28 BOTANICAL GAZETTE [july 



5. Holm, Theo., Ruellia and Dianthera; an anatomical study. Box. Gaz. 

 43:308. 1907. 



6. Kruch, 0., Fasci midoll. d. Cichoriacees. Ann. R. Inst.Bot. Roma. 1890. 



7. Lignier, O., Anatomie des Calycanthees, des Melastomacees, et des 

 Myrtacees. Diss. Paris. 1887. 



8. Schaffnit, Ernst, Beitrage zur Anatomie der Acanthaceen-Samen. Inaug. 



Diss. Leipzig. 1905. 



9. Strasburger, E., Ueber den Bau und Verrichtung der Leitungsbahnen. 



J 



theory; a history and a criticism. Science 



Progress 5:133. 1896. 



11. Van Tieghem, Ph., Relation entre la production des cystolithes et la con 

 formation de la region stelique du petiole dans la nouvelle famille deJ 

 Acanthacees. Journ. Botanique 21:25. 1908. 



12. Van Tieghem et Douliot, Sur la polystelie. Ann. Sci. Nat. Bot. VII 



3:275. 1886. 



Vesque, J., Memoire sur Tanatomie comparee de l'ecorcc 

 Bot. VI. 2:82. 1875. 



Weiss, J. E., Das markstandige Gefassbiindelsystem in 

 zu den Blattspuren. Bot. Centralbl. 15:401-415. 1883. 



Ann 



EXPLANATION OF PLATES I-IV 



All 



xyl 



In the 

 In figs. 



3-9 the endodermis is represented by cells. The index letters are as follows: 

 A.R., adventitious root; 2J, bract; BR, branch; BR.T., branch trace; C, 

 carpel; C. B. central bundle; CL, calyx; CO T, cotyledon; CR, corolla; END, 

 endodermis; EP, epidermis; ESP, endosperm; I A., inflorescence axis; £, 

 leaf; L.T., leaf trace; M.PH., medullary phloem; P.B. peripheral bundle; 

 PC, procambium ; PPH, protophloem; P.R., primary root; PX, protoxylem; 

 5, stamen; ST, stem; T, testa; T.A., transverse arm. 



■ 



PLATE I 



Fig. 1. — Reconstruction of the vascular system of two adjacent mature 

 nodes. 



Fig. 2.— Diagram of the paths of the peripheral bundles of a mature stem. 



Figs. 3-8. — Series of successive transverse sections through a mature node, 

 passing from fig. 3, made just at the top of the node, to fig. 8, made just below 

 the node; X45. 



Fig. 9. — Transverse section through the upper part of an internode of an 

 old seedling, showing one central and four peripheral bundles; X45. 



Fig. 10. — Part of a sagittal section of a seed, directly opposite the micro- 

 pyle, showing the testa with its thickened epidermal cells, and the endosperm 

 of two layers; X185. 



