. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 536 ANGIOSPERMAE—DICOTYLEDONES Visitors.—Herm. Miiller observed 12 Hymenoptera (including 5 species of humble-bees), 3 Syrphidae, 2 beetles, and 3 Lepidoptera. Ricca noticed Bombus lapidarius Z., even at an altitude of 2,000-2,500 mm. 1227. L. alpigena L. (Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, p. 278; Schulz,' Beitrage,' II, pp. 95-7 ; Herm. Miiller, ' Fertilisation,' p. 298, ' Alpenblumen,' pp. 395-7.)—This species bears reddish-brown flowers belonging
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 536 ANGIOSPERMAE—DICOTYLEDONES Visitors.—Herm. Miiller observed 12 Hymenoptera (including 5 species of humble-bees), 3 Syrphidae, 2 beetles, and 3 Lepidoptera. Ricca noticed Bombus lapidarius Z., even at an altitude of 2,000-2,500 mm. 1227. L. alpigena L. (Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, p. 278; Schulz,' Beitrage,' II, pp. 95-7 ; Herm. Miiller, ' Fertilisation,' p. 298, ' Alpenblumen,' pp. 395-7.)—This species bears reddish-brown flowers belonging to class Hav, which are visited and pollinated by bees, humble-bees, and especially wasps. The pouch of the corolla-tube secretes very abundant nectar, protected by many hairs. The lower lip, directed obliquely downwards, forms a convenient platform for visitors. These must first encounter and touch the stigma, and then the anthers, so that cross-poHination is necessarily Fig. 178. Lonicera alpigena^ L. (after Herm. Miiller). A pair of flowers soon after opening, seen from the front (X4). The one on the right sitle possesses a supernumerary stamen, but no corresponding corolla-lobe. While Hermann Miiller describes the flowers as homogamous, Kerner says they are protogynous, and that crossing is only possible at first, self-pollination being inevitable later on as the result of contact between stigma and anthers. Visitors.—Herm. Miiller observed 9 Hymenoptera (including great numbers of 2 species of wasps), 2 Syrphidae, 2 Lepidoptera, and 2 beetles. Schulz specially noticed the diurnal hawk-moth Macroglossa stellatarum L. 1228. L. iberica Bieb.—Cultivated plants of this Caucasian species were investigated by Kirchner in Wurtemberg ('Beitrage,' pp. 62-3). The bright yellow flowers are slightly protogynous; the lower part of the corolla-tube rises abruptly to a height of 10 mm., and its upper part is 3 mm. long. The under-lip (10 mm. in length) is downwardly r
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