
1) Plant common name 2) Plant with a bitter root 3) Poisonous plant
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https://www.crosswordclues.com/clue/dogbane

1) Rauwolfia
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https://www.crosswordclues.com/clue/dogbane

• (n.) A small genus of perennial herbaceous plants, with poisonous milky juice, bearing slender pods pods in pairs.
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http://thinkexist.com/dictionary/meaning/dogbane/

(from the article `Gentianales`) Latex tubes in the stems of the dogbane family, Apocynaceae, produce a milky juice (a feature shared with the milkweed family, Asclepiadaceae). Up to ... ...coronaria). Several species of the genera Trachelospermum (especially star jasmine, T. jasminoides), Mandevilla, and Allamanda are attractive ... ...
Found on
http://www.britannica.com/eb/a-z/d/62
Dog'bane` noun [ Said to be poisonous to dogs. Confer
Apocynaceous .]
(Botany) A small genus of perennial herbaceous plants, with poisonous milky juice, bearing slender pods pods in pairs.
Found on
http://www.encyclo.co.uk/webster/D/106

[
n] - any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root
Found on
http://www.webdictionary.co.uk/definition.php?query=dogbane
noun any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root
Found on
https://www.encyclo.co.uk/local/20974

any of several plants of the genus Apocynum, esp. A. androsaemifolium, yielding an acrid milky juice and having an intensely bitter root.
Found on
https://www.infoplease.com/dictionary/dogbane
No exact match found.