. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. J 24 A NGIOSPERMAE—DICO T YLEDONES B. 608. Nonnea JNIoench. 1973. N. pulla DC. ( = N. erecta and L3'copsis pulla Z.).—The flowers of ihis species are of a dark or light purple-brown colour, rarely bright yellow or almost white. Visitors.—Friese observed the following 7 bees in Hungary.— I. Eucera hungarica Friese i; 2. E. difilcilis Pe'rez; 3. E. interrupta Baer; 4. E. nitidiventris Macs. J; 5. E. parvicornis 6. E. clypeata Er. $; 7. E. chrys
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. J 24 A NGIOSPERMAE—DICO T YLEDONES B. 608. Nonnea JNIoench. 1973. N. pulla DC. ( = N. erecta and L3'copsis pulla Z.).—The flowers of ihis species are of a dark or light purple-brown colour, rarely bright yellow or almost white. Visitors.—Friese observed the following 7 bees in Hungary.— I. Eucera hungarica Friese i; 2. E. difilcilis Pe'rez; 3. E. interrupta Baer; 4. E. nitidiventris Macs. J; 5. E. parvicornis 6. E. clypeata Er. $; 7. E. chrysopyga Pe'r. S. Schulz noticed perforated flowers here and there at Halle ('Beitrage'). 609. Symphytum Tourn. Honiogamous bee flowers; with nectar secreted by an annular ridge at the base of the ovary, and stored in the base of the corolla. According to Kerner, the peduncle bends down in late anthesis, so that the flower assumes a nodding or pendulous position, and the stigma is brought into the line of fall of the pollen, thus rendering automatic self-pollination inevitable. 1974. S. officinale L. (Sprengel, ' Entd. Geh.,' pp. 93-4 ; Herm. Muller, 'Fertilisation,' pp. 408-9, ' Weit. Beob.,' HI, p. 14; Kerner, 'Nat. Hist. PL,' Eng. Ed. I, II, p. 275; Kirchner, 'Flora v. Stuttgart,' p. 556; Knulh, ' Bloemenbiol. I^ijdragen '; Schulz, ' Beitrage,' II; Loew, ' Bliitenbiol. Floristik,' pp. 279-80.)—The drooping flowers of this species are white or violet-purple in colour, and their mechanism ixsembles that of Borago. The bell-shaped corolla is 14 mm. long, and it is contracted above for a distance of 8 mm., so that only long-tongued insects can suck the nectar legitimately. At the junction of the narrow and broader portions of the corolla there are triangular hollow scales, alternating with the filaments and covering the spaces between them. The spiny edges of these appendages prevent visitors from probing for nectar between the filaments, and they are obliged to insert th
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