Limnophila sessiliflora
Asian marshweed
submerged glabrous, aerial to 20 cm, glabrous or pubescent with eglandular and glandular hairs.
opposite;
blade of submerged leaves ovate to broadly ovate in outline, 10–35 × 10–15 mm, segments flattened or capillary, blade of aerial leaves elliptic to lanceolate, 10–30(–80) × 2–5(–10) mm.
axillary, flowers solitary, rarely paired.
0–2 mm in flower, 0–4 mm in fruit;
bracteoles 0–1.5 mm.
cleistogamous submerged, budlike; chasmogamous aerial;
calyx 3–5 mm, lobes lanceolate, 2–4 mm;
corolla tube white, 8–10 mm, lobes blue-purple, 0.9–1.2 × 1–1.5 mm;
stamens 4–6 mm;
style 1–3 mm.
often sulcate, slightly compressed, 2–2.5 mm.
brown to dark brown, conic to cylindric.
Limnophila sessiliflora
Bentham (in N. Wallich 1828[–1849]) seems to have been the first to correct the spelling by Blume from sessiflora to sessiliflora, and later works have generally accepted the corrected epithet. Some works treat Hottonia sessiliflora Vahl as the basionym, but no homotypy has been established between the two names.
Limnophila sessiliflora is the more common species of the genus found in North America. It is a problematic weed in rice fields and shallow ponds worldwide; it has been placed on the Federal Noxious Weed List (http://www.aphis.usda.gov/plant_health/plant_pest_info/weeds/downloads/weedlist.pdf). It is also sometimes sold in the aquarium trade under the name L. indica.
An uncommon hybrid with Limnophila indica (L. ×ludoviciana Thieret) is distinguished by its ebracteolate pedicels 5–10 mm and calyx lobes 1–2 mm with eglandular trichomes (D. Philcox 1970). Some of the plants identified as the hybrid are actually L. sessiliflora with pedicellate flowers, a condition found throughout the range of the species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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