Alfaroa williamsii

Alfaroa williamsii is a Central American tree species from the family of the walnut family ( Juglandaceae ). The species is named after the American botanist Louis Otho Williams.

Features

Alfaroa williamsii is a 15 to 25 m tall with a trunk diameter of 30 to 50 cm. The bark is smooth or aged wrinkled. It dissolves easily from the stem in small, thin leaves. It is cream colored greenish yellow or light. The branches are cylindrical, glabrous, usually striped or warty and have numerous brown, elliptical to circular lenticels.

The leaves are almost opposite or alternate, are 15 to 25 cm long, and pinnate with 3-5 pairs Fiederpaaren. The leaflets are elliptic to elliptic - verkehrtlanzettlich, acute to acuminate at the end and oblique at the base. You have 14 to 20 pairs of lateral nerves and are bare at the bottom. The leaflets 4 to 13,5 cm long and 1.5 to 3.5 cm wide with a 1.4 to 4.5 cm long petiole. The leaves are short-stalked.

The male inflorescences are terminal or axillary. There are many-flowered panicles of several upright kitten. The female inflorescence is a terminal or lateral standing wenigblütige ear.

Male flowers are sessile, glandular, have a three-lobed, 3-4 mm long cover sheet with 0.5 mm long lateral lobes and a 1 -mm-long middle lobe. The two sepals are oblong or obovate and about 1 mm long. There are 7-9 stamens with two seated, oblong, 1 to 1.5 mm long anthers. The female flowers are sessile, 5-7 mm in size, with four sepals. These are thick, fleshy, often hairy, oblanceolate or obovate, 2-4 mm long, 0.5 to 1.5 mm wide. The scar is bilobed, approximately 1 to 1.5 mm long, the style is 2 mm long, the ovary 2 mm long. He sits on a three-lobed, 1-2 mm long bract with 0.5 to 2 mm long lobes.

The fruit is a drupe -like nut fruit. She is sitting, woody, hard, bare, 8 - to 12 - fächrig with up to 13 septa. The nut is round to obovate, 14-17 mm long and 13-16 mm wide and bears 8-9 raised ribs. At maturity sepals and style are available at the fruit tip.

Dissemination

Alfaroa williamsii occurs in Nicaragua and Costa Rica. In Nicaragua, the species from the departments of Matagalpa and Jinotega is known. It grows in around 1400 m above sea level in the Cordillera Central on former clearcut areas of cloud forests. The finds in Costa Rica will be Tapantí and San Isidro de Cartago in the Cordillera de Talamanca and the Cordillera de Tilarán.

System

The species is divided into two subspecies, which differ in the shape of the male flowers:

  • Alfaroa williamsii subsp. williamsii in Nicaragua
  • Alfaroa williamsii subsp. tapantiensis in Costa Rica

Documents

  • Antonio Molina: Two new Nicaraguan Juglandaceae. Fieldiana Botany, Volume 31, 1968, pp. 357-359.
  • Walnut Family
  • Juglandaceae
  • Tree
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