. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 346 A NGIOSPERMA E—DICO T YLEDONES which the two styles project about i-| mm., while the two anthers are situated about a mm. below the mouth of the flower. Schulz observed gynomonoecism or gynodioecism occurring frequently or •sometimes even exclusively. The terrestrial form (var. ierresin Leers) possesses short hairs on the stalks, which secrete a viscid fluid serving as a protection against creeping insects; the aquatic form (var. nutans Moench) is glabro
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 346 A NGIOSPERMA E—DICO T YLEDONES which the two styles project about i-| mm., while the two anthers are situated about a mm. below the mouth of the flower. Schulz observed gynomonoecism or gynodioecism occurring frequently or •sometimes even exclusively. The terrestrial form (var. ierresin Leers) possesses short hairs on the stalks, which secrete a viscid fluid serving as a protection against creeping insects; the aquatic form (var. nutans Moench) is glabrous, the surrounding water giving access to none but flying insects. Visitors.—Knuth (Fohr) observed the following.— A. Diptera. (a) Muscidae : all po-dvg.: i. Aricia incana W/ed. i ; 2. Coenosia ligrina/^. 5; 3. Lucilia sp.; 4. Scatophaga merdaria i^.; 5. S. sp. (I/) Syrphidae : (>. Eristalis sp., po-dvg. B. Hymenoptera. Apidae : 7. Apis mellifica L. 5, po-cltg. and skg.; 8. Halictus cylindricus F. 5, po-cltg. C. Lepidoptera. Rhopalo- cera : 9. Coenon)mpha pamphilus Z., skg. The following were recorded by the observers and for the localities stated.— MacLeod (Flanders), the hover-fly Eristalis tenax L. (Bot. Jaarb. Dodonaea. (jhent, vi, 1894, p. 375). Scott-Elliot (Dumfriesshire), a Muscid, a hover-fly, and several Dolichopodids ('Flora of Dumfriesshire," p. 149). 2475. P. Persicaria L. (Herm. IMiiller, 'Fertilisation,' p. 512; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 128, 166; Verhoeff", ' Bl. u. Insekt. a. d. Ins. Nor- derney '; Schulz, ' Beitriige'; Kirchner, ' Flora v. Stuttgart,' pp. 216-17.)—The flowers of this species belong to classes C to EC. They are small, odourless, white or reddish in colour, rather poor in nectar, and united into crowded inflorescences ; a certain conspicuousness is thus attained, and insect-visits are fairly frequent; cross-pollination is therefore possible, though automatic self-poUination often takes place. Ther
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