Family: Onagraceae (Evening primrose family)
Genus: Ludwigia
Botanical name: Ludwigia octovalvis
Sanskrit: Bhoolvananga
Hindi: Banlunga
English: Primrose willow
Malayalam: Kattukarayamboov, Kattukarayamb, Neergrambo
Willow Primrose is an erect, stout, well-branched robust herb of damp or flooded areas. It may be woody at the base and shrubby at times, growing up to 4 m. It has long stiff hairs sometimes appressed and oriented in one direction. Stems may be red-brown. Alternately arranged leaves are light green, may turn red upon aging, narrowly lanceshaped to ovate, up to 15 cm long, 0.4-4 cm wide, densely velvety both sides, narrowed at base and tip, 12- 22 veins on each side of midrib. Leaf-stalk is short. Sepals are 4, ovate or lanceshaped, 0.8-1.3 cm long by 1-7.5 mm wide. Flowers occur singly in leaf axils and at branch ends. Petals are 4, pale to bright yellow, 0.6-2 cm long, 0.4-1.7 cm wide, broadly obovate and may be shallowly notched at tip. Fruit is a thin-walled, 4-angled, narrowly cylindrical, 8-ribbed capsule, 3-5 cm long, 2-8 mm in diameter, velvety, terminated by persistent sepals, color by vary from green to pale or reddish brown, or purplish, stalk up to 1 cm. Willow Primrose differs from Water Primrose by its more erect habit and larger, lanceshaped leaves that are somewhat pointed.
Thee plant is astringent, carminative, vermifuge, laxative, diuretic, anti inflammatory, expectorant, anthelmintic and febrifuge and useful in dyspepsia, verminosis, flatulence, stranguary, dropsy, cough, asthma, diarrhoea, dystentery, cephalagia, orchitis, leucorrhoea and fever. The leaves are mucilaginous and used in malaya for poulting in headaches, orchitis, gland in the neck and nervous diseases.
Ludwigia octovalvis
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