討論:中原氏杜鵑

山羊百科，林文智老師的植物、山岳、攝影紀錄

1. Shoots with appressed, flattened, brownish bristle-like hairs; leaves dimorphic, the spring and summer leaves different in shape.

2. Stamens 5-10; flowers red, rarely pink or white.

3. Shoots densely clothed with flattened appressed hairs; bud scales not viscid; corolla funnelform to campanulate.

4. Leaves ovate to obovate or ovate-lanceolate.

5. Styles glabrous; corolla red, rarely white or pink; leaves ovate to elliptic or obovate-lanceolate.

6. Leaves elliptic-oblong or oblong-obovate, 2-5 cm long.

7. Leaves chartaceous, strigose beneath, the margins flat; corolla red 　18. R. simsii

6. Leaves ovate to obovate-lanceolate, about 1.5 cm or less long.

7. Corolla larger, about 2.5 cm long and 3-4 cm across; stamens included.

8. Dwarf prostrate shrub; corolla larger, about 4 cm across　11. R. nakaharai

8. Erect shrub; corolla smaller, about 3 cm across　8. R. longiperulatum

8. Rhododendron longiperulatum Hayata 大屯杜鵑 (大屯滿山紅)

An erect shrub, many-branched, the branches appressed-furfurescent-strigose. Leaves chartaceous, variable in size, ovate to ovate-oblong and oblong-lanceolate, 1-2.5 cm long, 0.5-1.5 cm broad, the apex acute, with an apiculate tip, the base acute to acuminate, the margins entire, revolute, the upper surface green sparingly strigose, the lower surface pale, densely furfurescent-strigose along the veins, the secondary veins 2-3 per side, inconspicuous; petioles to 2 mm long, furfurescent- strigose. Flowers terminal, 1-3, 1-2-bracteate; calyx 5-lobed, the lobes obtuse, 2.5 mm long, 1.5 mm broad, densely strigose without; corolla scarlet, funnelform, about 3 cm long and across, deeply 5-lobed to the middle; stamens 9-10, unequal, included, the filaments slightly pilose at base; ovary cylindric-ovoid, 1.5 mm long, pubescent, the style glabrous. Capsules cylindric-ovoid, 8-15 mm long, pubescent.

Endemic. Northern Taiwan, in grasslands at 700-1,000 m in the Tatun Range. Flowering in late March and April.

TAIPEI: Tatun Range, Shimada s. n. in 1910 (Type coll.), Murakami 157, Sasaki s. n. in 1924.

11. Rhododendron nakaharai Hayata 中原氏杜鵑

A low prostrate shrub, many-branched, the branchlets densely covered with appressed-furfurescent-strigose hairs. Leaves mostly crowded at top of branches, chartaceous, polymorphic, short-petiolate, ovate to oblong, 1-1.2 cm long, 0.5-1.2 cm broad, the apex acute, apiculate at the tip, the base acute to attenuate, the margins entire, revolute, the upper surface green, scattered appressed-strigose, the lower surface pale, densely furfurescent-appressed long- strigose along the costa and veins, the secondary veins 2-3 per side, indistinct; petioles to 1 mm long, furfurescent-strigose. Flowers 1-3, terminal; pedicels, about 1 cm long, densely long-furfurescent-strigose; calyx 5-lobed, the lobes obtuse, densely long-strigose without; corolla scarlet, funnelform, about 3.5 cm long and 4 cm across, deeply 5-lobed to the middle; stamens 9 or 10, unequal, or sometimes 5-6, the filaments slightly pilose at base; ovary pubescent. Capsules globose or ovoid, about 8 mm long, pubescent.

Endemic. Northern Taiwan, in grasslands at 700-1,000 m in the Tatun Range. Flowering in June.

TAIPEI: Chihsinshan, Nakahara s. n. in 1915 (Type coll.).

18. Rhododendron simsii Planch 唐杜鵑

A shrub 1-3 m high, many-branched; young branches densely appressed- strigose, the hairs gray to brown. Leaves elliptic-lanceolate to ovate-elliptic, persistent or half-persistent, very variable in size, 2-5 cm long, acute at apex, cuneate at base, sparingly strigose and dull above, more or less strigose beneath especially along the veins. Flowers 2-6-clustered at end of branchlets; calyx to 5 mm long, densely strigose and ciliate, the parts ovate to lanceolate; corolla rose-red to dark red, funnelform, 3.5-5 cm across; stamens 7-10, as long as the corolla, the anthers purple; style exserted.

Widely distributed in temperate regions of mainland China. Taiwan, confined to the southern tip of the island in the primary forests of Hengchun Peninsula. PINGTUNG: Hengchun, Furukawa s. n. in 1910.

289. 杜鵑 Rhododendron simsii Planch.

