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4,118 species in Yellowstone National Park
Agoseris grandiflora
Agoseris parviflora
Agraylea saltesea
Agrocybe pediades
Agrocybe praecox
Agrostis mertensii
Agyneta flibuscrocus
Albatrellopsis confluens
Albatrellus ovinus
Aleuria aurantia
Alisma triviale
Allium bisceptrum
Allonemobius fasciatus
Alloperla medveda
Allotropa virgata
Alopecurus arundinaceus
Alopecurus geniculatus
Alopecurus magellanicus
Alypia ridingsii
Alyssum turkestanicum
Amanita porphyria
Amara aenea
Amara erratica
Amblyodon dealbatus
Amelanchier utahensis
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