- Bazzania ambigua, Mastigobryum ambiguum
- Chenopodium glaucum, Glaucous Goosefoot;Pale Goosefoot;Chenopodium ambiguum RBr;Chenopodium ambiguum var majus Moq;Chenopodium ambiguum var minus Moq;Chenopodium littorale Moq;Chenopodium ambiguum RBr var ambiguum;Oak-leaved Goosefoot;Oakleaf goosefoot
- Cleome guianensis, Physostemon guyanense;Physostemon guianense;Physostemon ambiguum;Physostemon intermedium
- Colobostylus interruptus, Cyclostoma ambiguum
- Leiocarpa semicalva, Helichrysum semicalvum FMuell;Leptorhynchos ambiguus var semicalvus FMuell Benth;Leptorhynchus ambiguus var semicalvus orth var Benth sensu Bentham, G 1867;Chrysocephalum semicalvum FMuell Paul GWilson;Helichrysum ambiguum Turcz;Helichrysum ambiguum Turcz subsp ambiguum;Helichrysum ambiguum Turcz var ambiguum;Leptorhynchos ambiguus Turcz Benth;Chrysocephalum ambiguum Turcz Anderb
- Marsupella brevissima, Acolea brevissima;Acolea cochlearis;Acolea conferta;Acolea crassifolia;Acolea varians;Cesia cochlearis;Cesia conferta;Cesia crassifolia;Cesia varians var cochlearis;Cesia varians var crassifolia;Cesia varians;Gymnomitrion ambiguum;Gymnomitrion brevissimum;Gymnomitrion cochleare;Gymnomitrion confertum;Gymnomitrion crassifolium;Gymnomitrion varians;Marsupella cochlearis;Marsupella conferta;Marsupella varians var crassifolia;Marsupella varians;Nardia brevissima;Nardia cochlearis;Nardia varians;Sarcocyphos confertus;Sarcoscyphus confertus
- Parmeliopsis ambigua, Foraminella ambigua;Lichen ambiguus;Lobaria ambigua;Parmelia ambigua;Parmelia viridosoredians;Placodium ambiguum;Squamaria ambigua
- Rhizocarpon distinctum, Rhizocarpon ambiguum;Buellia distincta;Diplotomma distinctum;Lecidea distincta;Lecidea obscurata f orphnina;Lecidea petraea var ambigua;Rhizocarpon obscuratum subsp orphninum;Rhizocarpon orphninum
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