Geissospermum laeve
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Geissospermum laeve |
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| ( Vell. ) Miers |
Geissospermum laeve is a tree in the dog venom family from the subfamily Rauvolfioideae. It occurs in northern and northeastern Brazil and in the Guyanas .
description
Geissospermum laeve grows as an evergreen tree up to 25–30 meters high. The trunk diameter reaches over 60 centimeters. The trunk is sometimes grooved or "fenced" and the grayish to red-brown bark is fibrous and rough to furrowed. The tree has a milky sap .
The simple, short-stalked, almost bare and papery leaves are alternate, screwy. The short petiole is up to 0.8 inches long. The leaves are (narrow) ovate to obovate or elliptical to elongated, with entire margins and pointed to pointed or, less often, rounded at the tip. They are about 6–9 inches long and 2.5–3.5 inches wide. The young leaves are whitish hairy on the underside and then bald. The veins are pinnate with indistinct, fine side veins
The composed zymous, brownish hairy inflorescences containing some flowers appear mostly laterally between the leaf nodes. The short-stalked flowers are five-fold with a double flower envelope . They are each underlaid by small bracts . The small, brownish hairy on the outside, bald on the inside and up to 4 millimeters long sepals are ovate and short overgrown. The yellow-brownish crown is fused in the shape of a salver plate with thick, fleshy and roofy, brownish outside, yellowish hairy inside, elliptical and expansive, up to 1 cm long tips. The long, brownish-hairy and ribbed, about 1 centimeter long and narrow corolla tube has two small slits behind the stamens . The short, almost sessile stamens sit at the top of the corolla tube. The brownish hairy ovary , made up of two free carpels , is on top. The enclosed, club-shaped and bald, gynobasic stylus with a stylus head (clavuncula), with two small appendages at the tip, extends approximately to the anthers.
Leathery, densely brownish hairy, balding and, when ripe, green, smooth, short-pointed, egg-shaped to narrow-egg-shaped or elongated-ellipsoidal, multi-seeded, up to 5.5–8 cm long and 2–3.5 cm wide berries ( Panzerberry), which sometimes appear in pairs. They contain milky sap and up to about 5–10 seeds are whitish and lie in a central row in a yellow-whitish pulp. If the ripe fruits lie longer they turn yellow and then brownish. The flat, egg-shaped to elliptical, disc-shaped seeds are up to about 1.7 inches long and 0.8-1.3 inches wide.
Taxonomy
The first description of the Basionym Tabernaemontana laevis was in 1829 by José Mariano da Conceição Vellozo in Fl. Flumin. 3: 105, t. 18. The division into the genus Geissospermum took place in 1878 by John Miers in Apocyn. S. Amer .: 84. Other synonyms are Geissospermum martianum Miers and Geissospermum vellosii Allemão
use
The bark is used medicinally. The medium-weight, moderately resistant wood is used for some applications.
literature
- Harri Lorenzi: Árvores Brasileiras. Vol. 2, Instituto Plantarum, 1998, ISBN 85-86714-07-0 , p. 27, online at StuDocu.
- CGP Quinet, RHP Andreata: Estudo taxonômico e morfológico das espécies de Apocynaceae Adans. na reserva Rio das Pedras, município de Mangaratiba, Rio de Janeiro, Brasil. In: Botânica. No. 56, 2005, pp. 13–74, online (PDF; 12.5 MB), at IAP - Instituto Anchietano de Pesquisas - Unisinos.
- Joachim W. Kadereit , Volker Bittrich: The Families and Genera of Vascular Plants. Vol.XV : Flowering Plants Eudicots , Springer, 2018, ISBN 978-3-319-93604-8 , pp. 223, 241, 255 f.
- L. Allorge-Boiteau: Flore de Guyanes Apocynaceae. 2017, online (PDF; 15.1 MB), at Ile Rouge - Botanique et Madagascar.
Web links
- Geissospermum laeve at Useful Tropical Plants.
- Geissospermum laeve on plantsystematics.org (pictures).
- La plante du mois at Réserve Naturelle Régionale Trésor.
- Pao Pereira at Tropilab.