Grindelia squarrosa
 
Gumweed

Whole Plant

Four km North of Craven on Highway # 20
10-August-2012

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Grindelia: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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plants NOT annuals

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plants NOT with a woody caudex

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plants NOT heavily scented

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plants NOT glandular-hairy

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juice watery; NOT [juice milky]

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plants with leafy stems; NOT [plants more or less scapose, cauline leaves none, or few and reduced to bracts]

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leaves alternate; NOT [leaves opposite, at least below]

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leaves NOT linear

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flowers heads more than 6 mm across

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involucral bracts in one or more series, all more or less the same; NOT [involucral bracts of 2 distinct, dissimilar series]

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involucre NOT glandular-glutinous (BF)

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involucre resinous (sticky and gummy) (BF)

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receptacle naked; NOT [receptacle chaffy or bristly]

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flower heads with both tubular and ray florets

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rays florets conspicuous; NOT [ray florets 1-6, inconspicuous]

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ray florets pistillate or neuter; NOT [ray florets perfect]

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rays erect or spreading; NOT [rays deflexed]

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rays more or less entire; NOT [rays distinctly 3-lobed]

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rays yellow

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stamens united to form a tube around the pistil

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pappus of 2-several, firm, caducous awns; NOT [pappus composed of hairs]