Pachypodium rosulatum
| Pachypodium rosulatum | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pachypodium rosulatum subsp. gracilius |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Pachypodium rosulatum | ||||||||||||
| Baker |
Pachypodium rosulatum is a plant type from the genus Pachypodium in the family of Hundsgiftgewächse (Apocynaceae).
description
Pachypodium rosulatum is a perennial plant whose trunk initially grows in the shape of a bottle, but later becomes a massive caudex with a diameter of 1 m or more. Many thick, tapering, ascending branches with a length of usually 1 to 1.5 m arise from it, rarely reaching 3.5 m. The older parts of the plant are not reinforced, only on the young shoots there are pairs of conical thorns with a length of 2 to 16 mm. The leaves are usually tomentose, they are elliptical in shape, 3 to 8.5 cm long and 0.8 to 3.5 cm wide.
The flowers are in groups of two to twelve on 7 to 60 cm long pedicels , mostly they are colored yellow, but rarely white. The fruits are 6 to 20 cm long, they contain elongated seeds with a length of 6 mm.
The number of chromosomes is 2n = 18.
distribution
The species is endemic to Madagascar .
Systematics
The species was first described in 1882 by John Gilbert Baker .
Synonyms are Pachypodium cactipes K.Schum. , Pachypodium drakei Costantin & Bois and Pachypodium rosulatum var. Drakei (Costantin & Bois) Markgr. .
The internal systematics of the species is interpreted differently. GD Rowley (2002) distinguishes four varieties and one form:
- Pachypodium rosulatum f. bicolor (Lavranos & Rapanarivo) GDRowley
- Pachypodium rosulatum var. Eburneum (Lavranos & Rapanarivo) GDRowley
- Pachypodium rosulatum var. Gracilius H.Perrier
- Pachypodium rosulatum var. Inopinatum (Lavranos) GDRowley
- Pachypodium rosulatum var. Rosulatum
Jonas Lüthy and John Lavranos, on the other hand, differentiate in the first description of Pachypodium rosulatum subsp. bemarahense (2005) together with this new subspecies a total of six subspecies:
- Pachypodium rosulatum subsp. rosulatum
- Pachypodium rosulatum subsp. bemarahense Lüthy & Lavranos
- Pachypodium rosulatum subsp. bicolor (Lavranos & Rapanarivo) Lüthy
- Pachypodium rosulatum subsp. cactipes (K.Schum.) Lüthy
- Pachypodium rosulatum subsp. gracilius (H.Perrier) Lüthy
- Pachypodium rosulatum subsp. makayense (Lavranos) Lüthy
In nature the species forms hybrids with Pachypodium brevicaule ( Pachypodium × rauhii ), in culture a hybrid with Pachypodium densiflorum ( Pachypodium × hojnyi ) was bred.
proof
literature
- GD Rowley: Pachypodium . In: Urs Eggli (Ed.): Illustrated Handbook of Succulent Plants: Dicotyledons . Springer Verlag, 2002, ISBN 978-3-540-41966-2 , pp. 14-15.
Individual evidence
- ↑ Pachypodium rosulatum at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Journal of Botany London, Volume 20, p. 219, 1882 online at biodiversitylibrary.org, accessed September 30, 2018.
- ^ GD Rowley: Pachypodium . In: Urs Eggli (Hrsg.): Succulent lexicon . tape 2 : Dicotyledonous plants (dicotyledons) . Ulmer, Stuttgart 2002, ISBN 3-8001-3915-4 , p. 11 .
- ↑ Jonas Lüthy and John Lavranos: Pachypodium rosulatum ssp bemarahense a new subspecies from Madagascar . In: Cactus and Succulent Journal , Volume 77, Number 1, 2005. pp. 38-42.
