms the ' knob' filling up the corolla tube, whilst the stamens are placed low down in Fig. flower oiPri. the tube. In the Other case the mula. I. Long-styled, II. Short- styled form: a, c
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1888
