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Sphaerocoryne lefevrei, known in Khmer as rumduol (រំដួល ) and in Thai as lamduan (ลำดวน), is a flowering plant of the Annonaceae family, native to Southeast Asia. It is commonly cultivated as an ornamental plant, and is the national flower of Cambodia and the provincial flower of Thailand's Sisaket province. Some sources treat it as the same species as the similar S. affinis.
The species occurs naturally in mixed deciduous forests at elevations of . It is distributed in Thailand's northeast, central and eastern regions, as well as in Laos, Cambodia and Vietnam.
Some sources treat S. lefevrei as the same species as the similar S. affinis, a climbing species distributed in maritime Southeast Asia. In Cambodia, the rumduol has been referred to by the scientific name Mitrella mesnyi, which most authorities report as an illegitimate synonym of S. affinis. However, this species' range does not cover Cambodia.
The rumduol/lamduan's distinctive flowers are commonly evoked as a symbol, and have long been used as a metaphor for women's beauty in Khmer and Thai literature. The traditional Thai snack klip lamduan is a shortbread cookie made in the shape of the flower.
The rumduol was declared the national flower of Cambodia in 2005.
The lamduan flower also features as an important symbol in the Thai province of Sisaket province, as ancient inscriptions attribute the name Dong Lamduan ('lamduan forest') to the surrounding area on the Thai–Cambodian border, a region exhibiting significant Northern Khmer heritage. It is regarded as the provincial tree, the provincial flower, and is featured on the provincial seal and in its official slogan.
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