Forest hydrangea
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Forest hydrangea ( Hydrangea arborescens ) |
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| Hydrangea arborescens | ||||||||||||
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The forest hydrangea ( Hydrangea arborescens ) is a species of the genus hydrangeas ( Hydrangea ) within the hydrangea family (Hydrangeaceae). The natural range is in the United States. Several cultivars are used as an ornamental plant because of the decorative inflorescences .
description
The forest hydrangea grows as a deciduous, upright, small shrub and reaches heights of 2 to 3 meters. The bark of the branches is curly haired.
The constantly against arranged on the branches leaves are divided into petiole and leaf blade. The petiole is 2 to 6 inches long. The simple leaf blade is 5 to 18 centimeters long and 3 to 12 centimeters wide and is ovate to oval to oblong-ovate with a rounded or heart-shaped blade base, a pointed or tapered upper end and a coarsely serrated leaf margin. The underside of the leaf is hairy to velvety.
The flowering period extends from June to September. The trugdoldige inflorescence has a diameter of 5 to 15, rarely 20 centimeters. The sterile flowers are about 2 inches wide and white to greenish white. The fertile flowers are white. The seeds are wingless.
The number of chromosomes is 2n = 36 or 38.
Distribution and location
The natural range of Hydrangea arborescens extends from the northeast to the southeast of the United States . The forest hydrangea grows in species-poor forests, in floodplains and on river banks on dry to fresh or moist, acidic to slightly alkaline, sandy-humic to sandy-gravelly soils in partially shaded locations. It is usually frost hardy .
Systematics
The forest hydrangea ( Hydrangea arborescens ) is a kind of the genus of the hydrangeas ( Hydrangea ) from the tribe Hydrangeae in the subfamily Hydrangeoideae within the family of the hydrangea plants (Hydrangeaceae). The first publication of Hydrangea arborescens was in 1753 by Carl von Linné in Species Plantarum .
There are three subspecies:
- Hydrangea arborescens subsp. arborescens L.
- Hydrangea arborescens subsp. discolor (Ser.) McClintock , also described as a separate species Hydrangea cinerea Small . The undersides of the leaves are dense but not closed gray-haired with often missing sterile flowers.
- Hydrangea arborescens subsp. radiata (Ser.) McClintock , also described as a separate species Hydrangea radiata Walter . The undersides of the leaves are dense and closed with white tomentose hairs with mostly numerous sterile, 2 to 3 centimeters wide flowers.
The subspecies are also understood as separate species of a collective species .
use
The forest hydrangea is used as an ornamental wood in a variety of garden forms because of its decorative inflorescences . Varieties are among others:
- 'Annabelle' with 15 to 25 centimeters wide inflorescences and only sterile, white flowers (variety of the subspecies arborescens )
- 'Grandiflora' with greenish-white, almost exclusively sterile flowers in 12 to 18 centimeter wide inflorescences (variety of the subspecies arborescens )
- 'Sterilis' with white, exclusively sterile flowers in 15 to 20 centimeters wide, hemispherical inflorescences (variety of the subspecies discolor )
proof
literature
- Andreas Roloff , Andreas Bärtels: Flora of the woods. Purpose, properties and use. With a winter key from Bernd Schulz. 3rd, corrected edition. Eugen Ulmer, Stuttgart (Hohenheim) 2008, ISBN 978-3-8001-5614-6 , pp. 338–339.
- Jost Fitschen: Woody flora . 12th, revised and expanded edition. Quelle & Meyer, Wiebelsheim 2007, ISBN 3-494-01422-1 , p. 528 .
Individual evidence
- ↑ German name according to Roloff et al .: Flora der Gehölze , p. 337 and Fitschen: Gehölzflora , p. 529
- ↑ USDA Natural Resources Conservation Services: Plant Profiles. Retrieved July 28, 2015 .
- ↑ a b c d e f Roloff et al .: Flora der Gehölze , p. 337
- ↑ a b c Fitschen: Gehölzflora , p. 529
- ^ Hydrangea arborescens at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ a b Hydrangea arborescens. In: Germplasm Resources Information Network (GRIN). United States Department of Agriculture, accessed March 20, 2012 .
- ↑ a b Hydrangea arborescens at Tropicos.org. Missouri Botanical Garden, St. Louis
