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  Nymphoides hydrophylla
  Citation:  Nymphoides hydrophylla (Lour.) O. Ktze., Rev. Gen. Pl. 2: 429. 1891; Ansari, Fl. Kasaragod Div. 237. 1985; Ramach. & V.J. Nair, Fl. Cannanore Dist. 293. 1988; Antony, Syst. Stud. Fl. Kottayam Dist. 253. 1989; Babu, Fl. Malappuram Dist. 452. 1990; Vajr., Fl. Palghat Dist. 297. 1990; Joseph, Aquatic Angiosp. Malabar 133. 1991; M. Mohanan & Henry, Fl. Thiruvanthapuram 308. 1994; Sasidh., Fl. Periyar Tiger Reserve 259. 1998; Sunil & Sivadasan, Fl. Alappuzha Dist. 451. 2009; Ratheesh Narayanan, Fl. Stud. Wayanad Dist. 548. 2009. Menyanthes hydrophylla Lour., Fl. Cochinch. 129. 1790. Nymphoides cristata (Roxb.) O. Ktze, Rev. Gen. Pl. 1: 429. 1891; Manilal & Sivar., Fl. Calicut 175. 1982. Menyanthes cristata Roxb., Pl. Corom. t.105. 1798. Limnanthemum cristatum (Roxb.) Griseb., Gen. Sp. Gent. 342. 1839; Hook. f., Fl. Brit. India 4: 131. 1883; Gamble, Fl. Pres. Madras 883(620). 1923.
  Malayalam Name(s): Cheruthettambel, Neythel
  Tamil name(s):
  English name(s):
  Description: Rhizomatous annuals or perennials; rhizome 0.5-1.5 cm thick. Primary fertile shoots many, uniphyllous, arising from the axils of scales on the rhizome. Secondary shoots zig-zag, sympodial, many-jointed, each joint bearing a single floating leaf. Leaves all fertile, floating, 6-10 cm across, ovate to orbicular, base deeply cordate, gland-dotted below, membranous; petiole to 2.5 cm long. Flowers bisexual and female, in umbellate clusters of 10 -20 at the junction of the branch and petiole; pedicels 3-4.5 cm long. Calyx deeply 5-partite; lobes 3-5 mm long, narrowly lanceolate. Corolla white with a yellow throat; tube c. 2 mm long with a ring of glandular hairs at the throat; lobes 5, 7-8 x 3-4 mm, with flexuous, membranous wings on the margins and a similar median longitudinal crest within. Stamens 5, highly reduced in female flowers. Ovary bottle-shaped with 5, minute, orbicular, disc glands at the base; stigmas 2-lobed. Capsule to 14 mm long, oblong. Seeds 4-6 in each capsule, to 2 mm across, discoid, brown.
  Habit: Herb
  Flowering & Fruiting: Throughout the year
  District(s): All Districts
  Medicinal: Yes
  Habitat: Ditches in grasslands and ponds
  Distribution: Indo-Malesia and South China
  Aquatic: Yes
  Epiphyte(s): No
  Saprophyte: No
  Stem parasite: No
  Root parasite: No
  Flower colour(s): White
  Weed: No
  Monocot/Dicot: Dicotyledonous Plants
  Exotic: No
  Garden: No
  Edible: No
  Vegetable: No
  Endemic to:
  IUCN status:
  Localities: Kumarikulam, Vallakkadavu, Ezhimala, on way to Mattanur, Kuthuparamba, Kalliassey, Palakkad, Olavakkot, Pallippuram, Mararikulam, Elavanchery-Nemmara
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