. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 267 643. G. sagittalis L.âKirchner ('Flora v. Stuttgart,' p. 474) stales that, like G. germanica, this species possesses a simple non-explosive valvular mechanism. The column, made up of style and stamens, protrudes from the carina during insect- visits, moving back again when the pressure is removed. The anthers dehisce in the bud, and as the slightly up-curved style extends but little beyond them at this stage the stigma is self-pollinated. Aft
. Handbook of flower pollination : based upon Hermann MuÌller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LEGUMINOSAE 267 643. G. sagittalis L.âKirchner ('Flora v. Stuttgart,' p. 474) stales that, like G. germanica, this species possesses a simple non-explosive valvular mechanism. The column, made up of style and stamens, protrudes from the carina during insect- visits, moving back again when the pressure is removed. The anthers dehisce in the bud, and as the slightly up-curved style extends but little beyond them at this stage the stigma is self-pollinated. After the vexillum has become erect, the style, which is still bent slightly upwards, projects about i mm. beyond the anthers, so that when a bee settles on the flower the stigma first projects from the carina and touches its ventral surface. The second flower visited by an insect is therefore cross-pollinated. Should considerable pressure be exerted, the carina remains depressed as in G. germanica. Visitors.âKirchner observed undetermined species of Apidae. Schenck saw two sternotribous bees, Megachile circumcincta K. and Trachusa serratulae Pz. 644. G. anglica L.âIn this species, which was first thoroughly described by Hermann Miiller (' Fertilisation,' pp. 192-3), the opposite tensions of style and stamens on the one hand, and of the carina and alae on the other, are much less pronounced. The carina and alae sink down but little when explosion takes place, and only the style curves upwards, its tip at the same time curling inwards. Visitors.âHerm. Miiller observed the honey-bee as a visitor. This almost ex- clusively visited unexploded flowers, assuming a position as if it would suck concealed nectar from their bases, and filling its pollen-baskets with its second legs. Herm. Miiller also repeatedly saw two short-tongued bees po-cltg., Andrena fulvicrus K. 5 and Halictus cylindricus F. j. Alfken and Hoppner (H.) observed the following bees at Bremen.â I. Andrena
Size: 2387px × 1047px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheroxfor, bookyear1906
