Flower ID: IMG_9651.JPG-09-23-2021 Flower name (scientific): Rorippa palustris (Linnaeus) Besser PY: 1821. Pronunciation guide: (phonetic spelling) ro-RIP-uh pal-US-triss Flower name (common): Bog Yellow-cress Family name (common): Mustard Family name (scientific): Brassicaceae Scientific name origin: Genus: Origin unclear, may be from the Latin form of rorippen, a Saxon vernacular name used by Euricius Cordus (1486 – 1535), a German physician and botanist. Specific epithet: Latin for swampy or marshy, referring to the habitat where this species is commonly found. Common name origin: Bog refers to one of the common wet habitats where the plant is found. Yellow from the flower color. Yellow-cress is a name in use for over four hundred years and is used to denote species in the genus Rorippa. The name cress with many different spelling forms goes back to old English over one thousand ago. Flower description: Size: 0.1 to 0.2 inches (3 to 5 mm) Petal count: 4 Color: yellow Other: flower arrangement, Raceme Plant description: Size: 18 to 40 inches (46 to 102 cm) Stem hairy: Other: Leaf description: attachment is alternate, type is simple and lobed Size: Basal leaves up to 20 to 30 cm long and up to 5 to 8 cm wide. Cauline leaves up to 10 to 18 cm long and up to 1 to 2.5 cm wide. Color: Hairy: Other: Shape: leaf, lyrate-pinnatisect (FNA) Origin (native, introduced, invasive): Native Status (common, uncommon, threatened, rare): Uncommon Bloom time (typical): May to October Cycle (annual, biennial, perennial): Annual/Biennial Habitat: Streambanks, bogs, swamps, marshlands, mudflats, lake and pond margins, disturbed wetlands, sun or semi-shade, wet soils. Fruit: Seed: Importance to wildlife: Similar species (if any): Rorippa palustris can be distinguished from other Rorippa species in part by flower size. R. palustris has flowers about 3 mm wide, Rorippa sinuata (Spreading Yellow-cress) and Rorippa sylvestris (Creeping Yellow-cress) both have flowers about 6 mm wide, and Rorippa sessiflora (Sessile-Flowered Yellow Cress) has flowers less than 3 mm wide. Rorippa sylvestris has slender fruits about 10 to 20 mm long and 1 to 1.3 mm wide, Rorippa sinuata has fruits about 5 to 12 mm long and 1.5 to 2.5 mm wide, Rorippa sessiliflora has fruits about 6 to 9 mm long and 1.8 to 2.8 mm wide, whereas Rorippa palustris has fruits about 4 to 10 mm long and 1.7 to 3 mm wide. Rorippa palustris is the most widely distribued of the Rorippa species found in Wisconsin. Ethnobotany: No recorded uses by tribes from Wisconsin. The Navajo used this plant as a ceremonial eyewash (Moerman, p. 482, 1998). Latitude: 44.800152 Longitude: -91.508055 Altitude: 229.30 Distribution: In Wisconsin: (Adams, Ashland, Barron, Bayfield, Brown, Buffalo, Burnett, Calumet, Chippewa, Clark, Columbia, Crawford, Dane, Dodge, Door, Douglas, Dunn, Eau Claire, Florence, Fond du Lac, Forest, Grant, Green, Green Lake, Iowa, Iron, Jackson, Jefferson, Juneau, Kenosha, Kewaunee, La Crosse, Lafayette, Langlade, Lincoln, Manitowoc, Marathon, Marinette, Marquette, Milwaukee, Monroe, Oconto, Oneida, Outagamie, Ozaukee, Pierce, Polk, Portage, Price, Racine, Richland, Rock, Rusk, Sauk, Sawyer, Shawano, Sheboygan, St. Croix, Taylor, Trempealeau, Vernon, Vilas, Walworth, Washburn, Waukesha, Waupaca, Waushara, Winnebago, Wood) Click here for distribution map In US: (AK, AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NV, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY) Click here for distribution map In Canada: (AB, BC, LB, MB, NB, NF, NS, NT, ON, PE, QC, SK, YT) Click here for distribution map References: Synonym(s): Basionym: Sisymbrium amphibium var. palustre Linnaeus Sp. Pl. 2: 657. 1753. Homotypic Synonym(s): Heterotypic Synonym(s): Autonym: na Wetland Status (NC): OBL Wetland Status (MW): OBL