Calcareous morning glory

Exogonium microdactylum (Grisebach) House

Perennials, root relatively large, tuberlike. Stems trailing, twining, sometimes ± fleshy. Leaf blades elliptic or lanceolate, 30–100 × 10–40 mm overall, base cordate to truncate, surfaces glabrous, or ± orbiculate, (3–)5–7-lobed, incised nearly to petiole tip, lobes narrowly elliptic, linear, or oblong, 20–40 × 3–10 mm. Peduncles glabrous. Flowers diurnal; sepals oblong, orbiculate, or ovate, 6–7 mm, coriaceous, margins sometimes scarious, apex obtuse, sometimes mucronulate; corolla red, salverform, (25–)40–50 mm, limb 25–30 mm diam., weakly 5-lobed or notably 5-lobed in age.

Flowering year-round. Coppices, oölitic sites, open fields, pinelands; of conservation concern; 0–20 m; Fla.; West Indies (Bahamas, Cuba).