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FOC | Family List | FOC Vol. 14 | Apiaceae | Rhododendron

434. Rhododendron dichroanthum Diels, Notes Roy. Bot. Gard. Edinburgh. 5: 212. 1912.

两色杜鹃 liang se du juan

Dwarf shrubs 1–2.5 m tall; older branches glabrous; young shoots white-floccose, sometimes with some setae. Petiole 5–10 mm, white floccose very quickly glabrescent; leaf blade leathery, narrowly elliptic, obovate to oblanceolate, 4–10 × 1.6–4 cm; base rounded to cuneate; margin revolute; apex obtuse, with a rigid apiculus; abaxial surface indumentum 1-layered, continuous, silvery white to fawn, compacted, hairs rosulate; adaxial surface green, rugose, glabrous when mature; midrib grooved adaxially; lateral veins 7–14-paired, impressed adaxially. Inflorescence umbellate, 2–8-flowered; rachis 5–8 mm, puberulent. Pedicel 1.3–2.5 cm, rufous-tomentose; calyx cupular, fleshy; lobes 5, 2–3.5 mm, puberulent, margin ciliate; corolla tubular-campanulate fleshy, yellow flushed red or orange-red, 3.5–4 cm, with 5 deeply colored nectar pouches at base, glabrous; lobes 5, suborbicular; stamens 10, 1.7–2.6 cm, filaments pubescent at base; ovary conoid, ca. 5.2 × 4 mm, rufous-tomentose or glandular-hairy; style ca. 2.6 cm, glabrous. Capsule cylindric, 10–15 × 4–6 mm. Fl. May.

Forests, alpine thickets, alpine meadows, rocky slopes, cliffs; 2600–4300 m. W Yunnan [Myanmar].


1 Young shoots usually glandular-setose; ovary glandular-hairy.   (2)
+ Young shoots setose, or setae absent; ovary without glandular hairs or with a few at base.   (3)
       
2 (1) Leaf blade 5.5–8 × 1.6–3 cm.   434d subsp. septentrionale
+ Leaf blade 6–9.5 × 2.5–4 cm.   434c subsp. scyphocalyx
       
3 (1) Leaf blade 4–7 × 2.5–3.5 cm, abaxial indumentum silvery to fawn.   434b subsp. apodectum
+ Leaf blade 4–10 × 1.6–4 cm.   (4)
       
4 (3) Leaf blade 4–10 × 3–4 cm, abaxial indumentum silvery, appressed.   434a subsp. dichroanthum
+ Leaf blade 5.5–8 × 1.6–3 cm, abaxial indumentum whitish to fawn.   434d subsp. septentrionale

Lower Taxa


 

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