White mangrove

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White mangrove
White Mangrove (Laguncularia racemosa)

White Mangrove ( Laguncularia racemosa )

Systematics
Eurosiden II
Order : Myrtle-like (Myrtales)
Family : Winged family (Combretaceae)
Subfamily : Combretoideae
Genre : Laguncularia
Type : White mangrove
Scientific name of the  genus
Laguncularia
CFGaertn.
Scientific name of the  species
Laguncularia racemosa
( L. ) CFGaertn.

The white mangrove ( Laguncularia racemosa ) is the only species of the Laguncularia plant genus within the winged family (Combretaceae). Laguncularia racemosa grows as a mangrove tree in coastal areas of the tropics and subtropics of West Africa , North and South America . The common name "white mangrove" is also used for a species of the genus Avicennia .

description

Appearance and leaf

Laguncularia racemosa grows as a tree or shrub . Younger plants have a smooth bark , older plants have a cracked bark . The root system occasionally forms pneumatophores (respiratory roots that grow vertically upwards).

The opposite arranged leaves are divided into a petiole and a leaf blade. The petiole has a pair of glands; the glands secrete a nectar-like substance. Further, microscopic (salt -?) Glands are found on the leaf blade. The simple, elliptical, entire leaf blade has a rounded or edged upper end; in the bud position it is rolled inwards. Stomata are on both sides of the leaf blade.

Inflorescence with flowers in different stages of development

Inflorescence, flower and fruit

The flowers are mostly hermaphroditic , occasionally there are purely male flowers in the inflorescences. Sometimes Laguncularia racemosa is andromonözisch , rarely dioeciously separated ( dioecious ). The annual inflorescences are terminal or lateral. The relatively small, hermaphroditic or unisexual flowers are radial symmetry and five-fold with a double flower envelope . The flowers are each over two bracts , which are slightly overgrown below the cup-shaped flower cup (hypanthium). There is only a short piece of the flower cup above the overgrown bracts. The male flowers are about 2 millimeters and female and hermaphrodite flowers are up to 6.5 millimeters high. There are five sepals . The five petals are short. The ten stamens are at most as long as the corolla. Staminodes are present in female flowers . The ovary contains two ovules . The stylus is short.

The fruit has a length of 12 to 20 millimeters and a diameter of 4 to 10 millimeters. The lonely fruit germinates soon after it is shed.

Systematics

It was first published in 1759 under the name ( Basionym ) Conocarpus racemosus by Carl von Linné in Systema Naturae , Editio Decima, 2, p. 930. The new combination to Laguncularia racemosa (L.) CFGaertn. was published in 1807 by Carl Friedrich von Gaertner in Supplementum Carpologiae , p. 209, plate 217, fig. 3 published and the genus Laguncularia C.F.Gaertn. set up. Other synonyms for Laguncularia racemosa (L.) CFGaertn. are: Laguncularia obovata Miq. , Rhizaeris alba Raf. , Schousboea commutata Spreng.

Laguncularia racemosa is the only species and type species of the genus Laguncularia from the tribe Laguncularieae in the subfamily Combretoideae within the family Combretaceae . Some authors also write of a second kind.

swell

  • Laguncularia at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed January 15, 2014.

literature

  • PB Tomlinson: The Botany of Mangroves , Cambridge University Press, Cambridge 1986, 419 pages. ISBN 0-521-46675-X

Individual evidence

  1. ↑ a b c d e f g PB Tomlinson: The Botany of Mangroves , Cambridge University Press, Cambridge 1986, 419 pages. ISBN 0-521-46675-X
  2. ↑ a b c d e f g Laguncularia at Tropicos.org. In: Flora Mesoamericana . Missouri Botanical Garden, St. Louis, accessed January 15, 2014.
  3. ↑ First publication scanned at botanicus.org .
  4. ^ A b Laguncularia racemosa in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved January 14, 2014.
  5. ↑ Laguncularia racemosa at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed January 14, 2014.
  6. ^ Laguncularia at Tropicos.org. In: Flora of Panama (WFO) . Missouri Botanical Garden, St. Louis, accessed January 15, 2014.

Web links

Commons : White Mangrove ( Laguncularia racemosa )  - Collection of images, videos and audio files