| 1 |
Pedicel and sometimes ovary densely glandular-setose. |
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(2) |
| + |
Pedicel glabrous or pubescent; ovary glabrous or pubescent, sometimes with a few glandular setae. |
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(4) |
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| 2 (1) |
Inflorescence usually 1-flowered; petiole 0–6 mm. |
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487 Rhododendron subestipitatum |
| + |
Inflorescence 5–7-flowered; petiole 10–17 mm. |
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| 3 |
Young shoots, petioles, midrib and abaxial surface of leaf blade sparsely setose or glandular-setose;
corolla purplish or pink, 4.5–5 cm. |
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484 Rhododendron henryi |
| + |
Young shoots, petioles, and both surfaces of leaf blade densely setose or glandular-setose; corolla
white or reddish, 5–6 cm |
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486 Rhododendron championiae |
| |
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| 4 (1) |
Pedicel pubescent, tomentose or setose. |
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(5) |
| + |
Pedicel glabrous. |
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(9) |
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| 5 (4) |
Inflorescence terminal, 10–15(–17)-flowered; leaves scattered along the stems. |
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480 Rhododendron cavaleriei |
| + |
Inflorescence subterminal, 1–8-flowered; leaves in apical clusters. |
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(6) |
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| 6 (5) |
Inflorescence 1–3-flowered; pedicel 1.5–2 cm. |
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(7) |
| + |
Inflorescence (3–)4–8-flowered; pedicel 2–3.5 cm. |
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(8) |
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| 7 (6) |
Pedicel yellowish brown pubescent; corolla white with yellowish flecks, 4.5–6 cm. |
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482 Rhododendron hancockii |
| + |
Pedicel sparsely reddish setose; corolla cherry red, 3–4.5 cm. |
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483 Rhododendron tutcherae |
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| 8 (6) |
Corolla 5–5.5 cm; young shoots glandular-setose. |
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485 Rhododendron dayaoshanense |
| + |
Corolla 3–3.5 cm; young shoots glabrous. |
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471 Rhododendron stamineum |
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| 9 (4) |
Inflorescence (3–)4–8-flowered. |
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(10) |
| + |
Inflorescence 1–3-flowered. |
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(15) |
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| 10 (9) |
Pedicel 1–2 cm. |
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(11) |
| + |
Pedicel 2.5–3 cm; calyx margin usually glabrous; leaves usually in apical clusters. |
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(13) |
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| 11 (10) |
Calyx lobes minute, triangular, margin usually glabrous; leaves usually in apical clusters. |
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474 Rhododendron truncatovarium |
| + |
Calyx lobes sometimes well-developed, ± linear, margin fimbriate-ciliate or glandular pectinate; leaves often scattered along the stems. |
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(12) |
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| 12 (11) |
Petiole ca. 1 cm; corolla ca. 5 cm, pink to purplish. |
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476 Rhododendron westlandii |
| + |
Petiole 1.5–2 cm; corolla 4.5–4.8 cm, white flushed yellow. |
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477 Rhododendron huguangense |
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| 13 (10) |
Calyx lobes narrowly triangular to narrowly lingulate, 5–20 mm, often ciliate; ovary truncate at insertion of style, densely yellowish tomentose. |
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481 Rhododendron longilobum |
| + |
Calyx reduced to an undulate rim or 5 minute teeth, glabrous; ovary tapering into style, glabrous or densely gray-white-tomentose. |
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(14) |
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| 14 (13) |
Lateral veins obsolete. |
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471 Rhododendron stamineum |
| + |
Lateral veins reticulate and conspicuous on both surfaces. |
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472 Rhododendron feddei |
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| 15 (9) |
Petiole 2–8 mm. |
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(16) |
| + |
Petiole 10–15 mm. |
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(18) |
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| 16 (15) |
Calyx lobes 5–13 mm; corolla white, 4.5–6 cm. |
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482 Rhododendron hancockii |
| + |
Calyx lobes 1–2 mm; corolla pale rose or rose-violet, 2.5–4 cm. |
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(17) |
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| 17 (16) |
Flower bud scales uniformly gray-white pubescent on outer surface; corolla 3.2–4 cm; capsule apex acuminate. |
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470 Rhododendron taishunense |
| + |
Flower bud scales pubescent only on margin and at apex on outer surface; corolla ca. 2.5 cm; capsule apex truncate. |
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479 Rhododendron vaniotii |
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| 18 (15) |
Corolla cherry red, without markings. |
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483 Rhododendron tutcherae |
| + |
Corolla pink to white, with a distinct darker blotch on upper lobe. |
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(19) |
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| 19 (18) |
Ovary tapering into style; pedicel 1–2 cm; inflorescence 2- or 3-flowered. |
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473 Rhododendron moulmainense |
| + |
Ovary apex truncate; pedicel 2–3 cm; inflorescence often 1-flowered. |
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(20) |
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| 20 (19) |
Corolla 5–5.7 cm; flower bud scales gray-white pubescent on outer surface. |
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475 Rhododendron mackenzianum |
| + |
Corolla 3.5–4.8 cm; flower bud scales pubescent only on margin and at apex. |
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478 Rhododendron latoucheae |
