Penstemon albidus
 
White Beardtongue

Flower Bottom

Oro Lake Regional Park
25-June-2011

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Albidus: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
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plants herbaceous; NOT [plants shrubby, stem woody]

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stems erect or nearly so; NOT [stems decumbent to ascending]

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flowers not so crowded; NOT [flowers in dense terminal spikes or nodal clusters]

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inflorescence glandular

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flowers 15-25 mm long; NOT [flowers 8-12 mm long]; NOT [flowers 30-40 mm long]

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corolla broadly funnelform

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corolla white, finely purplish lined or spotted; NOT [corolla blue, purplish, or lilac]

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style not yellow-pilose; NOT [style yellowish, long-pilose]

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style included; NOT [style exserted]

 

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Penstemon: Answers to key questions in Budd's Flora  and Flora of Alberta leading to this genus. 
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leaves NOT all basal

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cauline leaves opposite; NOT [cauline leaves alternate]

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calyx 5-lobed; NOT [calyx 4-lobed]

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corolla NOT spurred at the base

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four anther-bearing stamens and one long sterile stamen (staminode); NOT [two or four anther-bearing stamens and no sterile stamen], NOT [five anther-bearing stamens]

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staminode present, filamentous; NOT [staminode absent or scale-like]

 

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Scrophulariaceae: Answers to key questions in Budd's Flora  leading to this family. 
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herbs; NOT [shrubs or trees]

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plants green or with some chlorophyll; NOT [plants parasitic or saprophytic, without chlorophyll]

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plants NOT aquatic

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stems NOT square

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leaves NOT bearing bladders

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flowers NOT in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head]

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corolla irregular; NOT [corolla regular]

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ovary superior; NOT [ovary inferior]

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fruit a many-seeded capsule; NOT [fruit with 4 nutlets]