Ranunculus flammula var. filiformis (greater creeping spearw

Spiranthes romanzoffiana (hooded lady's tresses)
Spiranthes vernalis (spring lady's tresses)
Spirodela polyrhiza
Sporobolus clandestinus (rough dropseed)
Sporobolus compositus var. compositus (composite dropseed)
Sporobolus compositus var. drummondii (Drummond's dropseed)
Sporobolus cryptandrus (sand dropseed)
Sporobolus heterolepis (prairie dropseed)
Sporobolus indicus var. indicus (smut grass)
Sporobolus junceus (pineywoods dropseed)
Sporobolus neglectus (puffsheath dropseed)
Sporobolus pyramidatus (Madagascar dropseed)
Sporobolus vaginiflorus (poverty dropseed)
Sporobolus virginicus (seashore dropseed)
Sri Lanka
Stachys alopecuros
Stachys cordata (heartleaf hedgenettle)
Stachys hyssopifolia (hyssopleaf hedgenettle)
Stachys latidens (broadtooth hedgenettle)
Stachys palustris
Stachys recta
Stachys sylvatica
Steinchisma hians (gaping grass)
Stellaria alsine
Stellaria alsine (bog chickweed)
Stellaria aquatica
Stellaria borealis ssp. borealis (boreal starwort)
Stellaria corei (Tennessee starwort)
Stellaria crassifolia var. crassifolia (fleshy starwort)

Image of Ranunculus flammula var. filiformis (greater creeping spearw 1
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 107.