54 



ACADEMIC BOTANY. 



161) and the Canna (Fig. 

 63, C). 



90. Endogenous Growth. 

 — The embryo governs the 

 leaf and stem (32). In 

 Endogens the embryo has 

 one cotyledon, which sheathes 

 the plumule. The plants 

 there fo re have alternate, 

 sheathing, parallel - veined 

 leaves ; the veins run from 

 base to tip, as in the Grasses 

 (Fig. 51), or from midrib to 

 margin, as in the Banana 

 (Fig. 60). Sometimes the 

 leaves are net-veined, as in the Yam 

 (Fig. 89) and Smilax (Fig. 241) ; but 

 the net-veins are small, the parallel 

 veins being always strong and strongly 

 marked. The stems consist of cellular 



Fig. 59. — Blood - Flower 

 {SsemaTiiliua •nmUifioru%) ; bd. 

 of flB. ; If. cluster ; sepiirate fl. 



tissue interspersed with 

 wood-bundles; there is no 

 differentiation into pith, 

 wood, and bark ; the hard- 

 ened outer part, called the 

 Rind, is equivalent to bark ; 

 but it has not the structure 

 of true bark (as we shall 

 see in another Lesson), and 

 it is inseparable from the 

 stem. The stems of the 

 Indian Corn, Palm, and 



-Banana (Mtaa parodwmnt) ; plant, Banana are Solid (Fig. 61) J 



those of the Grasses — in- 

 cluding Bamboo, Cane, etc. — are hollow from the destruo- 



