J uncus 



JUNCACEAE 



297 



o 55 



Map 613 



Juncus scirpoides Lam. 



5o 



Map 614 



Juncus brachycarpus Engelm. 



To 



Map 615 



Juncus acuminatus Michx. 



13. Juncus brachycephalus (Engelm.) Buch. (Juncus canadensis var. 

 brachycephalus Engelm.) Map 611. Frequent in the northern half of 

 Indiana, becoming common in the lake area. It is often associated with 

 other rushes, especially with /. nodosus, on low sandy or marly borders of 

 lakes, in marshes and sloughs, and on springy calcareous terraces. 



A form of this species having six stamens instead of the more usual 

 three has been named J. brachycephalus f. hexandrus Martin (Rhodora 

 40 : 460. 1938) and Deam no. 54539A in the Herbarium of the University 

 of West Virginia is designated as the type. The six-stamened condition is 

 frequent in J. brachycephalus (as in /. canadensis and related species) ; in 

 fact most of the Indiana collections have at least a few of the flowers with 

 six stamens. As a rule a single plant will have flowers predominantly either 

 3-stamened or 6-stamened ; occasionally the number will be about equally 

 divided between the two, but rarely, if ever, is a plant found in which all 

 of the flowers have reverted to the 6-stamened state. 



Maine to Wis., southw. to N. J., Pa., and 111. 



14. Juncus diffusissimus Buckley. Map 612. Common in southern Indi- 

 ana, especially in the unglaciated area, in roadside ditches, low fallow 

 fields (mostly in hard white clay soil), swampy open woods, and along the 

 banks of or on gravel bars in creeks. 



N. Y. to Ind. and Kans., southw. to Tex. and Ga. 



15. Juncus scirpoides Lam. Map 613. Known in Indiana from only the 

 dune area where it is found in open, wet sandy habitats. Of the 22 collec- 

 tions seen from Lake and Porter Counties only one was made later than 

 1913. Previous to that date the species apparently was frequent to fairly 

 common on the dunes. 



No specimen could be found to confirm the reports of Barnes and of Coul- 

 ter from Jefferson County. In all probability these reports were based upon 

 collections of Juncus brachycarpus, a species common in Jefferson County 

 and superficially resembling /. scirpoides. J. brachycarpus is the only one 



