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Ricinus communis

Palma-christi

Robinia hispida

Moss locust

Robinia neomexicana var. neomexicana

New mexico locust

Robinia viscosa

Clammy locust

Rigiopappus leptocladus

Richardia tricocca

Jurinea stoechadifolia

Rochefortia spinosa

Espino

Roldana petasitis

California geranium

Romanzoffia californica

California mistmaiden

Romanzoffia tracyi

Tracy's mistmaiden

Romneya trichocalyx

Hairy matilija-poppy

Romulea rosea

Plum-puddings

Rorippa amphibia

Great yellow cress

Descurainia gonzalezi

Rorippa austriaca

Roldana hartwegii

Millettia ferruginea subsp. ferruginea

Saussurea fauriei

Hieracium bohatschianum