John Leonard Riddell

Trillium nivale, the snow trillium or dwarf white trillium, is a species of flowering plant in the family Melanthiaceae. It is native to parts of the east and midwest United States, primarily the Great Lakes States, the Ohio Valley, and the Upper Mississippi Valley, as far north as central Minnesota. Trillium nivale is a perennial herbaceous plant that flowers late winter or early spring, occasionally while snow is still on the ground. Along the Ohio River valley, flowers may be seen in early March. At its northern limit in Minnesota, it blooms in early April. Along with the eastern skunk

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Scutellaria saxatilis is a species of flowering plant in the mint family (Lamiaceae), commonly known as rock skullcap. It is native to the southeastern United States, where it occurs on rocky woods, bluffs, and limestone outcrops.

Helianthus occidentalis (common names the fewleaf sunflower, nakedstem sunflower, or western sunflower) is a species of sunflower native to the Eastern and Central United States. It grows mostly in the Great Lakes Region and in the Ozarks, with additional populations scattered as far as Massachusetts, Texas, and the Florida Panhandle. Helianthus occidentalis differs from other, similar species by its sparse leaves, most of which are crowded around the lower part of the stem. This perennial plant reaches heights from 2 to 5 ft (60–150 cm). It produces one to several yellow flower heads, each

Solidago ohioensis is a North American plant species in the family Asteraceae, called the Ohio goldenrod. It is found primarily in the Great Lakes region of Canada and the United States, in Ontario, New York, Ohio, Michigan, Wisconsin, Indiana, and Illinois. Solidago ohioensis is a perennial herb up to 100 cm (39 inches) tall. The leaves are narrow, up to 25 cm (10 inches) long. One plant can produce as many as 500 small yellow flower heads in a compact branching array at the top of the plant. The plant grows in marshes, on sand dunes, and along the banks of rivers.

Linum sulcatum, common names yellow flax, grooved yellow flax, grooved flax, and yellow wild flax is a plant native to the United States and Canada.

Lactuca ludoviciana, the biannual lettuce, is a North American species of wild lettuce. It is widespread across much of central and western Canada and the western and central United States from Ontario west to British Columbia and south to Louisiana, Texas, and California. Most of the known populations are on the Great Plains; populations west of there may well represent naturalizations. Lactuca ludoviciana is a biennial herb in the dandelion tribe within the daisy family growing from a taproot a height of up to 150 cm (5 feet). The top of the stem bears a multibranched inflorescence with

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Symphyotrichum oolentangiense (formerly Aster oolentangiensis and Aster azureus), commonly known as skyblue aster and azure aster, is a species of flowering plant in the family Asteraceae native to eastern North America.

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Calliphysalis is a monotypic genus of perennial plants in the Physaleae tribe of the nightshade family Solanaceae. Calliphysalis carpenteri, known as Carpenter's groundcherry is the only recognized member of the genus. C. carpenteri is native to sandy soils on the coastal plain regions of south-eastern North America from northern Florida to Louisiana and Arkansas, it was first described from specimens collected in West Feliciana Parish, Louisiana. Its species name honors the botanical contributions of early Louisiana naturalist William Marbury Carpenter (1811-1848).

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