3i8 



ANGIOSPERMAE—DICOTYLEDONES 



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 diflBcult. 



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

 skg. Lepidoptera (13), which usually eflfected 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. — i. Apis mellifica 



Z. 5, skg. ; 2. Bombus 

 hortorum L. 5, do.; 

 3. B. lapidarius L. ijj, 

 do. ; 4. Osmia rufa L. 

 5, skg. and po-cltg. 



753. R sibiricmn 

 Poir.— 



Visitors. — Loew 

 observed 2 humble- 

 bees (Bombus agrorum 

 F. 5, and B. rajellus 

 K. 5) 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 

 Botanic Garden. — i . 

 Megachile ericetorum 

 Lep. J, effecting pol- 

 lination ; 2. Halictus 

 leucozonius K., var. 



Fig. 10,^ Hedysarum abscurum, L. (after Herin. Miiller). A. Flower 

 seen from tlie side (x ij). B. Flower after removal of calyi, vexillum, and 

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

 from above. C. Ri^ht ala from the inside {B-D x 3J). a, anthers ; ca, calyx ; 

 c\ alar fold ; f^ vexillum ; Ji andy?', alar lamina and claw ; «, nectar.passage ; 

 (7, free upper filament ; ov^ ovary ; .? and s\ carinal lamina and claw ; v, 

 staminal tube. 



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 Za?;/.). (Herm. Miiller, 'Fertilisation,' 

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

 Bijdragen.') — Hermann Miiller 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-red 

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



