<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31467692</termId><termName>Betula nigra</termName><termType>PT</termType><termNote><![CDATA[ Species of ornamental tree found on riverbanks and swamps in the eastern one-third of the United States, growing 18-30 m (60 to 80 feet) in height. Because the lower trunk becomes very dark with age, the tree is sometimes called black birch. The red-brown, deeply furrowed bark on an old trunk breaks into ragged, closely appressed scales; the upper trunk and branches are smooth, salmon pink to rose cinnamon, with a metallic luster. ]]></termNote><termCreatedDate>2026-03-30 21:05:56</termCreatedDate><relation><relationType>UF</relationType><termId>31467693</termId><termName>black birch</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31467694</termId><termName>red birch</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31467695</termId><termName>river birch</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31467696</termId><termName>water birch</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31454693</termId><termName>Betula</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31470068</termId><termName>river birch</termName><termType>PT</termType></relation></term>  </Zthes>