Wiesneria triandra (Dalzell) Micheli

Aquatic emergent herb in temporary water puddles

Red List Category & Criteria: Least Concern ver 3.1 Year Assessed: 2010 Assessor/s: Watve, A. Reviewer/s: Narasimhan, D., Rao, M.L.V., Ravikumar, K., Juffe Bignoli, D. & Kumar, V.S. Contributors: Molur, S. Justification: Wiesneria triandra is endemic to the coastal Konkan-Malabar plains of western Indian states Maharashtra, Goa, Karnataka, Kerala. Its primary habitat is natural temporary water pools on lateritic plateuas (ferricretes) in the region. Although this type of habitat is limited in area, and heavily disturbed due to biotic pressure, the plant can grow in secondary habitats such as waterlogged fields which are plenty in the region. Some fluctuations in the population have been observed in population studied in Kerala (Camenisch and Cook, 1996) but on the whole the species is more or less commonly known from many localities within the region and has faced no specific reduction in population. It has many mature individuals spread over a large area. Thus, it is a species of Least Concern as per present assessment. Assessment History: 1997– Rare (Walter and Gillett 1998) Conservation Actions: No major conservation measures have been taken for the plant. Few experimental cultivation trials have been made and they were successful. Although the plant is thriving well in secondary habitats, it is necessary to protect its primary habitat, temporary pools on ferricretes (rocky lateritic outcrops) which are severely affected by biotic pressures. List of Conservation Actions: 1, 1.2, 2, 2.1, 2.2, 2.3, 3, 3.3, 3.3.1, 3.3.2, 3.4, 3.4.1, 3.4.2, 4, 4.3, 5, 5.1, 5.1.3

Flowering period: August- September

by water

30 cm tall

Herbs, 30 cm tall, scapigerous. Leaves 5-12X0.4-0.9cm, linear lanceolate, obtusely keeped on the back. Petioles sheathing. Scapes with flowers near the apex. Whorls of flowers 6-8, of which the lower are female, and upper male. Flowers white, usually three in a whorl. Achenes 0.3-0.5cm long, ovoide, apiculate.

Not available

temporary puddles on lateritic rocky areas and rice fields

autotrophy; primary producer

The Genus Wiesneria is insufficiently studied. W. triandra was originally described in 1850 from Malvan Sindhudurg district in the southern most part of the state of Maharashtra by Dalzell in the Kew Journal of Botany (@, p. 144).

System: Aquatic, temporary puddles and waterlogged areas. Habitat: temporary water pools on rocky plateaus of laterite and secondarily in waterlogged rice fields.

Habitat and Ecology: The species has been observed and reported by many floristic workers in the region, in addition to the reference used. Primary habitat are temporary pools on laterite plateus especially ferricretes below 50 m ASL in the region. Secondary habitats are man-made wetlands like pools, ditches, rice fields, lotus ponds, etc. Systems: Freshwater List of Habitats: 5, 5.8, 6, 14, 14.1, 14.2, 15, 15.2

Endemic

Locally abundant

stable

Population: The reference cited includes autecological studies of this species from around four sites. Population studies are not available from any of the other localities in Goa, Karnataka or Maharashtra. Population Trend: Unknown

Not known

Primary habitats much disturbed, but secondarily abundant. IUCN redlist status: Red List Category & Criteria: Least Concern ver 3.1 Year Published: 2011 Assessor/s: Watve, A. Reviewer/s: Narasimhan, D., Rao, M.L.V., Ravikumar, K., Juffe Bignoli, D. & Kumar, V.S. Contributor/s: Molur, S.

Red List Category & Criteria: Least Concern ver 3.1 Year Assessed: 2010 Assessor/s: Watve, A. Reviewer/s: Narasimhan, D., Rao, M.L.V., Ravikumar, K., Juffe Bignoli, D. & Kumar, V.S. Contributors: Molur, S. Justification: Wiesneria triandra is endemic to the coastal Konkan-Malabar plains of western Indian states Maharashtra, Goa, Karnataka, Kerala. Its primary habitat is natural temporary water pools on lateritic plateuas (ferricretes) in the region. Although this type of habitat is limited in area, and heavily disturbed due to biotic pressure, the plant can grow in secondary habitats such as waterlogged fields which are plenty in the region. Some fluctuations in the population have been observed in population studied in Kerala (Camenisch and Cook, 1996) but on the whole the species is more or less commonly known from many localities within the region and has faced no specific reduction in population. It has many mature individuals spread over a large area. Thus, it is a species of Least Concern as per present assessment. Assessment History: 1997– Rare (Walter and Gillett 1998) Conservation Actions: No major conservation measures have been taken for the plant. Few experimental cultivation trials have been made and they were successful. Although the plant is thriving well in secondary habitats, it is necessary to protect its primary habitat, temporary pools on ferricretes (rocky lateritic outcrops) which are severely affected by biotic pressures. List of Conservation Actions: 1, 1.2, 2, 2.1, 2.2, 2.3, 3, 3.3, 3.3.1, 3.3.2, 3.4, 3.4.1, 3.4.2, 4, 4.3, 5, 5.1, 5.1.3

Habitat disturbance.

Major Threat (s): The main threat to the primary habitats viz temporary pools on lateritic plateuas is conversion of land for industrial/ residential or agriculture which is going on at rapid scale throughout the region. However, ability of this species to grow in secondary man-made waterlogged habitats reduces the chances of rapid decline. However, these are not considered as major threats. List of Threats: 1, 1.1, 1.2, 1.3, 3, 3.2, 4, 4.1, 7, 7.2, 7.2.1, 9, 9.1, 9.1.1, 9.3, 9.3.2

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