Aquatic and Wetland Vascular Plants of the Northern Great Plains
45. Scrophulariaceae, the Figwort Family
2. Bacopa Aubl. -- Water hyssop1. Bacopa rotundifolia (Michx.) Wettst.
Small, amphibious perennial with stems 0.5-4 dm long, floating in shallow water or sprawling on mud and rooting at the nodes, emersed or ascending at the tips, pubescent on emersed portions. Leaves opposite, sessile, rotund-ovate to rotund-obovate, 1-3.5 cm long, 0.7-2.5 cm wide, conspicuously palmate-veined with 7-13 nerves, rounded at the apex, clasping at the base. Flowers axillary, 1-several per axil, on stout, pubescent, ultimately recurved pedicels 4-15 mm long; calyx of 5 unequal, distinct and imbricate sepals 4-5 mm long; corolla white with a yellow throat, nearly regular, narrowly campanulate, 6-10 mm long, the 5 lobes shorter than the tube; stamens 4. Capsule globose to subglobose, about equaling the calyx. Jul--Sep. Mud flats and shallow water of ponds and marshes; occasional mainly in the e and c parts; (IN to MT, s to MS, TX and AZ). Hydranthelium rotundifolium (Michx.) Pennell.
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