Rhododendron crassifolium
Flowers in Kinabalu Botanical Garden, Sabah
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Ericales
Family:	Ericaceae
Genus:	Rhododendron
Subgenus:	Rhododendron subg. Vireya
Section:	Rhododendron sect. Schistanthe
Species:	R. crassifolium
Binomial name
Rhododendron crassifolium Stapf[1]

Rhododendron crassifolium is a species of tropical rhododendron, a perennial flowering plant belonging to the family Ericaceae.^[1] It is placed in section Schistanthe.^[2]

Rhododendron crassifolium is a tropical rhododendron native to mountainside forests of Borneo at 1,200–2,200 m (3,900–7,200 ft). It is a medium size evergreen shrub about 90–120 cm (35–47 in) tall. Leaves are dark green, broad, ribbed and elliptic. The bell-shaped flowers are red-orange. The flowering period extends from June through August.^{[citation needed]}

As of February 2024, Plants of the World Online accepted two species:^[1]

• Rhododendron crassifolium var. crassifolium, synonyms Rhododendron brevitubum, Rhododendron crassinervium
• Rhododendron crassifolium var. pseudomurudense (Sleumer) Argent, synonyms Rhododendron murudense, Rhododendron pseudomurudense

The species is native to the island of Borneo.^[1]

This species is typical of the shaded mountain forests. It prefers acidic, well-drained, organic soil in partial sun to partial shade.^{[citation needed]}

• George Argent, Anthony Lamb and Anthea Phillipps - The Rhododendrons of Sabah, Malaysian Borneo - Scientific Editor: Wong Khoon Meng
• Biolib

• Media related to Rhododendron crassifolium at Wikimedia Commons
• Dixpix
• Rogerstree