Helanthium tenellum (Martius ex Schultes f.) Britton. Common name: Mud-babies, Dwarf-burhead. Phenology: Aug-Sep. Habitat: On drawdown zones of Coastal Plain ponds, pineland ponds, pondcypress savannas in clay-based Carolina bays, blackwater riverbanks, or ponds in the Mountains with Coastal Plain affinities (Augusta County, VA); also apparently adventive on drawdown zones of artificial impoundments (Lake Chatuge, sw. NC and n. GA). Distribution: MA west to MI and KS, south to c. peninsular FL and s. TX, but widely scattered and disjunct in that range; also Mexico (CHP, GRO, VER), Central America, South America; West Indies. See Belden et al. (2004) for a discussion of the species in Virginia.

Origin/Endemic status: Native

Synonymy ⓘ: = K4, NE, NY, POWO, Lehtonen & Myllys (2008); = Echinodorus tenellus (Mart. ex Schult.f.) Buchenau — AqW, ETx1, F, FNA22, Il, Meso6, Mi, NS, Va, WH3; = Echinodorus tenellus (Mart. ex Schult.f.) Buchenau var. tenellus; = n/a — RAB; > Echinodorus parvulus Engelm. — G, GrPl, GW1, Tx; > Echinodorus tenellus (Mart. ex Schult.f.) Buchenau var. parvulus (Engelm.) Fassett — C, Mo1; > Helanthium parvulum (Engelm.) Britton — S, Tat; > Helianthium parvulum (Engelm.) Small — S13; Alisma tenellum Mart. ex Schult.f. Basionym: Alisma tenellum Mart. ex Schult.f. 1830

Links to other floras: = Echinodorus tenellus - FNA22

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: OBL
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily ⓘ: 9