Rhododendron hypoglaucum
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Rhododendron hypoglaucum is a plant from the genus of Rhododendron ( Rhododendron ) in the family of the Ericaceae (Ericaceae). The natural range includes some provinces in central China .
description
Appearance and foliage leaf
Rhododendron hypoglaucum grows as an evergreen shrub that can reach heights of growth of 3 to 10 meters. The bark of the main branches is colored gray. The greenish bark of the branches is smooth and hairless.
The alternate leaves arranged on the branches are divided into a petiole and a leaf blade. The bald, cylindrical petiole is 1 to 2 inches long. The simple, leathery leaf blade is 6 to 10 centimeters long and 2 to 3.5 centimeters wide and lanceolate-elliptical or lanceolate-obovate with a wedge-shaped blade base and pointed end. The smooth leaf margin is slightly bent. The smooth top of the leaf is hairless and light green in color, while the underside of the leaf has fine, soft, silvery-white hairs ( trichomes ). There are 10 to 14 leaf veins on each side of the central rib, which is clearly raised on the underside of the leaf .
Inflorescence and flower
The flowering period extends from April to May. The inflorescence has 0.5 to 1.5 centimeters long, yellowish fluffy hairy to bald rhachis and contains four to nine flowers. The bare flower stalk is 2 to 3 inches long.
The hermaphrodite flowers are five-fold with a double flower envelope . The five membranous sepals are ovate-triangular with a length of 2 millimeters. The five petals 2.5 to 3.5 centimeters long and narrowed at their base are fused together in the shape of a funnel to a bell. The five almost circular crown lobes with a length of about 1 centimeter and a width of about 1.5 centimeters are edged. The color of the petals is white, tinged more or less pink and they have numerous dark pink to purple spots. There are two circles with five stamens each; they are different and 1.5 to 2 inches long. The stamens widened at their base have dense, white, downy hairs at the base. The ovary, which is cylindrical with a length of 4 to 5 millimeters, is bare or rarely has glandular hair on its tip. The hairless stylus is 2 to 2.5 centimeters long.
fruit
When ripe, with a length of 2 to 2.5 centimeters and a diameter of about 6 millimeters, the cylindrical, bald capsule fruit opens with six lobes. The fruits ripen from July to September.
Occurrence
The natural range of Rhododendron hypoglaucum is in China. It includes the provinces of Chongqing , western Hubei , southern Shaanxi, and eastern Sichuan .
Rhododendron hypoglaucum mainly inhabits thickets and occurs at altitudes of 1500 to 2100 meters.
Systematics
Rhododendron hypoglaucum belongs to the subsection Argyrophylla (Tagg) Sleumer in the subgenus Hymenanthes (Blume) K.Koch (with only evergreen species) within the genus Rhododendron . The first description of Rhododendron hypoglaucum was in 1889 by William Hemsley in the Journal of the Linnean Society, Botany , Volume 26 (173), 25. synonyms for Rhododendron hypoglaucum include Rhododendron argyrophyllum subsp. hypoglaucum (Hemsl.) DFChamb. and Rhododendron gracilipes Franchet .
swell
- Fang Mingyuan (方明渊), Fang Ruizheng (方 瑞 征 Fang Rhui-cheng), He Mingyou (何明友), Hu Linzhen (胡琳贞 Hu Ling-cheng), Yang Hanbi (杨汉 碧) & David F. Chamberlain: Ericaceae . Rhododendron. In: Wu Zheng-Yi & Peter H. Raven (Eds.): Flora of China . Apiaceae through Ericaceae. tape 4 . Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2005, ISBN 1-930723-41-5 , Rhododendron hypoglaucum , pp. 374 (English, efloras.org - this work is online with the same text). (Sections Description, Distribution and Systematics)
Individual evidence
- ↑ Rhododendron subg. Hymenanthes (Blume) K. Koch in the Flora of China .
- ↑ a b c d e f Fang Mingyuan (方明渊), Fang Ruizheng (方 瑞 征 Fang Rhui-cheng), He Mingyou (何明友), Hu Linzhen (胡琳贞 Hu Ling-cheng), Yang Hanbi (杨汉 碧) & David F. Chamberlain: Ericaceae . Rhododendron. In: Wu Zheng-Yi & Peter H. Raven (Eds.): Flora of China . Apiaceae through Ericaceae. tape 4 . Science Press and Missouri Botanical Garden Press, Beijing and St. Louis 2005, ISBN 1-930723-41-5 , Rhododendron hypoglaucum , pp. 374 (English, efloras.org - this work is online with the same text).
- ↑ Rhododendron subsect. Argyrophylla (Tagg) Sleumer in the Flora of China .
