1 H 



Juncus repens Michx,— A Morphological and Anatomical Study 



Bv Thi:o. II(n,M 



(With Platk 363) 



Botanical literature alread}- possesses a number of \'a!uable 

 contributions to a knowledge of the Juncaceae from the writings 

 of Buchenau, Engclmann and Kunth, and the laborious works of 

 these authors have furnished botanists not only with diagnoses of 

 a number of species and varieties, but also with data relating to 



the natural histoi-)- of this order of plants. The 

 'Jiincaccanini is a work so complete and exact. 



?/// 



ncaccaruui is a work so complete and exact, that it is difficult 

 even for the field-botanist to detect an\- additional facts that are 



^ * 



worthy of being recorded. Therefore, in presenting some obser- 



Juncits rep 



to be considered only 



as supplemental to the diagnosis already given, and we desire be- 

 sides to show some peculiarities in the structure, which we no- 

 ticed contemporarily with our researches on the North American 

 species of Fbnhristylis. 



In a morphological respect Jmiciis rcpcns affords several points 

 of interest, and occurs under two forms, terrestrial and aquatic, 

 the first representing the most typical growth of the species. 

 Characteristic of both forms is, however, the profuse development 

 of vegetative shoots, especiall}' in the latter, where vegetati\'c propa- 

 gation predominates. Flowers develoj), nevertheless, in both forms, 

 even when the plant is submerged, but the typical floral shoots arc 

 to be found only on terrestrial sptximens. 



Although the rhizome is very short and cespitose, the plant 

 is, nevertheless, able to cover a large area b}' means of its \-ege- 

 tative shoots borne on prostrate stems with long internodes and by 

 rooting very freely. The structure of these prostrate stems is so 

 much like the flower-bearing ones, that they might be considered as 



modified floral shoots. They both are distinctly compressed and 

 provided with t>-pical leaves having sheaths and blades, but on 

 the vegetativ^e branches the flowers are replaced by fascicles of 

 shoots. The number of flowers and leafy shoots varies very 



(35I>) 



