Citrus halimii
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| BCStone |
Citrus halimii is a species from the genus of citrus plants ( Citrus ). It grows as an evergreen tree in Southeast Asia , the first scientific description was given in 1973. The name honors the then King of Malaysia Sultan Abdul Halim Nuazzam Shah .
description
Citrus halimii reaches heights of 20 to 25 meters with a trunk diameter of up to 35 centimeters. In the closed forest the trunk is slim and straight, the crown is high on the trunk and consists of very few, upwardly directed branches. The bark is smooth and gray, inside yellow, the wood is whitish. Neither wood nor bark have an odor. Young twigs are green, thorns are only present in young plants.
The leaves become relatively large: 8 to 15 (20) centimeters long and 4 to 8 (9) centimeters wide. They are long-oval shaped, smooth and dark green on the top, lighter on the underside. There are numerous (50 per mm²) oil glands in the leaf blade. There is a separating tissue between the leaf blade and the petiole, the petiole is somewhat widened, more clearly widened in young plants.
The flowers sit individually in the leaf axils, they are very short stalked. The flower consists of five overgrown sepals , five free, white-colored petals , 18 to 20 stamens and the gynoeceum . The stamens are free or two or three fused together at the base. The ovary is composed of six to ten carpels with one to three ovules together.
The round fruits measure about 5 centimeters in diameter. The exterior is shiny, somewhat uneven, and colored yellow as it ripens. The exocarp is about 6 millimeters thick and adheres firmly to the white mesocarp . The segments are filled with yellow-green pulp. The seeds are numerous (12 to 18 per fruit) and quite large at 2 centimeters in length. They contain only one embryo, the cotyledons are white.
distribution
Citrus halimii is a rare species. When it was first described in 1973, only about ten sites were known that came from Thailand and Malaysia . Borneo locations are now also known. The species grows there at altitudes of 900 to 1800 meters in undisturbed forests. Most of the locations are on granite rock , less often on limestone .
supporting documents
- BC Stone, JB Lowry, RW Scora, K. Jong: Citrus halimii: A New Species from Malaya and Peninsular Thailand . In: Biotropica . Vol. 5 No. 2, 1973, pp. 102-110.
- Citrus halimii as "Plant of the month" of the Thai "Office of the Forest Herbarium"