. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SOLANACEAE 159 Cross-pollination by insects is only favoured in the feebly protogynous flowers, or in homogamous ones when the stigma projects beyond the anthers. Automatic self-pollination is easily possible and generally inevitable. Kerner found that autogamy was effected, as in Hyoscyamus, by elongation of the corolla for almost \ cm. Visitors.—In the Kiel Botanic Garden I observed (29. 8.'96) the hawk-moth Macroglossa stellatarum Z., skg. Also, in the Ga
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SOLANACEAE 159 Cross-pollination by insects is only favoured in the feebly protogynous flowers, or in homogamous ones when the stigma projects beyond the anthers. Automatic self-pollination is easily possible and generally inevitable. Kerner found that autogamy was effected, as in Hyoscyamus, by elongation of the corolla for almost \ cm. Visitors.—In the Kiel Botanic Garden I observed (29. 8.'96) the hawk-moth Macroglossa stellatarum Z., skg. Also, in the Garden of the Kiel Ober-Realschule, several honey-bees creeping into the flowers and remaining there for some seconds, so that they probably were able to suck some nectar, and might have effected cross-pollination. 2040. N. rustica L. (Sprengel, 'Entd. Geh.,' p. 125; Kirchner, 'Flora v. Stuttgart,' p. 573; Focke, Kosmos, Leipzig, vi, 1879-80, p. 473; Conies, ' Ult. stud.')—The corolla of this species is yellowish-green with a short tube. The filaments bend over the ovary to the style, but diverge from it higher up. Their lower parts are clothed with soft hairs, which protect the nectar from rain, and leave only five narrow passages to it. Comes describes the species as self-fertile. Focke observed that humble-bees visited the hybrid N. rustica x N. paniculata, stealing the nectar by perforating the corolla, but they took no notice of the parent species N. rustica. 636. Physochlaina G. Don. 2041. P. orientalis G. Don. (Loew, ' Bliitenbiol. Beitrage,' II, pp. 50-2.)— The dull-violet net-veined corolla of this species is a gradually widening tube of 18-20 mm. long, 4 mm. broad below, and 12 mm. above. The anthers protrude from its throat, and the style projects 6 mm. beyond them. Nectar is secreted by a swelling at the base of the ovary. The length of the style and the marked protogyny ensure crossing by insect visitors. Visitors.—Loew (Berlin Botanic Garden) observed 2 bees
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