PHANEROGAMIA : FLOWEK8. 



393 



1. Seed-bads not curved, as naked nuclei (fig. 222. b\ or with one 

 (fig. 223.) or with two integuments (fig. 224). 



222 



ctT 



2. Reversed seed-buds, as naked nuclei (fig. 225.), or with one (fig, 226.) 

 or with two integuments (fig. 227.). 



227 



229 



3. Half-reversed seed-buds, with peltate mode of attachment (fig. 228.) 

 and erect (fig. 229.). 



*** Viscum album. Longitudinal section through the female flower, a, Point of 

 attachment (hilum) and chalaza ; b, end of the floral axis as seed-bud, forming a straight 

 naked nucleus ; c, boundary of the pith in the pedicel, in which the embryo-sacs are 

 also developed (two are shown in the figure) ; x, floral envelopes. 



223 Taxus baccata. Longitudinal section through the seed-bud, a, Hilum and cha- 

 laza ; b, nucleus ; c, embryo-sac ; d, simple integument ; e, large cells of the endosperm 

 (corpuscula Robt. Brown); g, micropyle ; and A, rudiments of the arillus. 



i24 Polygonum divaricatum. Seed-bud in longitudinal section, a, Hilum and cha- 

 laza ; 6, nucleus ; c, embryo-sac ; d, inner, and /, outer integument ; g, micropyle. 



KS Hippuris vulgaris. Seed-bud in longitudinal section, a, Hilum ; 6, naked nu- 

 cleus ; c, embryo-sac ; g, nuclear papilla ; h, chalaza ; r, raphe. 



26 Adoxa Moschatellina. Seed-bud in longitudinal section, a, Hilum ; b, nucleus ; 

 c, embryo-sac ; rf, simple integument ; g, micropyle ; h, chalaza ; r, raphe. 



47 Cucurbita Pepo. Seed-bud in longitudinal section, some time after impregnation, 

 a, Hilum ; 6, nucleus ; c, embryo-sac ; d, inner, and /, outer integument ; g, micropyle ; 

 h, chalaza ; r, raphe. 



8i8 Lemna trisulca. Seed-bud in longitudinal section. a, Hilum ; b, nucleus ; 

 c, embryo-sac ; rf, inner, and f, outer integuments ; g, micropyle ; h, chalaza ; 

 r, raphe. 



829 Meconostigma pinnatijidum. Seed-bud in longitudinal section. a, Spermophore, 

 funiculus, and hilum ; b, nucleus ; c, embryo-sac ; d, inner, and /, outer integuments ; 

 g, micropyle : A, chalaza ; r, raphe. 



