ORCHIDEAE 



417 



When the insect visits a somewhat older flower, in which the labellum has moved 

 away a Httle from the column, the pollinia are brought into contact with the stigma. 



Fig. 386. Goodyera ref ens, R.Br. (,z.ite.rHe.rm.WiX\^x). /?. Flower, seen from the side. 5. Do., 

 after removal of the two lateral sepals and the glandular hairs. C. Inner surface of the upper sepal. 

 D. Exterior of the right petal. B. Reproductive organs and labellum, in their natural position, seen 

 from the side. F. Reproductive organs, after removal of the pollinia and mucilage (x 7). G. Stigma 

 and rostellum, seen from below. H. Lateral view of the reproductive organs (x 24). Z Pollinia with 

 mucilage, seen from below (x 35). a, anther; a', vestigial do.; co, corolla; n, nectar receptacle; 

 ov, ovary ; p, lateral petals ; /', labellum ; po, poUinium ; r, rostellum ; s, lateral sepals ; s', upper sepal ; 

 St, stigma. 



Visitors. So far only humble-bees have been observed, e. g. Bombus pra- 

 torum Z., by R. B. Thompson (North Scotland), and B. mastrucatus GersL, by Herm. 

 Miiller (Alps). The latter is inclined to think, however, that the true pollinators are 

 small short-tongued insects, to which the structure of the flowers is adapted. 



832. Corallorrhiza Hall. 

 Nectar concealed. 



2648. C. innata R. Br. (=Ophrys Corallorrhiza Z.). (Herm. Miiller, 'Alpen- 

 blumen,' pp. 77-8.) The flowers of this species are greenish-yellow in colour with 

 a white labellum, and are dotted with dark-red in the throat. It may be concluded 

 from their small size that they are visited by small insects, which use the anterior 

 downwardly bent part of the labellum as an alighting-platform, and creep thence to 

 the nectar secreted and concealed at the steeply downwardly bent base of this organ. 

 In doing so they strike against the projecting rostellum, remove the clinging pollinia 

 on their upper-side and transfer them to another flower. 



833. Malaxis Soland. 

 Small, inconspicuous, insect flowers. 



2649. M. paludosa Sw. ( = Ophrys paludosa Z.). (Darwin, op. cit., p. 129U) 

 The labellum of the small, inconspicuous, greenish flowers of this species serves 



