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Wiesneria triandra
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Family:
ALISMATACEAE
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Citation: Wiesneria triandra (Dalz.) Micheli in A. & C. DC., Monogr. Phan. 3: 82. 1881; Joseph et al., Journ. Bombay Nat. Hist. Soc. 77: 169. 1980; M. Mohanan & Henry, Fl. Thiruvanthapuram 500. 1994; Joseph, Aquatic Angiosp. Malabar 266. 1991.
Sagittaria triandra Dalz. in Hook.'s, J. Bot. Kew Gard. Misc. 2: 144. 1850.
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Malayalam Name(s):
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Tamil name(s):
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English name(s):
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Description:
Aquatic plants in shallow water in paddy fields, gregarious, semi-submerged, caespitose, monoecious; roots many, long, white spongy. Leaves radical, numerous, lamina ca 14.0 x 0.7 cm, linear, keeled, especially towards the base, obtuse at tip; petiole ca 20.0 x 0.6 cm, constricted at the joint with the lamina, obtusely trigonous in cross section, aerenchymatous, broadened into a sheathing base. Inflorescence receme, axillary, ca 20 cm long, erect; peduncle ca 18 cm long, obtuse trigonous; flowering axis sharply trigonous with unisexual flowers arranged at very short intervals; floriferous portion ca 2 cm long, narrow with 5 or 7 whorls; lower 2 (or 3) whorls with pistillate flowers (or very rarely 3rd whorl with both sex flowers) and upper whorls with staminate flowers, sometimes the upper most whorls sterile, intervals of whorls (especially the lower ones) elongating very much after fertilization. Flowers white, bracteate, trimerous. Female flowers shortly pedicellate; bracts three, connate at base, ca 3.0 x 2.0 mm, erect, trapezoid, truncate and subentire at apex, slightly accrescent; sepals three not spreading, ca 3.0x 2.0 mm, erect, ovate, obtuse, slightly accrescent in fruit: petals three, alternating sepals, ca 1.0 x 0.5 mm, ovate or obovate to ligulate, obtuse, persistent; pistils 3 or 4, ca 2.0 x 0.75 mm, flask shaped; ovary globose to ovoid, abruptly narrowed into a short neck and ending in a bilobed stigma; lobes of stigma broadly auricular, warted on the receptive surface: staminodes three, triangular, ca 0.75 mm long, thick, acute. Male flowers about 3.5 mm across: pedicel ca 1.75 mm long; bracts three, similar to those of female flowers; sepals three, spreading, ovate to obovate, slightly connate at base, obtuse to rounded at tip, subequal, longer one ca 2.0 x 1.25 mm; other two sepals ca 1.5 x 1.0 mm; petals three, much smaller than sepals, as large as the petals of female flower, obovate, rounded at tip; stamens three, antisepalous, ca 1.5 mm long: filaments ca 1.0 mm long, dilated towards base; anthers large, conspicuous, basifixed, anther lobes reniform: pistillodes usually three, ovoid. Fruits subglobose or ovoid with short apical beak, one seeded; embryo curved.
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Habit:
Herb
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Flowering & Fruiting:
August-November
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District(s):
Thiruvananthapuram, Malappuram
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Medicinal:
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Habitat:
Flooded paddy fields
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Distribution:
Peninsular India
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Aquatic:
Yes
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Epiphyte(s):
No
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Saprophyte:
No
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Stem parasite:
No
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Root parasite:
No
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Flower colour(s):
White
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Weed:
No
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Monocot/Dicot:
Monocotyledonous Plants
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Exotic:
No
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Garden:
No
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Edible:
No
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Vegetable:
No
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Endemic to:
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IUCN status:
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Altitude:
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Localities:
Kottur R.F.
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