Vernon M. Bates

Polygonella robusta, also known as Polygonum nesomii, is a shrubby perennial flowering plant in the buckwheat (Polygonaceae) family. It is endemic to the U.S. state of Florida where it is a member of the sandhill plant community. Common names for it include largeflower jointweed and sandhill wireweed. P. robusta produces an abundance of flowers that are surrounded by papery bracts which range in color from white and light pink to deep rose. After flowering, usually in October, the plant maintains a rosette of basal foliage through the winter.

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Hydrophyllum brownei, or Browne's waterleaf, is a rare North American plant species found only in the Ouachita Mountains in Arkansas. It grows in forested hillsides above the Cossatot River in Howard County, as well as in Polk and Garland Counties. Hydrophyllum brownei is an herb up to 50 cm (20 inches) tall, spreading by means of underground rhizomes. Leaves are pinnately compound, the leaflets very often pinnately lobed, with short bristly hairs. Flowers are lavender to almost white, 10–12 mm long.

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