3 i8 



ANGIOSPERMAEDICOTYLEDONES 



and anthers protrude from the carina, pressing against its ventral surface. As the 

 stigma projects about 2 mm. beyond the anthers, it is the first to emerge, so that 

 cross-pollination is assured, and self-pollination rendered difficult. 



Visitors. Herm. Mtiller chiefly observed skg. or po-cltg. humble-bees (5), and 

 skg. Lepidoptera (13), which usually effected cross-pollination. Bombus mastrucatus 

 Gerst. also obtained nectar by perforating the flowers. 



In the Riesengebirge, A. Schulz noticed humble-bees, and also flowers per- 

 forated by them. 



Loew saw the following bees in the Berlin Botanic Garden. 1. Apis mellifica 



Z. 5, skg. ; 2. Bombus 

 hortorum L. 5, do.; 

 3. B. lapidarius Z. 5, 

 do. ; 4. Osmia rufa Z. 

 5, skg. and po-cltg. 



753. H. sibiricum 

 Poir. 



Visitors. Loew 

 observed 2 humble- 

 bees (Bombus agrorum 

 F. 5, and B. rajellus 

 K. $>) skg., in the Berlin 

 Botanic Garden. 



754. H. corona- 

 rium L. This is an 

 Italian species. 



Visitors. Von 

 Dalla Torre saw 3 

 bees in the Innsbruck 



FIG. 103. Hedysarum obscurum, L. (after Herm. Mttller). A. Flower 'R r .tor>iV Par^pn f 



seen from the side (x ij). B. Flower after removal of calyx, vexillam, and -DOtaniC Uaraen. l. 



alae, and depression of the carina, seen from the side. D. The same seen Mejrachile ericetOruni 

 from above. C. Right ala from the inside (B-D x 3$). a, anthers ; ca, calyx ; . 



e\ alar fold; f, vexillum; ./Tandyf, alar lamina and claw; , nectar-passage ; Lep. 5, effecting pOl- 



0, free upper filament; ov, ovary; s and .$', carinal lamina and claw; v, r na ri'nn ' T-falirLllS 



leucozonius K., var. 

 nigrotibialis D.-T., do.; 3. Megachile maritima K. <$, freq. 

 Schletterer records the same for the Tyrol. 



226. Onobrychis Toum. 



Red nectar-yielding bee flowers, with simple valvular arrangement. 



755. O. viciaefolia Scop. (=0. sativa La?n.). (Herm. Mtiller, 'Fertilisation,' 

 pp. 200-1, 'Weit. Beob.,' II, p. 263; Schulz, 'Beitrage'; Knuth, ' Bloemenbiol. 

 Bijdragen.') Hermann Mtiller says that the flower mechanism of this species agrees 

 essentially with those of Melilotus and Trifolium. The stigma and anthers pro- 

 trude from the carina when this is weighed down by an insect visitor, resuming 

 their original position as soon as the pressure is removed. The vexillum is rose-rec 

 with darker streaks, and the carina of a brighter red. The alae are greatly reduced 



