| MARS | any of various small aquatic birds of the genus Gallinula distinguished from rails by a frontal shield and a resemblance to domestic hens |
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| MARS | North American coot |
| MARS | scouring-rush horsetail widely distributed in wet or boggy areas of northern hemisphere |
| MARS | European perennial plant naturalized in United States having triangular ovate leaves and lilac-pink flowers |
| MARS | swamp plant of Europe and North America having bright yellow flowers resembling buttercups |
| MARS | North American herb having whorled leaves and terminal clusters of flowers spotted with purple |
| MARS | any of several orchids of the genus Dactylorhiza having fingerlike tuberous roots |
| MARS | scrambling perennial of damp or marshy areas of Eurasia and North America with purplish flowers |
| MARS | pink-flowered marsh plant of the eastern United States |
| MARS | a semi-aquatic plant that grows in soft wet land |
| MARS | any of various plants of the genus Limonium of temperate salt marshes having spikes of whit or mauve flowers |
| MARS | perennial marsh herb with pink to mauve flowers |