. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 388 ANGIOSPERMAE—DICOTYLEDONES mature earlier than the adjacent male ones. Warming considers the willows in Greenland (such as S. herbacea, &c.), which flower early and set fruits rapidly, as anemophilous, for the pollen is easily scattered by the wind, but Kornerus says that the fragrant catkins are also occasionally visited by Fig. 363. Salix lurbaaa^ L. (after Herm. Muller). A, Male plant (natural size). B. Male spike with five flowers. C. M
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 388 ANGIOSPERMAE—DICOTYLEDONES mature earlier than the adjacent male ones. Warming considers the willows in Greenland (such as S. herbacea, &c.), which flower early and set fruits rapidly, as anemophilous, for the pollen is easily scattered by the wind, but Kornerus says that the fragrant catkins are also occasionally visited by Fig. 363. Salix lurbaaa^ L. (after Herm. Muller). A, Male plant (natural size). B. Male spike with five flowers. C. Male flower, from outside, after the removal of the bract. D. Male flower, from inside. £. Female spike with six flowers. F. Female flower, from inside. G. Female flower, from outside, after removal of the bract. a, anther; dr, bract; gr^ style ; w and k', large and small nectaries ; ov, ovary ; si, stigmas. The species was found flowering on Bear Island at the end of June (Abromeit, 'Bot. Ergeb. von Drygalski's Gronlandsexped.,' p. 70). Visitors.—Herm. Muller (Alps) once observed a moth, and once a Muscid. Lindmann (Dovrefjeld) records flies and humble-bees. 2590. S. polaris Wahlenb. (Lindman, ' Bidrag till Kanned. om Skandin. Fjellvaxt. Blomn. o. Befrukt.')—Nectar is abundantly secreted in this species also. This species belongs to the earliest flowering plants of Spitzbergen, where it is in bloom from mid-June to July, fruits being set from the beginning of August to the beginning of September. A hybrid found on the island, S. herbacea x S. polaris (or possibly an intermediate species (?)), is interesting because one parent (S. herbacea) does not now occur there, and this indicates a former wider extension of that species, and a correspondingly altered climate (Andersson and Hesselman, ' Bidrag till Kanned. om Spetsbergens o. Beeren Eil. Karlvaxtflora,' pp. 67-9). Visitors.—Flies and humble-bees. 2591. S. reticulata L. (Herm. Miiller, op. cit., p. 163 ; Kerner, loc.
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