Arnica chamissonis
 
Leafy Arnica

Flower Head in Ground

Duck Mountain Provincial Park
26-July-2009

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Chamissonis: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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stem leaves numerous, in 4-8 pairs; NOT [stem leaves less numerous, in 1-3 pairs] (BF)

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cauline leaves mostly 5-10 pairs; NOT [cauline leaves mostly 2-4 pairs, not including those (in any) of the basal cluster] (FOA)

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leaves oblong-lanceolate to linear; NOT [leaves cordate to oblong]

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lower stem leaves lanceolate; NOT [lower stem leaves ovate or deltoid]

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lower stem leaves entire to remotely dentate; NOT [lower stem leaves sharply dentate]

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heads several to many; NOT [heads solitary or few]

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involucral bracts obtuse or merely acutish; NOT [involucral bracts definitely acute]

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involucral bracts bearing a tuft of long hairs at or just within the tip; NOT [tips of involucral bracts not markedly more hairy than the body]

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pappus straw-coloured or brownish; NOT [pappus often white]

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pappus barbellate; NOT [pappus often subplumose]

 

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Arnica: Answers to key questions in Budd's Flora  and Flora of Alberta leading to this genus. 
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juice watery; NOT [juice milky]

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leaves opposite; NOT [leaves alternate or basal]

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involucral bracts usually one series, not or scarcely imbricated; NOT [involucral bracts in 2 or more series, well imbricated] (BF)

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receptacle naked (FOA)

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flower heads with florets both tubular and ray

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ligulate flowers when present pistillate or neuter; NOT [flowers all perfect]

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ray florets yellow; NOT [rays white, to pink, purple or blue]

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stamens united to form a tube around the pistil

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pappus composed of hairs; NOT [pappus chaffy, or of firm awns, or of bristles, or of scales, or a crown or none]