Agave brittoniana
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Agave brittoniana is a species ofthe agave ( agave ) genus . The specific epithet brittoniana honors the American botanist Nathaniel Lord Britton .
description
Vegetative characteristics
Agave brittoniana grows with non- rhizomatous stems. Their green and sometimes grayish, slightly shiny, broadly lanceolate leaves taper abruptly towards the tip. The leaf blade is 80 to 100 centimeters (rarely 70 to 110 centimeters) long and 15 to 20 centimeters (rarely 13 to 24 centimeters) wide. The leaf margin is often concave. On it are 1 to 6 millimeters (rarely up to 8 millimeters) long peripheral teeth that are 8 to 10 millimeters (rarely 6 to 15 millimeters) apart. The slender-pointed, differently curved marginal teeth arise from a lenticular or stronger base, which can stand on curved, green protrusions in the lower third of the leaves. The brown, white dotted, smooth, somewhat polished terminal mandrel is curved in a claw shape, almost conical or strongly thickened on its underside. Its edges are drawn inwards and it is furrowed open to the middle. The end pin is 10 to 25 millimeters long and somewhat sloping.
Inflorescences and flowers
The "panicle" inflorescence reaches a length of 5 to 8 meters (rarely only 4 meters). The inflorescence stem is very short or almost absent. The ascending partial inflorescences are 15 to 30 centimeters (rarely up to 11 centimeters) long. The flowers are 25 to 35 millimeters (rarely up to 45 millimeters) long and are on 5 to 10 millimeter long peduncles . Their tepals are yellow, their outside is greenish. The tips are 9 to 14 millimeters (rarely up to 16 millimeters) long and 3 to 5 millimeters wide. The open flower tube has a length of 3 to 6 millimeters. The spindle-shaped ovary is 15 to 20 millimeters (rarely up to 25 millimeters) long.
fruit
The elongated, sometimes almost cylindrical fruits are 2.3 to 4 centimeters (rarely up to 4.5 centimeters) long and 1.1 to 1.5 centimeters (rarely up to 1.7 centimeters) wide. They are strongly stalked at their base and slightly beaked at their tip.
Systematics and distribution
Agave brittoniana is common in central Cuba .
The first description by William Trelease was published in 1913. The following subspecies are distinguished:
- Agave brittoniana subsp. brittoniana
- Agave brittoniana subsp. brachypus (Trel.) A.Álvarez
- Agave brittoniana subsp. sancti-spirituensis A.Álvarez
Agave brittoniana subsp. brachypus
The differences to Agave brittoniana subsp. brittoniana are: The tip of the leaf is runny and usually has small teeth on the inner edges. The inflorescence is somewhat looser and the flowers smaller. The fruits are more cylindrical.
The first description as Agave brittoniana var. Brachypus by William Trelease was published in 1913. Alberto Álvarez de Zayas raised the variety to a subspecies in 1996.
Agave brittoniana subsp. sancti-spirituensis
In contrast to Agave brittoniana subsp. brittoniana , the leaves are much smaller, more elongated and less lanceolate. The flowers as well as the tepals and the anthers are larger.
The first description of Agave brittoniana subsp. sancti-spirituensis took place in 1996 by Alberto Álvarez de Zayas.
proof
literature
- Urs Eggli (ed.): Succulent lexicon. Monocotyledons . Eugen Ulmer, Stuttgart 2001, ISBN 3-8001-3662-7 , pp. 17-18 .
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Springer, Berlin / Heidelberg 2010, ISBN 978-3-642-05597-3 , p. 32.
- ^ William Trelease: Agave in the West Indies . In: Memoirs of the National Academy of Sciences . Volume 11, 1913, pp. 44-45, plates 98-99 ( online ).
- ^ William Trelease: Agave in the West Indies . In: Memoirs of the National Academy of Sciences . Volume 11, 1913, p. 45, panel B, fig. 14 and panel 99, fig. 1 ( online ).
- ^ Alberto Álvarez de Zayas: Los agaves de Cuba central . In: Fontqueria . Volume 44, 1996, p. 121.
- ^ Alberto Álvarez de Zayas: Los agaves de Cuba central . In: Fontqueria . Volume 44, 1996, p. 125.
further reading
- José Orestes Guerra, Alfredo Meneses, Ana María Simonet, Francisco Antonio Macías, Clara Nogueiras, Alicia Gómez, José A. Escario: Saponinas esteroidales de la planta Agave brittoniana (Agavaceae) con actividad contra el parásito Trichomona vaginalis . In: Revista de Biologa Tropical . Volume 56, Number 4, 2008, pp. 1645-1652 ( online ).
- Graziela M. Silva, Aloa M. De Souza, Luciene S. Lara, Tatiana P. Mendes, Bernadete P. da Silva, Anibal G. Lopes, Celso Caruso-Neves, José P. Parente: A New Steroidal Saponin from Agave brittoniana and Its Biphasic Effect on the Na + -ATPase Activity. In: Journal of Nature Research C . 60, 2005, pp. 121–127 ( PDF , free full text).