
1) Crocanthemum canadensei 2) Frost-weed 3) Frostwort 4) Helianthemum 5) Sun rose 6) Sunrose
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https://www.crosswordclues.com/clue/frostweed

1) Frostwort
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https://www.crosswordclues.com/clue/frostweed

• (n.) An American species of rockrose (Helianthemum Canadense), sometimes used in medicine as an astringent or aromatic tonic.
Found on
http://thinkexist.com/dictionary/meaning/frostweed/

<botany> An American species of rockrose (Helianthemum Canadense), sometimes used in medicine as an astringent or aromatic tonic. ... It has large yellow flowers which are often sterile, and later it has abundant but inconspicuous flowers which bear seed. It is so called because, late in autumn, crystals of ice shoot from the cracked bark at ...
Found on
http://www.encyclo.co.uk/local/20973
Frost'weed` noun (Botany) An American species of rockrose (
Helianthemum Canadense ), sometimes used in medicine as an astringent or aromatic tonic. » It has large yellow flowers which are often sterile, and later it has abundant but inconspicuous flowers which bear seed. It is so call...
Found on
http://www.encyclo.co.uk/webster/F/80

[
n] - perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers
Found on
http://www.webdictionary.co.uk/definition.php?query=frostweed

a plant, Helianthemum canadense, of the rockrose family, native to eastern North America, having narrow leaves and a solitary yellow flower.
Found on
https://www.infoplease.com/dictionary/frostweed
No exact match found.