118 



BOTANY 



I'ART 1 



roots of the Podosteinaceae, and serve to attach them to rocks, arc 



Fig. 1-27. — Glandular hair from the 

 petiole of Primula sinensis. (After 

 DE Bary, X 142.) 



Fio. 128.— Glandular scale from the female inflores- 

 cence of the Hop, Humulus Lupulus, in vertical 

 section. A, before, B, after the cuticle has become 

 distended by the secretion. In B the secretion 

 has been removed by alcohol. (After de Bary, 

 X 142.) 



parenchymatous throughout, but vascular bundles may be included 

 Avithin emergences, as is well shown 

 in the club-shaped digestive glands 

 or tentacles (Figs. 130, 198) on the 

 leaves of the Sundew (Drosera). 

 Some emergences resemble in struc- 

 ture certain of the metamorphosed 



Fio. 120. — Glandular colleter from a stiimlo of 

 Viola tricolor, showing also a unicellular hair. 

 (X 240.) 



Fio. 130. — Digestive gland from Drosera 

 rotundifolia. (x 60.) 



members of the plant body described in the preceding chapter ; the 



