<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31468810</termId><termName>Populus tremuloides</termName><termType>PT</termType><termNote><![CDATA[ Species of tall, fast-growing tree native to cooler areas of North America. The name refers to the tendency of leaves to tremble or quake in even a slight breeze due to their flattened petioles. It is most easily distinguished from a similar European species, P. tremula, by the shape of its leaves, which have more pointed tips, and by growing via root suckers: it propagates itself primarily through root sprouts, and extensive clonal colonies are common. The leaves are food for various insects. A substance in the bark was extracted by Native Americans and the pioneers of the American West as a quinine substitute. The soft, weak wood is used as paper pulp and for other purposes. ]]></termNote><termCreatedDate>2026-03-30 21:06:13</termCreatedDate><relation><relationType>UF</relationType><termId>31468811</termId><termName>American aspen</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31468812</termId><termName>American poplar</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31468813</termId><termName>American quaking aspen</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31468814</termId><termName>quaking aspen</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31454978</termId><termName>Populus</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31468798</termId><termName>Populus tremula</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31470488</termId><termName>American aspen</termName><termType>PT</termType></relation></term>  </Zthes>