เรื่อง ทะเบียนพันธุพืชในประเทศไทย

Ravenia sp. Rutaceae
Reediella humilis (Forst.f.) Pich-Ser. Hymenophyllaceae
Reevesia siamensis Craib Sterculiaceae
Reevesia sp. Sterculiaceae
Reinwardtia cicanoba (Buch.-Ham. ex D.Don) Hara Linaceae
Reinwardtia sinensis Hemsl. Linaceae
Reinwardtia sp. Linaceae
Reinwardtia trigyna (Roxb.) Planch. Linaceae
Reissantia vivipara (Lodd.) Schott Celastraceae
Remusatia sarmentosus Klotzsch Araceae
Remusatia sp. Araceae
Renanthera sp. Orchidaceae
Rennellia sp. Rubiaceae
Rhaidophra crenatus Zieb. & Zucc. Rhamnaceae
Rhaidophra glauca (Wall.) Schott Rhamnaceae
Rhaidophra hookeri Schott Rhamnaceae
Rhaidophra peepla (Roxb.) Schott Rhamnaceae
Rhamnus cambodianus Rhamnaceae
Rhamnus nipalensis (Wall.) Laws. Rhamnaceae
Rhamnus sp. Rhamnaceae
Rhaphidophora aurea (Linden & Andre) Birdsey Araceae
Rhaphidophora kerrii Gagnep. Araceae
Rhaphidophora pinnata Schott Araceae
Rhaphidophora sp. Araceae
Rhaphiolepis fragrans Geddes Rosaceae
Rhaphiolepis sp. Rosaceae
Rhapis humilis Blume Arecaceae
Rhapis sp. Arecaceae
Rhektophyllum sp. Araceae
Rhinacanthus communis Nees Acanthaceae
Rhinacanthus sp. Acanthaceae
Rhizanthes sp. Rafflesiaceae
Rhizophora candelaria DC. Rhizophoraceae