Coefficient of Conservatism:
Coefficient of Wetness:
Sandy meadows and lakeshores; this species is primarily a plant of the southeastern coastal plain, extending into the tropics. Michigan occurrences are evidently somewhat disjunct. The Kalamazoo collection mapped here was discussed in Michigan Flora, Vol. 1 under Juncus tenuis with the note that “a collection by Hermann & Hanes... may be this poorly understood taxon according to Hermann.”
Juncus interior Wiegand is has similar auricles to J. dichotomus and may well occur in Michigan, although no material has been located (despite reports from the state). It differs in having the perianth appressed-ascending rather than ± spreading and the bracteoles acuminate rather than blunt or merely acute. See Catling & Spicer (1987) for more details. It is more easily distinguished from from J. tenuis in having short, hardly prolonged auricles, and from J. dudleyi in having them thin-margined.