. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 276 ANGIOSPERMAE—DICOTYLEDONES Knuth (Kiel Ober-Realschule Garden, 26. 8.'97)—i. the bee Apis mellifica L. 5, occasional, skg. vigorously and effecting crossing; it obviously could not reach the base of the flower with its short (6 mm.) proboscis, not being able to force its head into the widened part of the corolla-tube; 2. the humble-bee Bombus terrester L. t>, freq., skg., and effecting crossing; its proboscis (7-8 mm.) could reach the nectar-storing b
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 276 ANGIOSPERMAE—DICOTYLEDONES Knuth (Kiel Ober-Realschule Garden, 26. 8.'97)—i. the bee Apis mellifica L. 5, occasional, skg. vigorously and effecting crossing; it obviously could not reach the base of the flower with its short (6 mm.) proboscis, not being able to force its head into the widened part of the corolla-tube; 2. the humble-bee Bombus terrester L. t>, freq., skg., and effecting crossing; its proboscis (7-8 mm.) could reach the nectar-storing base of the flower; 3. the hover-fly Rhingia rostrata Z., freq., skg., during which its proboscis (lo-ii mm.) was not entirely inserted into the corolla- tube, and was therefore dusted with pollen 2-3 mm. from its base ; the bees, on the other hand, brought the front of their heads into contact with stigma or anthers ; 4. and 5. the hover-flies Syritta pipiens L. and Syrphus balteatus Deg., both skg. and effecting either cross- or self-polhnation; 6. the Thysanopterid Thrips, frequent in the flowers and occasionally effecting autogamy. Loew (Berlin Botanic Garden), 3 bees, all skg.— i. Apis mellifica Z. 5 ; 2. Bombus agrorum ,; 3. B. terrester. 713. Horminum L. Protandrous bee flowers. Gynodioecism, rarely gynomonoecism. 2291. H. pyrenaicum L. (Kerner, ' Schutzmittel d. Bliiten,' p. 225; Herm. Miiller, ' Alpenblumen,' pp. 318-19; Schulz, ' Beitrage,' II, pp. 134-6; MacLeod, ' Pyreneenbl.,'pp. 327-31.)— The hermaphrodite flowers of this species are so strongly protandrous that automatic self-pollination is excluded. Schulz says that they vary in size. Besides hermaphrodite flowers there are often to be found smaller female ones with reduced anthers, generally growing on separate stocks, rarely on the same as the others. In the Pyrenees also (according to MacLeod), both protandrous hermaphrodite flowers and smaller, gynomo- noeciously distributed female ones occur; in f
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