114 ANGIOSPERMAE—DICOTYLEDONES 



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 HVDROPHYLLACEAE 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 in breadth and 37-5 /i 

 in length. 



Visitors. — Warnstorf observed the honey-bee, and Herm. MUller 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. Apidae : 5. Apis mellifica Z. 5, in very large numbers, skg. ; 6. Bombus 

 hortorum Z. 5 and 5, freq., skg.; 7. Halictus 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. Hydrophyllum L. 



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

 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 



