• Scientific Name: Limnophila sessiliflora Blume
• Ref: Bijdr. 749. 1826
• Synonyms:
  Hottonia sessiliflora Vahl, Symb. Bot. 2: 35. 1791;
  Ambulia sessiliflora (Vahl) Baillon ex Wettstein;
  L. taoyuanensis Yang & Yen.
• English Common Name: limnophila
• Chinese Common Name: 石龙尾 shi long wei
• Family: Scrophulariaceae
• Genus: Limnophila
• Distribution: Ponds, swamps, rice fields, wet places along streams; below 1900 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Henan, Hunan, Jiangsu, Jiangxi, Liaoning, Sichuan, Taiwan, Yunnan, Zhejiang [Bhutan, India, Indonesia (Java), Japan, Korea, Malaysia, Myanmar, Nepal, Sikkim, Sri Lanka, Vietnam].

 Perennials, amphibious. Submerged stems slender, long, glabrous or subglabrous. Aerial stems 6-40 cm, simple or sparsely branched, eglandular hairy, rarely subglabrous. Submerged leaves 0.5-3.5 cm, multiparted; segments flattened or capillary. Aerial leaves whorled; leaf blade elliptic-lanceolate, 5-18 X 3-4 mm, glabrous, densely glandular punctate, margin crenate to lobed; veins 1-3. Flowers sessile or rarely with a pedicel to 1.5 mm, solitary in axils of submerged and aerial leaves. Bracteoles absent or rarely present and to 1.5 mm. Calyx 4-6 mm, eglandular hairy, without raised veins in fruit; lobes 2-4 mm, ovate, apex narrowly acuminate. Corolla purple-blue to reddish, 6-10 mm. Capsule compressed, subglobose. Fl. and fr. Jul-Jan.(Flora of China)