Ipomoea arborescens
| Ipomoea arborescens | ||||||||||||
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Ipomoea arborescens |
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| Scientific name | ||||||||||||
| Ipomoea arborescens | ||||||||||||
| ( Kunth ) G.Don |
Ipomoea arborescens is a plant type from the genus of Morningglory ( Ipomoea ) from the family of wind plants (Convolvulaceae). The species iswidespreadin Mexico and is called Casahuate there.
description
Ipomoea arborescens is a 5 to 15 m high tree whose trunk can reach a diameter of up to 50 cm and has a white milky sap. The bark is brightly colored. The plants are hairy with fine felting when young, the trichomes are mostly twisted and 0.1 to 0.25 mm long. In the third year at the latest, however, the plants are bald. The leaf blades are entire, ovate to lanceolate, 9 to 19 cm long and 6 to 9 cm wide. On each side of the midrib there are 12 to 18 secondary arteries. The leaves are pointed towards the front and heart-shaped at the base. The leaf surfaces are particularly hairy on the underside and there on the leaf veins. The leaf stalks are 1 to 9 cm long and usually also hairy with fine felts.
The inflorescences are one or two-flowered cymes and are terminal or axillary. They are usually on shortened, finely felted hairy, serrated side shoots with a length of 1 to 14 cm. The inflorescence stalks are 0.3 to 1.0 cm long and hairy with fine tomentose hair, if second order inflorescence stalks are present, they become 2 to 4 mm long. The non-persistent bracts reach a length of 4 to 6 mm, a width of 2 to 3 mm and are ovate-lanceolate to semicircular, the underside is finely tomentose, the upper side is finely tomentose or hairless. The flower stalks are 1.5 to 4.5 cm long, thicken towards the tip and become even thicker on the fruit. The sepals are egg-shaped or sometimes semicircular, 6 to 14 mm long, 6 to 8 mm wide. The outer sepals are the same size or slightly larger than the inner ones. The tip is blunt or blunt-prickly. The crown is white with a greenish corolla tube, 4 to 6 cm long and 4 to 6 cm in diameter and is slightly twisted in the bud . It is funnel-shaped, on the outside at the tips of the agglomeration folds of the petals (interplicae) with fine felt hair and on the edge with fine felt or silky hair. The stamens have a length of 25 to 40 mm, the anthers are 5 to 8 mm long, at their base are up to 5 mm long, glandular trichomes. The stylus has a length of 20 to 30 mm, the lower 1 to 2 mm and resistant to thickening of the fruit. The two scars are spherical and 2 to 2.5 mm long.
The fruits are two-chambered, four-lobed capsules , the lobes are 17 to 25 mm long. The seeds are hairy on the upper edges with 10 to 15 mm long trichomes.
The number of chromosomes is 2n = 30.
distribution
The species is common in the western half of Mexico . It grows in open thorn bush forests, oak savannas and dry, deciduous forests at altitudes between 50 and 1800 m.
literature
- Gordon McPherson: Studies in Ipomoea (Convolvulaceae) I. The Aborescens Group . In: Annals of the Missouri Botanical Garden , Vol. 68, 1981. pp. 527-545.
Individual evidence
- ^ Ipomoea arborescens at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
