Salvinia natans (L.) All.
Salvinia natans (L.) All., Fl. Pedem. 2: 289. 1785; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 542, f. 64. 7. 1941; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 50. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 603, f. 60.4–8. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 97, 116. 2000. – Marsilea natans L., Sp. Pl. 2: 1099. 1753.
Stems branching irregularly, hairy. Floating leaves herbaceous, elliptic or narrowly so, 1–2 by 0.3– 0.6 cm, shortly stalked; upper surface covered with dense short projections bearing several prickle-like hairs at apex, lower surface bearing downy hairs. Sori crowded at base of submerged leaves, spherical , covered with soft hairs.
Distribution in Thailand
C. Europe, N India, China, Japan, N Vietnam and Java.
Floating in water in open places.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread outside of Thailand and not under any known threat.
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