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.
