Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Walters
S. chlorocarpum of Michigan Flora.
All kinds of moist and wet places: shores, bogs, lakes (in up to 6 dm of water), beach pools, stream borders.
Our most common single-styled species and certainly our most variable species, although only very rarely is the inflorescence branched. The stem is short (much surpassed by leaves) and the heads crowded (usually fewer and smaller) in plants referred to as subsp. acaule (Beeby) C. D. K. Cook & M. S. Nicholls, but the significance of this variation is unclear.
The heads are rarely all axillary in some populations, but such specimens may be placed here by the shiny, rather light green achenes with long ribbed beaks, the ribs extending onto the apical half of the achene (which is often dull and speckled with red on the lower half, below the constriction).