LEGUMINOSAE 



301 



either cross- or self-pollination may take place. The latter, however, is ineffective. 

 When the pressure is removed, the parts of the flower return to their original 

 positions. Automatic self-pollination, by the pollen surrounding the stigma of an 

 unvisited flower, does not take place, for it appears that the stigmatic papillae must 

 be rubbed before becoming receptive. Kerner states, however, that the flowers are 

 fertile when insects are excluded. Warnstorf describes the pollen-grains as very 

 small, shining, white, and smooth, resembling blunt-ended prisms in shape, with 

 a slight constriction in the middle. On an average they are 25 p long and 12 broad. 



Fig. 98. Lotus coruiculatus, L. (after Herm. Mailer), (i) Flower seen from the front. (2) Flower 

 seen obliquely from the side. (3) Flower after removal of the vexillum, seen from the side. (4) The 

 same, seen from above. (5) Flower after removal of the vexillum and alae, seen from the side, and 

 more highly magnified. (6) Flower after removal of the right half of the carina, seen from the right 

 side. (7) Flower after removal of the vexillum and alae, seen from above. (8) The stamens, style, and 

 stigma, enclosed in the anterior part of the carina, more highly magnified than in 6. (9) Stamens, style, 

 and stigma of a bud, immediately after the pollen has been shed ; removed from the flower and seen from 

 the side. The outer filaments have become thicker than they were in 8. (10) The same, seen 



from above ; the outer filaments, thickened at the end, spread out, being freed from the pressure of the 

 carina. (1 1) The nine united filaments of a fully developed flower spread out. a, nectar-passage ; b, up- 

 ward bend of the free filament ; c, depressions in the two carinal petals, into which projections (c 7 ) of tho 

 alae fit ; d, the five inner filaments that remain short ; e, the five outer filaments, which elongate and 

 become club-shaped ; f, stigma ; e-g, hollow cone of the carina filled with pollen ; g carinal opening from 

 which pollen is pressed out ; xy indicates corresponding parts of 6 and 8. 



Visitors. Hermann Mtiller (H. M.) in Westphalia, Buddeburg (Budd.) in 

 Nassau, and myself (Kn.) in Schleswig-Holstein (S.-H.), Riigen (R.) and Thuringia 

 (T.), observed the following. 



A. Hymenoptera. Apidae: (a) Dasygastres: i. Anthidium manicatum L. $> 

 (H. M.); 2. A. oblongatum Ltr., freq., 5, skg. and po-cltg., $ (H. M., Budd.) ; 3. A. 

 punctatum Ltr. 5 and S, do. (H. M., Budd.); 4. A. strigatum Ltr. 5 and J, do. 



