MORPHOLOGY AND ANATOMY OF THE NYMPILEACE.E. 209 



Figs. 10-11. Base of petiole of mature leaf of Victoria rer/ia (nat. size), 10. In surfaee view, showing 

 position of adventitious roots. 11. In section: ?7., root-bearing stele; p., pedieels ; /., air- 

 canals in the petiole. 



Fig. 12. Transverse section of the root-bearing stele of same plant ( x 80) : x., xylcm ; ph., })hl()em ; 

 e., cndodcrmis. 



Fig. 13. Portion of such a stele, more highly magnified (x225). 



Plate XXII. 



Fig. 14. Transverse section of the pedicel of an adventitious root of Victoria regia takiMi near its point 

 of origin from the root-bearing stele (x 155). 



Fig. 15. Plant of Nymphxea Jlava (f nat. size) : st., primary stolon, bearing buds, h., and tuberous 

 roots, r. Tlie stolon becomes slightly tuberous during its course at point p. ; /., leaf-scars on 

 rhizome. 



Fig. 16. Transverse section of the primary stolon of the same plant, showing four steles, two with four 

 bundles each, and two with three only ( x 25). 



Fig. 17. Stele of the same, more highly magnified ( X 150) : x., persistent xylem-clements ; «<,, sieve- 

 tubes ; p., phloem parenchyma ; e., endoderrais ; /., central canal with remains of protoxylem ; 

 h., stellate hair. 



Fig. 18, Thickened extremity of primary stolon (slightly enlarged) : pr.st., primary stolon; b., buds on 

 the same. The oldest has grown out into the secondary stolon, sc.st. The latter thickens 

 above to form the new rhizome, rz. /.', 1st leaf of new rhizome, /.^ the second, /.\ the third : 

 r., tuberous roots. ^ 



Fig. 19. Transverse section of secondary stolon (x30). Fonr vascular bundles present: a is a single 

 separate one ; b has been formed by the complete fusion of the two bundles of such a pair as 

 that at c. 



SECOND SERIES. — BOTANY, VOL. V. 



2 X 



