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巴朗杜鹃 balangdujuan

被子植物门 Angiospermae
双子叶植物纲 Dicotyledoneae
合瓣花亚纲 Sympetalae
杜鹃花目 Ericales
杜鹃花科 Ericaceae
杜鹃属 Rhododendron
相关名称 Common Names
拉丁名
Rhododendron balangense Fang
中文名
巴朗杜鹃
拼音
balangdujuan
文献 Literature
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描述 Description

174. 巴朗杜鹃(植物分类学报)图版74:1-4

Rhododendron balangense Fang in Act. Phytotax. Sin. 21: 486, Pl. 2: 1. 1983; 中国四川杜鹃花130-133. 1986; L. C. Hu in Act. Phytotax. Sin. 30: 549. f. 5:3-4. 1992.

常绿灌木,高1-3米;小枝粗壮,无毛,当年生枝淡紫色或淡紫绿色,直径5毫米,去年生枝淡黄色或淡褐色,芽鳞宿存,鳞片紫色,匙形或倒卵形。叶革质,集生于小枝顶端,叶片倒卵形或椭圆状倒卵形,长6-10厘米,宽3.5-5厘米,先端急尖,基部钝或近圆形,边缘稍反卷,上面暗绿色,无毛,中脉凹入,侧脉12-13对,不明显,下面毛被两层,上层毛被淡黄色或淡黄褐色,由分枝毛组成,多少脱落,下层毛被带白色,宿存,中脉凸起,侧脉略明显或不显;叶柄长1-1.5厘米,上面平坦,下面近于圆形,无毛。顶生总状伞形花序,有花13-15朵,总轴长1-1.5厘米,密被灰白色或淡黄色丛卷毛;花梗长3-4厘米,密被灰白色或淡黄色丛卷毛;花萼小,长1-2毫米,裂片5,外面密被丛卷毛;花冠钟形,长3.5-4厘米,宽3厘米,白色,两面无毛,裂片5,圆形,长和宽约1.5厘米,顶端微缺;雄蕊10,不等长,短于花冠;花丝长1.5-2厘米,下半部密被白色微柔毛,花药长圆形,黑褐色,长1.5毫米;雌蕊短于花冠,长于雄蕊;子房长圆状圆锥形,紫色,长6毫米,无毛,花柱无毛,柱头头状。蒴果长圆柱形,长2.2-2.8厘米,直径4-6毫米,上部略弯,无毛,5裂,花萼宿存,果梗长4厘米。花期6月,果期9月。

产四川西北部。生于海拔2400-3 400米的山坡丛林中。模式标本采自四川汶川巴郎山。

本种芽鳞宿存,子房无毛等特征与平卧杜鹃 R. pronum Forrest 相同,但本种是直立灌木,叶较大,倒卵形或椭圆状倒卵形,长6-10厘米,宽3.5-5厘米,花梗较长,通常长3-4厘米,易于区别。

知识共享:署名-非商业性使用-禁止演绎 1994《中国植物志》第57(2)卷 229页 PDF

Shrubs, 1–3 m tall; young shoots and petioles glabrous; bud scales persistent. Petiole 15–30 mm, densely glandular and floccose-tomentose; leaf blade thickly leathery, obovate to elliptic-ovate, 6–10 × 3.5–5 cm; base obtuse or subrounded; margin slightly revolute; apex acute, apiculate; abaxial surface with indumentum 2-layered, upper layer yellowish to fawn, loose, ± deciduous, hairs branched, lower layer whitish, appressed, persistent; adaxial surface glabrous. Inflorescence racemose-umbellate, 13–15-flowered; rachis 10–15 mm, densely gray-white to yellowish floccose. Pedicel 3–4 cm, indumentum as for rachis; calyx lobes 5, 1–2 mm, acute, outer surface densely floccose; corolla campanulate, white, 3.5–4 × ca. 3 cm; lobes 5, orbicular, emarginate; stamens 10, unequal, filaments densely puberulent in lower half; ovary and style glabrous; stigma capitate. Peduncle ca. 4 cm. Capsule oblong-cylindric, slightly curved, 22–28 × 4–6 mm, calyx persistent. Fl. Jun, fr. Sep.

Thickets on mountain slopes; 2400–3400 m. W Sichuan.

Hu (Acta Phytotax. Sin. 30: 545. 1992) described fruiting material. Based on field observations, this species may have arisen as a hybrid of Rhododendron watsonii, which belongs to R. subsect. Grandia, in which R. balangense may fit better. However, the 5-lobed corolla is more in line with a placement in R. subsect. Taliensia.

知识共享:署名-非商业性使用-禁止演绎 FOC Vol.14PDF
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