92 



ANGIOSPERMAEDICOTYLEDONES 



unbidden guests, an Empid, a hover-fly, 2 bees, a fossorial wasp, a true wasp, 



2 Lepidoptera, and 4 beetles. MacLeod (Pyrenees), 4 short-tongued Hymenoptera, 



3 beetles, and 3 Muscids : none of these bore pollinia (Bot. Jaarb. Dodonaea, Ghent, 

 iii, 1891, p. 344). 



Fig. 255. Asclepias syriaca, L. (after Herm. Mtiller). (i) Flower after removal of sepals and 

 petals, seen from above (x ^i). (2) Do., from the side. (3) Do., after removal of the nectar-secreting 

 organs (cucuUi) (x 7). (4) Do., after removal of a stamen. (5^ The detached stamen, seen from 

 outside. (6) Inner side of do. (7) Nectar-secreting organ (cucuUus) ( x 3 J). (8) Do., in longitudinal 

 section, to show the conical process apposed to an anther. (9) Freshly extracted pollinia, seen from the 

 outside (X 7). (10) Do., when the torsion of the bands is half complete. (11) Do., when the torsion is 

 complete. (12) Longitudinal section of flower, after removal of sepals, petals, and cuculli. a, cucnllns; 

 by conical process of do. ; c, membranous process of connective ; d, outer side of locnius containing 

 a pollinium ; e, lateral wing of an anther, which with the corresponding wing of the adjacent anther 

 bounds a slit (y^, into which first the foot of an insect and then a pollinium is introduced; g, clip of the 

 upper end of a slit, united by bands (h) to two pollinia ("), from the adjacent loculi of different anthers ; 

 k, empty loculus of anther ; /, connective ; tn, cylinder surrounding the ovary and bearing the cncnlli and 

 stamens ; m, place of attachment of a cacullus ; o, stigmatic chamber ; p, fle^y stigmatic disk ; g, ovary. 



