Keywords: Crassula aquatica.tif la Crassula aquatica An illustrated flora of the northern United States Canada and the British Possessions 3 vols Charles Scribner's Sons New York Vol 2 206 http //plants usda gov/java/largeImage imageID tiaq2_001_avd tif Britton N L and A Brown 1913 PD-old Crassula aquatica |