4 



3G4 1 loLM : Juxcus repexs Michx. 



Ju lints rcpcns shows no character by which it can be considered 

 generlcally distinct from any Juncus. Neither docs its morpho- 

 loijical characters taken from the vei^etative organs warrant any 



separation, and the peculiar septifragal dehiscence of its capsule, 

 upon which Desvaux established CcpJialoxys jIabcUata is not with- 

 out intercrradatincr forms within the genus. 



Bibliography. 



Buchenau, Franz. Monographia Juncacearum. (Engler's bot. 



Jarb. Vol. 12. Leipzig. 1890.) 



. Buchenau, Franz. Kleinere Ikntra^e zur Naturgcschichte der 



Juncaccen. (Abhdl. d. naturw. Verein. Bremen. 2 : 392. 1870.) 



Desvaux, N. A. Observations sur trois noiiveaux genres de 



la famille des Joncinees. (Journ. de Botanique. i: 321. 1808. 



Paris.) 



Engelmann, Gcorg. A revision of the North American species 



o{Jiincns with a description of new or imperfectl)-' known species. 

 (Trans. St. Louis Acad. Sci. 2: 424. 1865.) 



Kunth, C. S. Enumeratio plantanum. Stuttgart. 3 : 346. 



1S41. 



Michaux, A. Flora Boreah- Americana. I : 191. Paris. 1863. 



Schwendener, S. Die Mestomscheiden der Gramlneenblatter. 

 (Sitzungsber. d. k. Acad. Wiss. Berlin. 1 890: 305.) . 



Van Tieghem, Ph. Recherches sur la symetrie de structure 

 des plantes vasculaircs. (Ann. sc. nat. Botanique. 13 : Paris. 

 1870.) Sec also Journal de Botanique. i: 305. Paris. 



Brookland, D. C, I^Iarcli, 1899. 



Hxplaiiation of Plate j6j. 



Fig. I. Transverse section of half of the leaf- blade o{ Juncus rcpens. Ef., epi- 

 dermis of upper face ; Z, lacune ; ep., epidermi.s of lower surface, X 75- 



FlG. 2. Stoma from the leaf; Ep.^ epidermis of lower surface; Pn., pneumatic 



tissue, X 320- 



Fio. 3. T>arge mestmue-bundle from leaf, transverse section ; P., palisades; 5/., 



stereome; 7^*^., parenchyma-sheath ; J/. 5. , mestome-sheath ; Ep., epidcrmi.^ of lower 



■ 



surface, X 5^^* 



Fig. 4. Small mestome-bundle from leaf, transverse section ; letters as in Fig. 3, 



X5^o. 



Fig. 5. Stem-part, transver»ie scctio<i ; Ep., epidermis; B., bark; Z. , lacune; 



I\, pith, X75- 



Fig. 6. Transverse section of a part of the root; B., bark ; A, pericatnbium ; 

 P, Z., proto-lcptome ; P. IL, proto-hadrome ; V,, vessel ; C. T., conjunctive tissue; 

 Efid., endodctmis, X 4^*^* 



