Micranthemum glomeratum

(Chapman) Shinners

Sida 1: 252. 1964.

Common names: Manatee mudflower
Basionym: Micranthemum nuttallii var. glomeratum Chapman Fl. South. U.S. ed. 2 repr. 2, 690. 1892
Synonyms: Hemianthus glomeratus (Chapman) Pennell
Treatment appears in FNA Volume 17. Treatment on page 358.

Leaves opposite or whorled; petiole 0–0.2 mm; blade elliptic to oblanceolate, 2.5–8.5(–15) × 0.5–3.1 mm. Pedicels 0.5–4 mm. Flowers chasmogamous; calyx irregularly symmetric, tube deeply lobed abaxially, 1.1–1.4 mm, tube 0.5–0.8 mm, lobes 0.5–0.7 mm; corolla strongly bilaterally symmetric, unilabiate or nearly so, 1.7–1.8 mm, longer than calyx, tube 0.5–0.8 mm, abaxial lobes 3, forming a prominent lip, 0.9–1 mm, lateral 0, adaxial (0–)0.7–0.8 mm. Capsules 1.1–1.3 × 0.9–1.2 mm. Seeds ellipsoid, 0.2–0.3 × 0.05–0.1 mm.

Phenology: Flowering spring–late summer.
Habitat: Margins of lakes and streams, sandy soils.
Elevation: 0–30 m.


Micranthemum glomeratum primarily occurs in the central part of the peninsula; it has not been found in the extreme southern counties. In the northern panhandle region, there is an outlier record from Gadsden County.

Selected References


Lower Taxa