16 BOTANICAL GAZETTE [JANUARY 
9- re E. C., A new key to the phylogeny of the monocotyledons. Science 
N. 5. 37: eee. 1903. 
10. CHRYSLER, M. A., The development of the central cylinder of Araceae and 
Liliaceae. Bor. GAZETTE 38: 161-184. pls. 12-15. 1904. 
11. PLowMan, A., The comparative anatomy and phylogeny of the Cyperaceae. 
Annals of Bot. (ined.) vol. 20. 
EXPLANATION OF PLATES I AND II, 
PLATE I. 
Fic. 1. Avena barbaia; leaf-trace bundle in the leaf-sheath 1™™ above its 
insertion on the stem. 130. 
2. Same; swollen and amphivasal condition of a leaf-trace bundle in 
the middle region of node. X 130. 
Fic. 3. Phalaris arundinacea; section through upper part of a node; near 
the outside are the leaf-trace bundles, alternating large and small; just internal 
to these are the nests of amphivasal bundles. X30 
1G. 4. Same; one of the nests of amphivasal bundles more magnified; on 
three ie are leat bic bundles. X 150. 
Fic. 5. Zea Mays; one of the large amphivasal bundles from a node of x 
reproductive branch. 115. 
Fic. 6. Zizania aquatica; part of stele and cortex in basal region of the stem. 
Two gaps with their leaf-trace bundles are visible. 35. 
PLATE II. 
Fic. 7. Panicularia americana; section 1™™ above node, showing two 
cortical sae X45. 
ame; section from upper part of the node, just above insertion of 
Kskakoa. The cortical bundles are connected by a ring-shaped anastomosis. 
x45. 
Fic. 9. Avena barbata; bundle from a young stem 1™™ above insertion of 
the leaf-sheath, showing cambium. X 150. 
IG. 10. Same; bundle from the same position in a mature stem. 150. 
Fic. 11. Andropogon argenteum; bundle from the leaf-sheath 1-2™™ above 
its insertion on the stem, showing cambium. X 150. 
Fic. 12. Erianthus Ravennae; bundle from the stem a short distance above 
anode. X150. 
et Spe 5 eae 
Sen 
