
1) Baneberry 2) Herb christopher 3) Poisonous plant
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https://www.crosswordclues.com/clue/cohosh

1) Snakeberry
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https://www.crosswordclues.com/clue/cohosh

• (n.) A perennial American herb (Caulophyllum thalictroides), whose rootstock is used in medicine; -- also called pappoose root. The name is sometimes also given to the Cimicifuga racemosa, and to two species of Actaea, plants of the Crowfoot family.
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http://thinkexist.com/dictionary/meaning/cohosh/

(from the article `baneberry`) The white baneberry (A. pachypoda; sometimes A. alba), which is native to North America, is 30 to 45 cm (12 to 18 inches) tall and bears white ...
Found on
http://www.britannica.com/eb/a-z/c/106
Co'hosh noun (Botany) A perennial American herb (
Caulophyllum thalictroides ), whose rootstock is used in medicine; -- also called
pappoose root . The name is sometimes also given to the
Cimicifuga racemosa , and to two species of
Actæa , plants of the Crowfoot famil...
Found on
http://www.encyclo.co.uk/webster/C/106
herb Christopher noun a plant of the genus Actaea having acrid poisonous berries
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https://www.encyclo.co.uk/local/20974

either of two unrelated plants of the eastern U.S., Cimicifuga racemosaof the buttercup family, or Caulophyllum thalictroidesof the barberry family, both used medicinally.
Found on
https://www.infoplease.com/dictionary/cohosh
No exact match found.