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Nymphaea pygmaea
Species of water lily From Wikipedia, the free encyclopedia
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Nymphaea pygmaea is a controversial species[3][2] of perennial, aquatic herb[2] in the family Nymphaeaceae[4] native to Asia.[5]
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Description
Vegetative characteristics
It is a perennial, aquatic herb with erect, cylindrical, unbranched rhizomes without stolons.[2] The obovate to orbicular, thick,[6] 5.5–24 cm long, and 4.5–21 cm wide leaves[2] with diverging basal lobes[7] have an entire margin.[2][8] The upper leaf surface is green to purple.[6] The petiole is slender.[7]
Generative characteristics
The white,[7] floating, 3–6 cm wide flower has four sepals[2] with an obtuse apex[7] and 5–17 petals[6] with an obtuse apex.[7] The androecium consists of 24–71 stamens. The gynoecium consists of 5-11 carpels.[6] The globose fruit bears ellipsoid to ovoid, 1.9–3.6 mm long, and 1.3–2.6 mm wide seeds.[2]
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Cytology
The chromosome count is 2n = 42[9] or 2n = 84. The ploidy level is 6x.[10]
Taxonomy
It was first published as Castalia pygmaea Salisb. by Richard Anthony Salisbury in 1807.[11] It was placed in the genus Nymphaea L. as Nymphaea pygmaea (Salisb.) W.T.Aiton by William Townsend Aiton published in 1811.[1] It is widely regarded as a synonym of Nymphaea tetragona Georgi.[12][1][13][14] The circumscription of Nymphaea tetragona in East Asia is however problematic and these problematic plants may be deserving of the status of a separate species Nymphaea pygmaea.[3] There are several studies supporting this separate status.[2][6][5]
Position within Nymphaea
Within the subgenus Nymphaea subg. Nymphaea, it is placed in the section Nymphaea sect. Chamaenymphaea,[15] of which it is the type species.[16] It is identified as the sister group to Nymphaea tetragona and Nymphaea leibergii based on nuclear ribosomal DNA,[5][2] but the relationships based on the analysis of the chloroplast DNA is unclear.[5]
Etymology
Ecology
Habitat
It occurs in lakes, ponds, marshes, and rice fields.[2]
References
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