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

224. Rhododendron orbiculare Decaisne, Fl. Serres Jard. Eur. 22: 169. 1877.

团叶杜鹃 tuan ye du juan

Shrubs, rarely small trees, 1–4.5(–15) m tall; young shoots usually ca. 5 mm in diam., green, glabrous. Petiole cylindric, 30–70 mm, glabrous; leaf blade thickly leathery, oblong to orbicular, 5–12.5 × 5.5–10.5 cm; base cordate-auriculate to rounded, the lobes often overlapping; apex obtuse or rounded; both surfaces usually glabrous; abaxial surface glaucous; adaxial surface green; midrib raised abaxially, grooved adaxially; lateral veins 10–14-paired, impressed adaxially. Inflorescence 7- or 8-flowered; rachis 15–25 mm, glandular. Pedicel 2.5–3.5 cm, puberulent, glandular; calyx ca. 1.5 mm, margin undulate, glandular; corolla campanulate, rose, 3.2–3.5 cm, glabrous; lobes 6–8, ovate, 1.3–1.5 × ca. 1.8 cm, emarginate; stamens 11–14, 1–2 cm, filaments glabrous; ovary conoid, ca. 8 × 2.5 mm, densely glandular-hairy; style ca. 1.8 cm, glabrous; stigma capitate, ca. 2 mm in diam. Capsule cylindric, curved, 22–30 × 5–6 mm. Fl. May–Jun, fr. Aug–Oct.

Forests, rocky slopes; 1400–3500(–4000) m. NE Guangxi, SW Sichuan.

Rhododendron orbiculare subsp. maolingense G. Z. Li (Guihaia 15: 294. 1995), described from Guangxi, is said to differ from subsp. orbiculare in its relatively narrow leaf blade (6–16 × 4–7 cm), longer corolla (ca. 7 cm), more numerous stamens (15–16), and more massive capsule (3–4 × ca. 1.5 cm). From the abbreviated description, it may be a species distinct from R. orbiculare; however, a proper comparison with other species in R. subsect. Fortunea is required.

1 Leaf blade oblong, base cordate; corolla 6-lobed; stamens ca. 11.   224c subsp. oblongum
+ Leaf blade ovate-orbicular or orbicular, base auriculate-cordate or subcordate to rounded; corolla 7-lobed; stamens 14.   (2)
2 (1) Leaf base auriculate-cordate, blade 5–10.5 cm.   224a subsp. orbiculare
+ Leaf base subcordate or rounded, blade 8–12.5 cm.   224b subsp. cardiobasis

Lower Taxa


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