. Un manuel de botanique pour les collèges et universités ... La botanique. REPRODUCTION ET DISPERSION 841 bee (Apis) et le bourdon (Bombus) sont les plus efficaces de tous les insectes pollinisateurs, en raison de leur remarquable et maintien de l'activité de l'ouverture à la clôture de la saison de floraison, en raison de leur précision, ce qui permet de rapides et successives de pollinisation de plusieurs individus de la même espèce, et parce qu'ils visitent les fleurs pour le pollen et de nectar. Leurs jambes poilues sont bien adaptés pour transporter le pollen, et leur long probosces leur permettre de sécuriser en nectar clo partiellement

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. A textbook of botany for colleges and universities ... Botany. REPRODUCTION AND DISPERSAL 841 bee (Apis) and the bumblebee {Bombus) are the most efficient of all pollinating insects, because of their remarkable and continued activity from the opening to the close of the flowering season, because of their precision, which insures the successive and rapid pollination of many individuals of the same species, and because they visit flowers for pollen as well as for nectar. Their hairy legs are well suited for carrying pollen, and their long probosces enable them to secure nectar in partially closed or tubular flowers (figs. 1166-1169). Among the flowers that are almost entirely dependent upon bees for polhnation are those with irregular {zygomorphic) corollas, as in the legumes, the violets, and many of the mints; in certain instances (as in the clovers and aconites) the natural distribution area is confined to those parts of the world frequented by bees. The bees are diurnal insects and visit only diurnal flowers, and it commonly is thought that they have a high color sense and a keen sense of smell which aid them in detecting the presence of flowers. The wasps are of minor importance as pol- linating insects, though some flowers are pollinated chiefly by them (as in the figwort). Moths and butterflies. — The butterflies and certain moths (classed in the Lepidoptera) are nectar-feeders, and they possess greatly elongated and special- ized mouth parts, known as maxillary laminae. The butter- flies, like the bees, are diurnal insects and are able to get nectar from deeply hidden parts of the flower; as a rule, they visit showy and fragrant flowers (such as various honeysuckles and pinks). Most remarkable, perhaps, are the hawk moths (Sphingidae), a group consisting chiefly of nocturnal insects with maxillary laminae of great length (up to 80 mm.), which are coiled when not in use (fig. 1170)^ The nocturnal hawk moths visit flowers rapidly and with the precision of be

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• bookcentury1900
• bookdecade1910
• booksubjectbotany
• bookyear1910