ASCLEPIADACE^. 



535 



p. 230). They inhabit chiefly warm and tropical regions, but many 

 species extend to northern climates. Many succulent species are 



Fig. 756 . 



found ia the south of Africa. 



Fig. 769. Pig. 761. Fig. 760. 



In tropical India and Australia, and 



Figs. 763-761. Organs of fructification of Asclepias nivea, to illustrate the natural order 

 Asclepiadacese. Fig. 763. Diagram of the flower, with five divisions of the calyx, Ave 

 segments of the corolla, five stamens, and two ovaries. Fig. 754. The>entire flower, p, 

 CoroUa, with five lohes. a. Appendages forming the staminal crown (corona). Fig. 756. 

 The flower viewed from above, p p, Gamopetalous corolla with its five lobes, a a, Append- 

 ages forming the corona or crown, g g, Glandular bodies attached to the stigma, and 

 bearing the pollen-masses (pollinia). Fig. 766. The flower cut vertically, c. Calyx, jj. 

 Corolla, a a. Coronal appendages, c, Stamens, o, Ovary, s. Styles, which are united at 

 the upper part by.means of the large stigma, at the base of which, towards the points, p p, 

 the pollen tubes enter. Fig. 757. Two pollen-masses, to, attached by two prolongations, 

 (?, in the form of a caudicle or tail, to another body, g, formed by the union of two stigmatic 

 glands. 51, Pollen-grains with tubes beginning to escape from the masses. Pig. 758. One 

 of the pollen-grains, with its tube separated and highly magnified. Fig. 759. Fruit at the 

 period of dehiscence. //, Two follicles, p. Placenta, which is detached, g, Comose seeds. 

 Pig. 760. One of the comose seeds separated. . a, The hairy appendage at the hilum. 

 Pig. 761. Seed separated from the hairs and cut vertically. . te. External integument. U 

 Internal integument, p, Perisperm or thin albumen, e. Embryo, with leafy cotyledons 

 and superior radicle. 



