Abstract
Ranunculus shanyangensis M.R. Luo & L. Zhao, a new species of Ranunculaceae from Shaanxi, China, is described and illustrated. Ranunculus shanyangensis is morphologically similar to R. repens, however, it differs from the latter due to the following characters: longer adventitious roots, wholly creeping stems with no branches, longer rachis, fewer floral organs and pollen wall sculpturing. SEM micrography of thepollens for R. shanyangensis and R. repens are presented along with distribution map.DOI: http://dx.doi.org/10.3329/bjpt.v20i2.17394Bangladesh J. Plant Taxon. 20(2): 201-205, 2013
Highlights
Ranunculus is the largest genus within Ranunculaceae including about 600 species, primarily distributed in temperate to arctic or subantarctic zones, but a few species are found in high montane regions of the tropics (Tamura, 1995). Wang and Gilbert (2001) revised the genus Ranunculus in China and recognized 125 species in China, of which 66 are endemic.When we were carrying out a fieldwork survey in May 2009 in Shaanxi Province, China, we came across a distinct population of Ranunculus
Materials and Methods The specimens of Ranunculus repens from several herbaria (PE, WUK, NAS, IFP, LBG, IBSC, IBK) have been examined representing collections made in China as well as Europe and North America
Distribution: Ranunculus shanyangensis is found in the moist area in Shanyang County, Shaanxi Province, North-west China (Fig. 2)
Summary
Wang and Gilbert (2001) revised the genus Ranunculus in China and recognized 125 species in China, of which 66 are endemic. When we were carrying out a fieldwork survey in May 2009 in Shaanxi Province, China, we came across a distinct population of Ranunculus. Notable morphological characteristics that distinguish this population from other species include longer adventitious roots, longer rachis, wholly creeping stems that lack branches and fewer floral organs.
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