114 ANGIOSPERMAEDICOTYLEDONES 



the style describes rotatory movements, bringing the stigmas into contact with the 

 anthers, so that automatic self-pollination necessarily takes place, and this is 

 effective. 



589. CoUomia Nutt. 



1942. C. grandiflora Dougl. (Ludwig, Bot. Ztg., Leipzig, xxxv, 1877 ; 

 Scharlok, op. cit., xxxvi, 1878.) Ludwig and Scharlok state that this species is 

 cleistogamous. 



1943. C. linearis Nutt. (Comes, ' Ult. oss.') Comes describes this species 

 as self- fertile. 



LXX. ORDER HYDROPHYLLACEAE DC. 

 (including HYDROLEACEAE ENDL.) 



Literature. A. Peter, * Hydrophyllaceae,' in Engler and Prantl's ' D. nat. 

 Pflanzenfam.,' IV, 3 a, p. 57. 



590. Phacelia Juss. 



1944. P. tanacetifolia Benth. (Warnstorf, Verb. bot. Ver., Berlin, xxxvii 

 and xxxviii, 1896.) The flowers of this species are feebly protandrous. The style 

 only bears stigmatic papillae on its extreme tip, and is at first curved inwards. The 

 anthers dehisce a little before it straightens itself. Willis says the flowers are capable 

 of automatic self-pollination (J. Linn. Soc., Bot., London, xxx, 1895). 



The pollen-grains are of a pale bluish colour, biscuit-shaped, smooth, with 

 several longitudinal streaks: they measure about 16-19 /* i^^ breadth and 37*5 /* 

 in length. 



Visitors. Warnstorf observed the honey-bee, and Herm. Milller noticed the 

 following in his garden at Lippstadt (' Weit. Beob.,' Ill, p. 9). 



A. Coleoptera. i. Dasytes flavipes F.^ po-dvg. ; 2. Meligethes sp., po-dvg. 

 Staphylinidae : 3. Tachyporus obtusus Z., its mouth-parts busy with the anthers. 

 B. Diptera. Syrphidae : 4, Rhingia rostrata Z., skg. and po-dvg. C. Hymeno- 

 ptera. Aptdae: 5, Apis mellifica Z. 5. in very large numbers, skg.; 6. Bombus 

 hortorum Z. j and 5, freq., skg.; 7. Haliclus sexnotatus K. 5, do.; 8. Osmia rufa 

 Z. 5, do. 



1945. P. divaricata A. Gray. Willis states (op. cit.) that the flowers of this 

 species are capable of automatic self-pollination. 



1946. P. campanularia A. Gray ; 1947. P. Whitlavia A. Gray ; and 1948. 

 P. Parryi Torr. Willis states (op. cit.) that these species bear large brightly 

 coloured flowers, adapted for cross-pollination. 



591. Hydrophylliim L. 



Flowers protandrous; with completely concealed nectar, secreted by the base 

 the ovary, and stored in a cavity of the petals. 



1949. H. virginicum L. (Francke, Inaug. Dissert., Halle, 1883; Loew, 

 ' Bliitenbiol. Beitrage,' I, pp. 21-4.) The flowers of this species are almost exclu- 

 sively allogamous. Loew states that the nectar secreted in the base of the flower 



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