Coefficient of Conservatism:
Coefficient of Wetness:
Shores of lakes and ponds, river banks, fens, swamps, ditches, hummocks in marshes.
The very slender, even filiform, arcuate, scabrous (seen under a good lens) pedicels, make this species rather easy to recognize except when very young. The leaves are usually more linear than in G. tinctorium, but there is not enough consistency in shape (or scabrousness) for identification of vegetative material. The little retrorse barbules that make the leaf margins scabrous are short-conical, broadly triangular in aspect, like miniature rose prickles, and make this, G. tinctorium, and G. brevipes, rather easy to separate from G. obtusum and G. labradoricum, which have longer, straighter, and more slender bristly hairs along the leaf margins (as well as bearded nodes).