落葉灌木，高2（-5）米；分枝多而纖細，密被亮棕褐色扁平糙伏毛。葉革質，常集生枝端，卵形、橢圓狀卵形或倒卵形或倒卵形至倒披針形，長1.5-5釐米，寬0.5-3釐米，先端短漸尖，基部楔形或寬楔形，邊緣微反卷，具細齒，上面深綠色，疏被糙伏毛，下面淡白色，密被褐色糙伏毛，中脈在上面凹陷，下面凸出；葉柄長2-6毫米，密被亮棕褐色扁平糙伏毛。花芽卵球形，鱗片外面中部以上被糙伏毛，邊緣具睫毛。花2- 3 （-6）朵簇生枝頂；花梗長8毫來，密被亮棕褐色糙伏毛；花萼5深裂，裂片三角狀長卵形，長5毫米，被糙伏毛，邊緣具睫毛；花冠闊漏斗形，玫瑰色、鮮紅色或暗紅色，長3.5-4釐米，寬1.5-2釐米，裂片5，倒卵形，長2.5-3釐米，上部裂片具深紅色斑點；雄蕊10，長約與花冠相等，花絲線狀，中部以下被微柔毛；子房卵球形，10室，密被亮棕褐色糙伏毛，花柱伸出花冠外，無毛。蒴果卵球形，長達1釐米，密被糙伏毛；花萼宿存。花期4-5月，果期6-8月。

產江蘇、安徽、浙江、江西、福建、臺灣、湖北、湖南、廣東、廣西、四川、貴州和雲南。生於海拔500-1 200（-2 500）米的山地疏灌叢或松林下，為我國中南及西南典型的酸性土指示植物。

本種與皋月杜鵑 R. indicum (Linn.) Sweet相似，但不同在於後者的雄蕊為5；葉較小而狹窄，邊緣具細圓齒，易於區別。

作者仔細研究了方文培教授發表的莢蒾葉杜鵑 R. viburnifolium Fang和美麗杜鵑R. bellum Fang et G. Z. Li以及譚沛祥發表的雙色杜鵑 R. bicolor Tam 和長條杜鵑 R. petilum Tam 的模式標本和付模式標本的特徵；與杜鵑 R. simsii Planch. 的區別甚微，極難於分開，故將前四種歸併于杜鵑之中較為合理。

映山红组 Sect. 2. Tsutsusi Sweet

那克哈杜鹃 Rhododendron nakaharai Hayata

平臥矮灌木；小枝密集，剛硬，密被亮褐色扁平糙伏毛。葉集生枝端，紙質，卵形至長圓形或倒披針形至闊橢圓形，長0.6-1.2釐米，寬0.5-1.2釐米，先端鈍，具短尖頭，基部漸狹窄，邊緣微反卷，全緣，上面深綠色，下面淡白色，兩面密被糠皮狀扁平糙伏毛；葉柄長約2毫米，密被糠皮狀扁平糙伏毛。花1-3朵簇生枝頂；花梗直立，長約1釐米，密被長糙伏毛；花萼膜質，5裂，裂片闊橢圓形至卵形，長2毫米，邊緣被褐色長糙伏毛；花冠漏斗狀鐘形，鮮紅色，長約3.5釐米，直徑4釐米，深5裂，裂至中部，裂片倒卵狀渾圓形，花冠管內面基部具長柔毛；雄蕊10，長約為花冠之半，花絲近基部被長柔毛，花藥長圓形，長2毫米，黑色；子房圓錐形，長約2毫米，密被短柔毛，花柱無毛。蒴果圓球形或近於卵球形，長約8毫米，被短柔毛。花期6月。

產我國臺灣北部。生於海拔700-1 000米的草叢中。模式標本采自臺北。

本種未見標本，是根據現有的文獻資料記載整理的，待後見到標本時進行補充。

映山红组 Sect. 2. Tsutsusi Sweet

长鳞芽杜鹃 Rhododendron longiperulatum Hayata

小灌木；枝密集，纖細，密被栗褐色糙伏毛。葉紙質，變化大，卵形至卵狀長圓形或長圓披針形，長1.3-2.5釐米，寬0.5-1.5釐米，先端短漸尖至銳尖，基部楔形，邊緣全緣，反卷，上面深綠色，下面淡綠色，兩面散生糙伏毛，中脈和側脈在上面下凹，下面中脈稍凸起，細脈網狀；葉柄長2毫米，被褐色糙伏毛。花芽卵球形，具數枚鱗片，鱗片外面沿中脊疏被糙伏毛，邊緣被微柔毛。傘形花序頂生，有花2-3朵；花梗長約1.3釐米，密被亮紅褐色糙伏毛；花萼5裂，裂片三角狀卵形，長2.5毫米，寬1.5毫米，密被淡紅褐色長糙伏毛；花冠漏斗狀鐘形，紅色，長約3釐米，5深裂，裂片長圓形，長1釐米，頂端鈍圓；雄蕊10，不等長，最長者略短於花冠，花絲扁平，基部微被疏柔毛，花藥黑色，近於卵形，長約2毫米；子房圓柱狀卵球形，長達3毫米，密被淡紅褐色糙伏毛，花柱線形，無毛。蒴果圓柱狀卵球形，長8-15毫米，被糙伏毛。花期3-4月。

產我國臺灣北部。生於海拔700-1000米的草地裏。模式標本采自臺北。

本種與臺北杜鵑R. kanehirae Wils．相近，但不同在於後者的葉較大而狹窄；花較大，花柱基部被少許糙伏毛，易於區別。