Wendlandiella gracilis

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Wendlandiella gracilis
Systematics
Monocots
Commelinids
Order : Palm- like arecales
Family : Palm family (Arecaceae)
Genre : Wendlandiella
Type : Wendlandiella gracilis
Scientific name of the  genus
Wendlandiella
Dammer
Scientific name of the  species
Wendlandiella gracilis
Dammer

Wendlandiella gracilis is a South American species of palm . It is the only species in the genus Wendlandiella and named after the German botanist and palm tree specialist Hermann Wendland (1825–1903).

features

Wendlandiella gracilis is a small, pinnate-leaved palm of the understory. It is dwarfed, clump-forming, unarmed, blooming several times and diocesan . The trunk is very slender with long internodes and ring-shaped leaf scars.

The chromosome number is 2n = 28.

leaves

The leaves are pinnate or whole, then bifid and with pinnate nerves. The leaf sheaths are slender, tubular and not tearing open. The petiole is slender. The rachis is approximately triangular in cross section. The leaflets, if any, count only 24 per side. They have broad attachment points, are thin, smooth and lanceolate. The midrib and part of another pair of nerves are larger.

Inflorescences

The inflorescences are between the leaves (interfoliar). Male and female inflorescences are similar to each other. They are simple, rarely double branched. The inflorescence stalk is long. The cover sheet is tubular. There is a bract on the peduncle, this is tubular. The inflorescence axis is shorter than the stalk. The flower-bearing axes (rachillae) are slender. There are few, which are then arranged almost like fingers, up to many. They have small, membranous bracts. There are no flower bracts.

blossoms

The male flowers are in coils of two to six flowers. The three sepals are briefly fused and have a distinct hump at the base. Distally they are free and the tips form a hood, at least in the bud. The edges of the sepals are usually thin. The three petals are thin, without nerves when dry, valvate . When they are in bloom, they are spread out or pushed back. There are six stamens . Their filaments are erect in the bud state. They are not grown together. The anthers are medium in size with rounded ends. The connective are meaty and very short. The three rudiments of the stamp are freely or briefly fused. The pollen is ellipsoidal and slightly asymmetrical. The germ opening is a distal sulcus.

The female flowers are solitary or in vertical pairs. The three sepals are fused to form a flat, three-lobed cup with humps at the base. The three petals are imbricat , humped and about twice as long as the sepals. There are three very small staminodes . The gynoeceum is approximately spherical, triple with an ovule and has three scars .

Fruits and seeds

The fruit is ellipsoidal with basal remnants of scarring and remnants of the abortive carpels . When ripe, the fruit is orange-red. The exocarp is smooth, the mesocarp thin and free of fibers. The endocarp is membranous and not attached to the semen. The seed bears a single rape branch that stretches across the tip and a side branch that runs across each of the two side surfaces. The endosperm is homogeneous. The embryo sits on the side a little below the middle.

Distribution and locations

The species occurs in the western Amazon basin . The area is located in the states of Peru , Brazil and Bolivia . There are three varieties, each of which occurs in its own area. They grow in the undergrowth of the lowland rainforest on terra firme .

Systematics

The genus Wendlandiella is placed within the family Arecaceae in the subfamily Arecoideae , tribe Chamaedoreeae . The kinship relationships of Wendlandiella within the tribe are not clear.

In the World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew, only the species Wendlandiella gracilis is recognized, which is divided into three varieties:

  • Wendlandiella gracilis var. Gracilis : It occurs from the Brazilian state of Acre to northern Peru.
  • Wendlandiella gracilis var. Polyclada (Burret) AJHend. : It occurs only in northern Peru.
  • Wendlandiella gracilis var. Simplicifrons (Burret) AJHend. : It occurs from Peru to Bolivia.

literature

  • John Dransfield, Natalie W. Uhl, Conny B. Asmussen, William J. Baker, Madeline M. Harley, Carl E. Lewis: Genera Palmarum. The Evolution and Classification of Palms . Second edition, Royal Botanic Gardens, Kew 2008, ISBN 978-1-84246-182-2 , pp. 372-375.

Individual evidence

  1. ↑ Lotte Burkhardt: Directory of eponymous plant names . Extended Edition. Botanic Garden and Botanical Museum Berlin, Free University Berlin Berlin 2018. [1]
  2. ↑ a b c d Rafaël Govaerts (Ed.): Wendlandiella. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved August 4, 2018.

Web links