Rhododendron albiflorum
| Rhododendron albiflorum | ||||||||||||
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Rhododendron albiflorum |
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| Scientific name of the subgenus | ||||||||||||
| Candidastrum | ||||||||||||
| ( Sleumer ) Philipson & Philipson | ||||||||||||
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| Rhododendron albiflorum | ||||||||||||
| Hook. |
Rhododendron albiflorum is a plant from the genus of Rhododendron ( Rhododendron ) in the family of the Ericaceae (Ericaceae). It is the only species of the subgenus Candidastrum . Its range is in western North America.
description
Vegetative characteristics
Rhododendron albiflorum grows as a deciduous shrub that can reach heights of up to 2.5 meters and forms rhizomes . The bark of the main branches is smooth or furrowed. The bark of the twigs has glandless hairs made up of single- and multicellular, unbranched trichomes . The bud scales of the flower buds are hairy.
The alternate leaves arranged on the branches are divided into a petiole and a leaf blade. In addition to single and multicellular glandless trichomes, the petiole has hairs on the stalk. The thin, membranous to paper-like leaf blade has a length of 2 to 9 centimeters and a width of 0.8 to 3 centimeters, a narrow elliptical, egg-shaped or inverted shape. The leaf margins are finely serrated and ciliate on young leaves. The tip of the leaf is more or less rounded to tapering to a point. Both leaf sides are only sparsely hairy or bald.
Generative characteristics
The flowering period extends from late spring to summer, with the flowers opening soon after the leaves have unfolded. Underneath the leaves, clump- shaped inflorescences are formed on the sides , with one or two slightly overhanging flowers in the axilla of budscale-like bracts and on 9 to 15 millimeter long, hairy flower stalks. The hermaphrodite, more or less radial symmetry , five-fold flowers exude a scent reminiscent of jasmine and vanilla . The five green, hairy sepals that are only fused at their base are 5 to 17 millimeters long. The 9 to 22 millimeters long, bowl-shaped fused five petals are colored white and rarely show a yellowish markings, with 6 to 15 millimeters long corolla lobes. Each flower usually contains nine, rarely up to twelve unequal stamens between 5.5 and 14 millimeters long , which do not protrude above the corolla.
The hairy, septicidal capsule fruit standing on an upright fruit stalk is 6 to 8 millimeters long and 5 to 6 millimeters wide. The seeds have a clearly recognizable appendage.
The number of chromosomes is 2n = 26.
Occurrence
The natural range of Rhododendron albiflorum includes western Canada and the USA. In Canada, this species occurs in British Columbia and Alberta. In the United States, they are found in Washington, Oregon, Idaho, Montana, and Colorado.
Rhododendron albiflorum grows mainly in mixed coniferous forests, in alpine thickets, on the banks of flowing waters and at seepage points on rocks at altitudes of 800 to 3500 meters.
Systematics
Within the genus Rhododendron , Rhododendron albiflorum is the only species in the subgenus Candidastrum ( Sleumer ) Philipson & Philipson . The first description of Rhododendron albiflorum was in 1834 by William Jackson Hooker in Flora Boreali-Americana , 2 (7), p. 43, plate 133. A synonym for Rhododendron albiflorum Hook. is Azaleastrum albiflorum (Hook.) Rydberg .
Sometimes Rhododendron albiflorum is divided into two varieties :
- Rhododendron albiflorum Hook. var. albiflorum is the nominate form
- Rhododendron albiflorum var. Warrenii (A.Nelson) MALane : This isolated population occurs only in Colorado. It has smaller flowers and shorter stamens.
use
Rhododendron albiflorum is occasionally used as an ornamental plant .
swell
- Walter S. Judd, Kathleen A. Kron: Rhododendron . In Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Volume 8: Magnoliophyta: Paeoniaceae to Ericaceae . Oxford University Press, New York / Oxford a. a. 2009, ISBN 978-0-19-534026-6 , pp. 464 (English). (on-line).
Individual evidence
- ↑ a b c d e f g h i j Walter S. Judd, Kathleen A. Kron: Rhododendron . In Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . Volume 8: Magnoliophyta: Paeoniaceae to Ericaceae . Oxford University Press, New York / Oxford a. a. 2009, ISBN 978-0-19-534026-6 , pp. 464 (English). (on-line).
