4o6 



ANGIOSPERMAE—MONOCOTYLEDONES 



Visitors. — George Darwin saw minute Hymenoptera (particularly Tetrastichus 

 diaphanthus Walk.), flies and beetles (Malthodes brevicollis Pqyk.). Herm. Miiller 

 observed dwarf ichneumon-flies. The poUinia cling to the joints of one of the 

 fore-legs of the insects, and, after having bent downwards, are pressed against the 

 stigma of a flower visited later. 



'^ " 822. Aceras R. Rr. 



B 



As Orchis. 



2630. A. anthropophora R. Br. 



(=;Ophrys anthropophora Z.). (Darwin, 

 op. cit., p. 26.) — Darwin states that the 

 flower mechanism of this species agrees 

 essentially with that of Orchis mascula 

 and its allies. 



823. Epipogum S. G. Gmel. 



Bee flowers. 



2631. E. aphyllum Sw. (Kerner, 



'Nat. Hist. PI.,' Eng. Ed. i,II, pp. 226, 257; 

 Rohrbach, ' Epipogium.') — The flowers of 

 this species possess a vanilla-odour, and 

 the perianth is yellowish in colour with 

 a flesh-red spur. The labellum is arched 



Fig. 375. Herminius alpinuni, Lindl. (after Herm. Miiller). A. Side view of a flower that has 

 been over for a considerable time. B, A young flower after removal of all the perianth leaves except the 

 labellum, seen directly from the front. C. A somewhat older flower, which has already lost its pollinia. 



D. A still further developed flower, seen from the side (x 7). .£^and F. Pollinia, seen from the front and 

 from the side. G. The middle of a young flower, seen from the front (X 35). a, anther; a' fl', vestigial 



anthers ; ar and a/, right and left anther-lobes ; dr, bract ; t, caudicle ; A, nectar ; ov, ovary ; fi', labellum ; 

 fio, pollinium ; rr, rostellum ; sf, stigma. 



