
1) Balsam poplar 2) Poplar 3) Poplar tree 4) Populus balsamifera 5) Tacamahac
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https://www.crosswordclues.com/clue/hackmatack

1) Larch 2) Tacamahac
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https://www.crosswordclues.com/clue/hackmatack

• (n.) The American larch (Larix Americana), a coniferous tree with slender deciduous leaves; also, its heavy, close-grained timber. Called also tamarack.
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http://thinkexist.com/dictionary/meaning/hackmatack/

(Larix) Larix, also known as the Larch, Tamarack or Hackmatack, is a coniferous (cone-bearing) tree, which lose their needles in autumn. The Larches grow in northern regions, or at high altitudes in the mountainous parts of temperate countries. They are found throughout central Europe, the Himalayas, China, Korea, Japan, Siberia and North America. ...
Found on
http://www.encyclo.co.uk/local/10004
Hack'ma·tack` (-mȧ*tăk`)
noun [ Of American Indian origin.]
(Botany) The American larch (
Larix Americana ), a coniferous tree with slender deciduous leaves; also, its heavy, close-grained timber. Called also
tamarack .
Found on
http://www.encyclo.co.uk/webster/H/2
No exact match found.