Balmea is a monospecific genus of flowering plants in the family Rubiaceae containing the single species Balmea stormiae. It is native to El Salvador, Guatemala and Mexico (Nayarit, Jalisco, Colima, Guerrero, Michoacán, Chiapas). It is locally known as ayuque. It is conical in shape and used as a Christmas tree in parts of Mexico. Because populations are depleted by this overharvest, this species is threatened with extinction.
The plant is a shrub of four to seven meters. The smooth, greenish purple bark peels off in irregular thin shreds. The hard wood is whitish. The broadly ovate and shortly acuminate leaves are clustered at the end of the branches. The shrub flowers from August to October and the hermaphroditic flowers are scarlet-red, tinged with purple. When fully open they turn dark purple and at night a sweet scent emanates from them. The fruits ripen from December to January and are erect capsules, about 25 mm long that open at the tip in two follicle-like portions. The numerous seed show reticulate wings of about 4 mm.
- Davidse, G., M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera. 2012. Rubiaceae a Verbenaceae. 4(2): i–xvi, 1–533. In G. Davidse, M. Sousa Sánchez, S. Knapp & F. Chiang Cabrera (eds.) Flora Mesoamericana Missouri Botanical Garden Press, St. Louis.
- Fosberg, F. R. (1974). Studies in American Rubiaceae 2. Ayuque, Balmea stormae, an endangered Mexican species. Sida: Contributions to Botany, 268-270.
- Martinez M (1942). "A new genus of Rubiaceae from Mexico". Bulletin of the Torrey Botanical Club. 69 (6): 438–441. doi:10.2307/2481425. JSTOR 2481425.