Within the Populus szechuanica article...

var. tibetica Schneid

This variety is founded on specimens of uncertain attribution collected in the N.W. Himalaya by Thomson and by Schlagintweit. Schneider considered that they represented a pubescent form of P. szechuanica and under this variety he also placed Wilson’s 4527, collected in Szechwan. If Schneider is right, the Westonbirt and Stourhead trees would be referable to var. tibetica, but further investigation may show that the balsam poplar of the N.W. Himalaya is specifically distinct from P. szechuanica.


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