Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Very local in sandy, moist fields and moist sandy shores.
The peduncles are generally strongly geniculate at the base, as are most of the spathes also.
This is a coastal plain disjunct, and may be confused with the similar Sisyrinchium strictum, which, however, has the stems minutely denticulate on the margins as in S. angustifolium.
The Midland Co. record mapped in Michigan Flora, Vol. 1 was based on a rare specimen of Sisyrinchium mucronatum with a branched inflorescence.