. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 558 ANGIOSPERMAE—DICOTYLEDONES 408. Cephalaria Schrad. 1293. C. alpina Schrad.— Visitors.—Loew (Berlin Botanic Garden) observed 2 humble-bees—Bombus hortorum L. 5, skg., and B. terrester L. 5, skg. and po-cltg. 1294. C. radiata Griseb. et Schenk.— Visitors.—Loew observed the following in the Berlin Botanic Garden.— A. Diptera. Syrphidae : i. Eristalis nemorum Z.; 2. E. tenax L.; 3. Syrphus albostriatus/a//.; 4. S. balteatus Z><g-.; 5. S. ribesiiZ. B. H
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 558 ANGIOSPERMAE—DICOTYLEDONES 408. Cephalaria Schrad. 1293. C. alpina Schrad.— Visitors.—Loew (Berlin Botanic Garden) observed 2 humble-bees—Bombus hortorum L. 5, skg., and B. terrester L. 5, skg. and po-cltg. 1294. C. radiata Griseb. et Schenk.— Visitors.—Loew observed the following in the Berlin Botanic Garden.— A. Diptera. Syrphidae : i. Eristalis nemorum Z.; 2. E. tenax L.; 3. Syrphus albostriatus/a//.; 4. S. balteatus Z><g-.; 5. S. ribesiiZ. B. Hymenoptera. Apidae: 6. Apis mellifica Z. 5, skg. and po-cltg.; 7. Bombus hypnorum Z. 5, skg.; 8. HaJictus cylindricus Z. S, do. 1295. C. uralensis Roem et Schult. ( = C. corniculata Roem et Schull.).— Visitors.—Loew observed the following in the Berlin Botanic Garden.— A. Diptera. Syrphidae: i. Syrphus ribesii Z.; 2. Volucella pellucens Z., skg. B. Hymenoptera. Apidae: 3. Bombus agrorum J<'. i, skg.; 4. B. terrester Z. 5, do.; 5. Psithyrus campestris Pz., var. rossiellus K. i, do. Also on the var. cretacea 3 bees—I. Bombus terrester Z. J, skg.; 2. Prosopis communis Nyl. 5 ; 3. Psithyrus rupeslris F. t, skg. 409. Knautia L. Flowers lilac or white in colour; arranged in conspicuous flat hemispherical inflorescences, belonging to class S. Gynodioecious, with protandrous hermaphrodite flowers. 1296. K. arvensis Coult. ( = Scabiosa arvensis Z., and Trichera arvensis Schrad.). (Sprengel,' Entd. Geh.,' p. 84 ; Herm. Miiller, ' Fertihsa- tion,' pp. 309-13, 'Alpenblumen,' ]). 399,' ,'Ill, pp. 76-7; Schulz, 'Beitrage,' II, pp. 173, 192; Knuth, 'Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 83-4, 156-7, ' Weit. Beob. ij. Bl. u. Insekt. a. d. nordfr. Ins.,'p. 235, 'Biutenbiol. Beob. in Thiiringen,' ' Biutenbiol. Beob. a. d. Ins. Riigen,' ' Bloem- enbiol. Bijdragen,' and other memoirs; Loew, ' Biutenbiol. Floristik,' pp. 390, 394, 398.)— In this species about
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