. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 27. Matthiola incana, R. Br. (from nature). (l) Flower; natural size. A', pouch at the base ot the calyr. (2) Stamens and pistil after removal of sepals and petals, the stamens spreading ; natural size : a\ anther of a long stamen ; a", anther of a short stamen; j, stigma; w, the ridge-ltke nectary surrounding the base of the shorter stamen. (3) Stamens and pistil; twice natural size : references as in (2). proboscis of an insect endeavouring to ge
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. Fig. 27. Matthiola incana, R. Br. (from nature). (l) Flower; natural size. A', pouch at the base ot the calyr. (2) Stamens and pistil after removal of sepals and petals, the stamens spreading ; natural size : a\ anther of a long stamen ; a", anther of a short stamen; j, stigma; w, the ridge-ltke nectary surrounding the base of the shorter stamen. (3) Stamens and pistil; twice natural size : references as in (2). proboscis of an insect endeavouring to get at one of the secreting nectaries, will be dusted with some of the pollen from the adjacent short stamen, and will transfer it to the stigma of another flower of the same species. Visitors.—In the jjarden of the Ober-Realschiile at Kiel, I observed a butterfly (Vanessa urticae Z.) visiting cultivated plants and sucking nectar, and as it visited several flowers in succession cross-pollination must have been effected. The proboscis (14-15 mm. long) of this insect can reach right down into the nectar- secreting base of the flower. In the same place I also noted Pieris sp., skg. 169. M. annua Sweet. (Nobbe, Bot. Centralbl., xxxii, 1887, p. 253; Knuth, ' Bloemenbiol. Bijdragen.')—F. Nobbe observed in cultivated plants that when the seeds germinated very rapidly (3-4 days), most or somedmes all of the flowers were double, but that—on the other hand—plants raised from seeds which germinated slowly usually bore fertile single flowers. The same investigator also found that if a variety of annual stock naturally inclined to produce double flowers was crossed with one chiefly bearing single flowers, the mongrel exhibited the peculiarities of the parent from which pollen was taken, not so much as regards the colour of 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
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