Graptopetalum bellum
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Graptopetalum bellum |
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| ( Moran & J.Meyrán ) DRHunt |
Graptopetalum bellum is a species of the genus Graptopetalum in the thick-leaf family(Crassulaceae).
description
Vegetative characteristics
Graptopetalum bellum forms flat, densely leaved rosettes with a diameter of 3 to 8 centimeters, which grow individually or in groups. The approximately 25 to 50, dark to grayish green leaves of a rosette are obovate to wedge-shaped, broadly blunt to rounded. They are 2 to 3.5 inches long, 1.5 to 2.8 inches wide and between 4 and 5 millimeters thick. The leaves are somewhat papilose and have an attached tip, 2 millimeters long.
The main root is thickened and reaches a diameter of up to 4 millimeters.
Inflorescences and flowers
The inflorescence is an upright thyrsus with 1 to 4 ascending, winding branches with up to 3 flowers each . The green flower stem is 1.5 to 3.5 centimeters, the flower stalk between 10 and 25 millimeters long.
The 5-fold (rarely 4-fold) flowers are almost odorless. The almost identical, elliptical to elongated, pointed, light green sepals are slightly bent back at the end of the flowering period. They are 6 to 11 millimeters long and 2 to 4 millimeters wide. The corolla has a diameter of 30 (rarely 23) to 39 millimeters with a cup-shaped, 3 to 4 millimeter long and 4 to 6 millimeter wide tube. The pointed ones. deep pink petals are elliptical-ovate, entire or the edge is finely serrated in the middle. They reach a length of 11 to 18 millimeters and a width of 6 to 10 millimeters. At the base sit two rounded growths that close the corolla tube and which enclose the epipetal stamens.
The pink-colored, 7 to 11 millimeter long stamens are fused with the corolla tube over a length of 3 to 4 millimeters. The whitish, about 0.35 to 1 millimeter long nectar flakes are upright and trimmed at the top. The intensely red, 10 to 15 millimeters long and 2.25 millimeters wide carpel is almost free at the base, keeled dorsally and, with the exception of the base, 2-furrowed. The gradually narrowing stylus is between 2.5 and 4.5 millimeters long.
Systematics, number of chromosomes and distribution
Graptopetalum bellum grows in the Mexican state of Chihuahua on rocks at an altitude of 1,600 meters and is only known from the locality of the type.
The species was discovered in 1972 by Alfred Bernhard Lau . It was first described as Tacitus bellus , now a synonym , in 1974 by Reid Venable Moran and Jorge Meyrán . By David Richard Hunt the species was placed in the genus Graptopetalum in 1979 .
The chromosome number is approximate .
proof
literature
- J. Thiede: Graptopetalum bellum . In: Urs Eggli: Succulents Lexicon Volume 4. Crassulaceae (thick-leaf plants) . Ulmer, Stuttgart 2003, p. 134, ISBN 3-8001-3998-7 .
Individual evidence
- ↑ Cactaceas y Suculentas Mexicanas . Volume 19, No. 4, p. 77, Azcapotzalco, Mexico City 1974
- ↑ Botanical Magazine; or, Flower-Garden Displayed . Volume 182, No. 4, p. 130, London 1979
Web links
- The Cactaceae . Issue 5/2003 (maintenance and propagation; PDF; 261 kB)