栎叶杜鹃Rhododendron phaeochrysum

中文名(Chinese Name):栎叶杜鹃
学名(Scientific Name):Rhododendron phaeochrysum Balf. f. et W. W. Smith
英文名(English Common Name):
别名(Chinese Common Name):
异名(Synonym):Rhododendron cuprescens Nitz.  Rhododendron dryophyllum Balf. f. et Forrest
科属(Family & Genus):杜鹃花科(Ericaceae)杜鹃属
形态特征(Description):常绿灌木,高1.5-4.5米;幼枝疏被白色丛卷毛,后变无毛。叶革质,长圆形、长圆状椭圆形或卵状长圆形,长7-14厘米,宽2.5-5.5厘米,先端钝或急尖,具小尖头,基部近于圆形或心形,上面深绿色,微皱,无毛,中脉凹入,侧脉13-16对,微凹,下面密被薄层黄棕色至金棕色多少粘结的毡毛状毛被,由放射状短分枝毛组成,中脉凸起,侧脉不显;叶柄长1-1.5厘米,疏被灰白色丛卷毛,后变无毛。顶生总状伞形花序,有花8-15朵,总轴长1-1.5厘米,无毛或疏被微柔毛;花梗长1-1.5厘米。疏被丛卷毛或无毛;花萼小,杯状,长约1毫米,裂片5,钝尖,无毛;花冠漏斗状钟形,长4-4.5厘米,白色或淡粉红色,筒部上方具紫红色斑点,内面基部被白色微柔毛,裂片5,扁圆形,长1.2-1.5厘米,宽2-2.5厘米,顶端微缺;雄蕊10,不等长,长1.5-2.5厘米,花丝下半部被白色短柔毛,花药椭圆形,黄褐色,长2.5毫米;子房圆锥形,长7毫米,无毛,花柱长2.4厘米,无毛,柱头近盘状。蒴果长圆柱形,直立,顶部微弯,长1.5-3厘米,直径4-6毫米。花期5-6月,果期9-10月。
分布(Distribution):产四川、云南和西藏。生于海拔3300-4200米的高山杜鹃灌丛中或冷杉林下。
用途(Use):
引自中国植物志英文版FOC Vol. 14 Page 388
Rhododendron phaeochrysum I. B. Balfour & W. W. Smith, Notes Roy. Bot. Gard. Edinburgh. 10: 131. 1917.
栎叶杜鹃 li ye du juan  | Apiaceae  | Rhododendron
Shrubs, 1–4.5 m tall; shoots white-floccose, glabrescent. Petiole 10–15 mm, floccose, soon glabrescent; leaf blade leathery, oblong-elliptic to ovate-oblong, 5–14 × 2–5.5 cm; base subrounded or subcordate; apex acute to mucronate; abaxial surface tawny to golden-brown or cinnamon, densely tawny to golden-brown or cinnamon agglutinated or felted tomentose, hairs branched; adaxial surface glabrous. Inflorescence racemose-umbellate, 8–15-flowered; rachis 10–15 mm. Pedicel 1–1.5 cm, sparsely floccose or glabrous; calyx lobes 5, ca. 1 mm, acute, glabrous; corolla funnel-campanulate, white to pale pink, with purplish red spots, 2–4.5 cm, lobes 5, orbicular; stamens 10, unequal, filaments pubescent in lower part; ovary ca. 7 mm, glabrous or sparsely pubescent; style ca. 2.4 cm, glabrous. Capsule oblong-cylindric, straight, slightly curved at apex, 15–30 × 4–6 mm. Fl. May–Jun, fr. Jul–Oct.
Abies forests, thickets, mountain slopes; 3000–4800 m. W Sichuan, SE Xizang, NW Yunnan.
Hybrids probably account for part of the wide variation shown by Rhododendron phaeochrysum, which extensively hybridizes with both R. aganniphum and R. przewalskii (see above) and possibly some other species.
栎叶杜鹃Rhododendron phaeochrysum

栎叶杜鹃Rhododendron phaeochrysum(责任编辑:徐晔春)

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