Abstract
Hydrocotyle kollimalayensis, a new species is described and illustrated from Kolli hills of South Eastern Ghats, Tamil Nadu, India. The new species is morphologically closer to H. sibthorpioides, but differs from the latter by its filiform stem, glabrous peduncle, shorter petiole and narrower flowers. The most prominent features of the new species Hydrocotyle kollimalayensis are: stem filiform with silky setaceous hairs; leaves sparsely hirsute above and dense below, 5-lobed; flowers 6-12 per inflorescence with glabrous peduncle; and fruits ellipsoidal with 3 obscure ribs. A key to distinguish the new species from other Hydrocotyle species of Tamil Nadu, India is provided. We also inferred the relationship of H. kollimalayensis with allied species using molecular phylogenetic analyses based on nrDNA ITS sequence data.DOI: http://dx.doi.org/10.3329/bjpt.v21i2.21356Bangladesh J. Plant Taxon. 21(2): 167-173, 2014 (December)
Highlights
Hydrocotyle L. (Araliaceae) comprises some 130 species worldwide (Du and Ren, 2010).Most of them inhabit marshy, moist shady and understory environments in tropical and subtropical forests
The results revealed that these specimens belong to a hitherto undescribed species that is morphologically allied to H. sibthorpioides, H. conferta and H. javanica
Materials and Methods The morphological characters of Hydrocotyle kollimalayensis were critically studied, and further compared with related taxonomic literature (Clarke, 1879; Gamble, 1935; Mathias, 1936; Hiroe, 1979; Matthew, 1983, 1996; Mukherjee and Constance, 1993; Pullaiah et al, 2007), and herbarium specimens housed at Botanical Survey of India, Central National Herbarium, Howrah
Summary
Hydrocotyle L. (Araliaceae) comprises some 130 species worldwide (Du and Ren, 2010).Most of them inhabit marshy, moist shady and understory environments in tropical and subtropical forests. Km) of Hydrocotyle in Solakkadu area of Kolli hills with novel characters in the leaves, inflorescence, flowers and fruits, which were different from the other known species of Hydrocotyle. The results revealed that these specimens belong to a hitherto undescribed species that is morphologically allied to H. sibthorpioides, H. conferta and H. javanica. Based on extensive morphological and molecular studies, we describe and illustrate the species as a new entity, Hydrocotyle kollimalayensis S.
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