Ipomoea oenotherae
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Tuber and rosette leaves of Ipomoea oenotherae |
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| Ipomoea oenotherae | ||||||||||||
| ( Vatke ) Hallier f. |
Ipomoea Oenotherae is a species in the genus Morningglory ( Ipomoea ) from the family of wind plants (Convolvulaceae). The epithet of the species refers to the similarity to the genus Oenothera . Ipomoea oenotherae is succulent .
description
Vegetative characteristics
Ipomoea oenotherae is a perennial succulent plant. It forms a fleshy, elongated tuber 30 centimeters long and 3 centimeters in diameter, from which a rosette of leaves is formed every spring , followed by elongated, prostrate stems up to 50 centimeters long. The young stems are angular and initially provided with a silver-white felt; later they bald. The entire leaves of the rosette are linear to lanceolate and sit on petioles up to 7 centimeters long . Their leaf blades are 4 to 10 inches long and 1 inch wide. Sometimes it has basal lobes or is wavy pinnate. The leaves on the stem are shorter by up to 6 centimeters. They sit on up to 4 centimeters long petioles, have entire margins to seven lobes and are covered with a silver-white felt.
blossoms
The flowers are single in the leaf axils. The linear-awl cover sheet is 10 to 15 millimeters long and 0.5 to 1 millimeter wide. The somewhat club-like flower stalk has a length of up to 15 millimeters. The hermaphrodite, radially symmetrical flower is five-fold. The five unequal, often pink sepals are up to 15 millimeters long, ovate to ovate-lanceolate; their edges are ciliate and have thorn tips. The five mauve to purple petals grow together in a narrow funnel shape, 2.3 to 5 centimeters long. There is only one circle with five stamens . The flowering time is in summer.
Fruits and seeds
The spherical, straw-colored, smooth capsule fruit has a diameter of up to 1 centimeter. The seeds , up to 4 millimeters in size, are velvety-tomentose with grayish, pressed hair .
Distribution and systematics
Ipomoea oenotherae is widespread in the grasslands and savannas in Africa from Ethiopia and Eritrea to Namibia and Gauteng in South Africa.
It was first described in 1882 as Convolvulus oenotherae by Wilhelm Vatke (1849–1889). Johannes Gottfried Hallier placed them in the genus Ipomoea in 1893 .
One can distinguish between two varieties:
- Ipomoea Oenotherae var. Angustifolia (Oliv.) Verdc. : It occurs in tropical East Africa.
- Ipomoea oenotherae var. Oenotherae : It occurs from Eritrea to southern Africa.
proof
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, p. 171. ISBN 3-540-00489-0
- ↑ a b c d Rafaël Govaerts (Ed.): Ipomoea - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on November 26, 2017.
- ^ Botanical yearbooks for systematics, plant history and plant geography . Vol. 18, Leipzig 1894, p. 125
literature
- E. van Jaarsveld: Ipomoea oenotherae . In: Urs Eggli (Ed.): Sukkulentenlexikon Volume 2 Dicotyledonous plants (dicotyledons) with the exception of Aizoaceae, Asclepiadaceae, Cactaceae and Crassulaceae . Eugen Ulmer Verlag, Stuttgart 2002, p. 49, ISBN 3-8001-3915-4
- Maria Leonor Gonçalves: Convolvulaceae , in Flora Zambesiaca , Volume 8, Part: 1, 1987. Online.
Web links
- Entry In Traditional Food Plants of Kenya