Houstonia longifolia
 
Long-Leaved Bluets

Leaf Pair Top

Hudson Bay Regional Park
26-June-2018

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Houstonia: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
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low plants

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leaves opposite, in pairs; NOT [leaves apparently whorled, the stipules resembling the leaves]

 

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Rubiaceae: 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 without milky juice

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not climbing plants with tendrils

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leaves opposite; NOT [leaves basal or alternate]

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leaves with stipules, sometimes appearing whorled; NOT [leaves without stipules]

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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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flowers with two floral rings

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petals wholly or partly united forming a tube or bell

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stamens 4 or 5; NOT [stamens 3]

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ovary inferior; NOT [ovary superior]