Thanks a lot, Ritesh ji. On 08-Dec-2017 11:58 AM, "Ritesh Kumar Choudhary" <[email protected]> wrote:
> Please also check the high resolution image of DSC_0451 for the presence > of recurved prickles. There seems to be mixture of P. nepalense as well. > DSC_457, 459, 448 and 450 are not matching well with P. sagittata. They are > probably P. nepalense. > > P. sagittata is a polymorphic species. Pl see the quote from Fl. China: > *Polygonum* *sagittatum* s.l. is an extremely variable species and known > from both Asia and North America. Some authors have pointed out, on the > basis of differences in achene surface and leaf margin, that North American > populations are separable from Asian ones, and have treated them as two > distinct varieties of *P*. *sagittatum*, or as two distinct species: *P*. > *sagittatum* in North America and *P*. *sieboldii* in eastern Asia. In > Park’s previous taxonomic monograph of *P*. sect. *Echinocaulon*(Syst. > Bot. 12: 167–179. 1987; and Mem. New York Bot. Gard. 47: 1–82. 1988), *P* > . *sagittatum* and *P*. *sieboldii* are recognized as conspecific mainly > based on flavonoid chemistry and also the observation that North American > plants are well within the range of variability of eastern Asian ones. > However, the recent molecular analyses of North American and eastern Asian > populations of *P*. *sagittatum* (Park, in prep.) show that these > disjunct populations are genetically somewhat divergent from each other. > The degree of genetic divergence, however, strongly suggests that they can > be recognized either as a single polymorphic species (*P*. *sagittatum* s.l.) > or two distinct varieties of *P*. *sagittatum*, but they can hardly be > treated as two distinct species. > > Regards, > Ritesh > > -- You received this message because you are subscribed to the Google Groups "efloraofindia" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. Visit this group at https://groups.google.com/group/indiantreepix. For more options, visit https://groups.google.com/d/optout.
