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Pistia stratiotes (Water Lettuce, Shell-Flower)
| Date | Action |
| Feb 22 2009 | Netty (13946) added "< 6 inches (< 15 cm)" to Height (Maximum) |
| Feb 22 2009 | Netty (13946) added "11 (Above 40 F / Above 4 C)" to Zones / Hardiness |
| Feb 22 2009 | Netty (13946) added "Perennial" to Plant Types |
| Feb 22 2009 | Netty (13946) added "Water Plant" to Plant Types |
| Feb 22 2009 | Netty (13946) updated "water-lettuce" to "Water Lettuce" in Common Names |
| Feb 22 2009 | Netty (13946) added "Shell Flower" to Common Names |
