534 



A TEXT-BOOK OF BOTANY. 



stem with palmately lobed or divided leaves, and large, irregular, 

 blue flowers which form a rather loose panicle (Fig. 297). The 

 sepals are 5 in number, the posterior upper -one being large and 



E 



FIG. 297. Acomtum Napellus . A, one of the long-petiolate, divided leaves; B, epi- 

 dermal cells of lower surface; c, an epidermal cell of the upper surface; D, transverse sec- 

 tion through one of the principal veins showing two fibrovascular bundles, and strongly 

 collenchymatic cells beneath the lower epidermis; E, one of the few hair? from the petiole; 

 F, liuinified bast fibers surrounding the sieve in the petiole; G, longitudinal section through 

 fibro vascular bundle showing spiral arfd reticulate tracheae (t), bast fibers (b) and some 

 of the collenchyma cells (c), those at the left exhibiting longitudinal pores which give 

 a crystal-like effect. 



helmet-shaped. The petals are 2 to 5 and rather small ; the two 

 posterior or upper ones which are hooded and concealed in the 

 helmet-shaped sepal are nectar-secreting (Fig. 223, E). The fruit 

 is a follicle and contains numerous small seeds. 



