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Bacopa caroliniana:
Blue-hyssop
Bacopa caroliniana (Walt.) Robins: Blue-hyssop, lemon bacopa, Carolina water-hyssop. Scrophulariaceae (snapdragon family).
Native perennial. Emergent growth from rhizomes rooted in substrate of moist shorelines or where water is shallow. It can grow completely submersed in neutral to acidic water. Can crowd to form dense mats 12 in (30 cm) tall. The plant's tissues are succulent to fleshy and give off a lemon odor when crushed. Leaves are small (0.2 - 0.8 in; 0.5 - 2 cm), opposite, without leaf stalks, oval to wedge-shaped, with bases that partially clasp the slightly hairy stems. The leaves are covered with clear dots (glands) that produce the characteristic citrus smell. The 4- to 5-petaled blue flowers emerge singly on short stalks among the leaves at the top of the stem.
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