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Orthothecium acuminatum

Orobanche corymbosa subsp. corymbosa

Orthotrichum macounii

Ornithogalum nutans

Drooping star-of-bethlehem

Ornithogalum thyrsoides

Christmas-lily

Ornithopus pinnatus

Slender serradella

Ornithostaphylos oppositifolia

Baja california birdbush

Orobanche cernua

Australian broomrape

Orobanche crenata

Bean broomrape

Orobanche multicaulis var. genuina

Orobanche uniflora var. sedii

Orthocarpus purpureoalbus

Orthocarpus tolmiei subsp. tolmiei

Plagiobothrys pringlei

Orthothecium chryseum var. cochlearifolium

Orthothecium intricatum

Orthothecium rubellum

Orthotrichum alpestre var. majus

Orthotrichum alpestre var. occidentale

Orthotrichum alpestre var. watsonii