Wolffia brasiliensis
Annales des Sciences Naturelles, Botanique sér. 3, 12: 170. 1849.
Fronds boatshaped, 0.5–1.6 mm, 1–1.5 times as long as wide, 0.3–0.7 times as deep as wide, rounded at apex, papilla usually prominent in center of upper surface (tent-shaped); upper surface intensely green, with 50–100 stomates; pigment cells present in vegetative tissue (visible in dead fronds as brown dots). 2n = 20, 40, 42, 50, 60, 80.
Phenology: Flowering (rare) late spring–early fall.
Habitat: Mesotrophic to eutrophic, quiet waters in temperate to subtropical regions
Elevation: 0–1000 m
Distribution
Ala., Ark., Calif., Conn., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mass., Mich., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Oreg., Pa., S.C., Tenn., Tex., Va., Wash., W.Va., Wis., Mexico, West Indies, Central America, South America
Discussion
I know of no specimens of Wolffia brasiliensis from Rhode Island.
Selected References
None.
Lower Taxa
"-0.7timesasdeepaswide" is not declared as a valid unit of measurement for this property.