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1,791 species in Theodore Roosevelt National Park
Andrena erythrogaster
Andrena imitatrix
Andrena mariae
Androsace occidentalis
Androsace septentrionalis
Antennaria dimorpha
Antennaria rosea
Antheraea polyphemus
Apamea inordinata
Apantesis carlotta
Aphyllon ludovicianum
Aquarius remigis
Araneus trifolium
Arctium lappa
Arcyria cinerea
Argynnis cybele
Arnica fulgens
Asagena americana
Asclepias pumila
Ascochyta utahensis
Asteromyia carbonifera
Astragalus canadensis
Astragalus ceramicus
Astragalus lotiflorus
Atriplex dioica
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