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19b. Polygonum rottboellioides var. tibetica (Hook. f.) R. R. Stewart, Ann. Cat. Vasc. Pl. Pak. & Kashm. 210. 1972; Munshi &Javeid, l.c. 58. (Fig.9, F-I).
Polygonum tubulosum Boiss. var. tibetica Hook. f., Fl. Brit. Ind. 5: 27. 1886.
Fl. Per.: June-September.
Syntypes: Western Tibet; Karakorum, alt. 12000 ft. Clarke (K!); Lahul, Jaeschke (K); Chamba, Ellis (K).
Grows between 1500-4500 m; Distribution: Pakistan, Kashmir, India and Xizang.
Polygonum rottboellioides var. tibetica is more common in our area than the type variety; quite close to P. polycnemoides but plants are glabrous and the perianth tube is smaller in the latter taxon.
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