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| Kingdom Plantae |
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Betula X utahensis Britton (pro sp.) – accepted – northwestern paper birch
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Helianthus X kellermanii Britton (pro sp.) – accepted – Kellerman's sunflower
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Hieracium X alleghaniense Britton (pro sp.) – accepted – Allegheny hawkweed
|
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Opuntia X lucayana Britton (pro sp.) – accepted
|
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Quercus X rudkinii Britton (pro sp.) – accepted – Rudkin's oak
|
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Scirpus X peckii Britton (pro sp.) – accepted – Peck's bulrush |
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