1	Leaf blade adaxially bullate, abaxially with woolly indumentum, midrib and lateral veins prominent; pedicels stout, 1–1.5 cm.		(2)
+	Leaf blade adaxially flat, abaxially with thin indumentum, never woolly (but see R. ebianense); pedicels slender, (1.5–)2–4 cm (0.5–1 cm in R. ririei).		(4)
2 (1)	Leaf blade 7–8 cm, with dense gray-white woolly indumentum abaxially; corolla white.		321 Rhododendron farinosum
+	Leaf blade 10–15 cm, with loose woolly indumentum abaxially; corolla deep magenta or rose.		(3)
3 (2)	Leaf blade base broadly cuneate or unequally rounded, abaxial surface with yellowish indumentum; corolla rose.		320 Rhododendron denudatum
+	Leaf blade base cuneate, abaxial surface with gray-white indumentum; corolla magenta-rose.		319 Rhododendron floribundum
4 (1)	Leaf blade abaxially with silvery white or gray-white indumentum.		(5)
+	Leaf blade lamina abaxially with fawn or brownish indumentum.		(13)
5 (4)	Inflorescence 12–22-flowered.		(6)
+	Inflorescence 3–10-flowered.		(7)
6 (5)	Corolla pinkish or rose, 3–3.5 cm.		330 Rhododendron pingianum
+	Corolla creamy-white or whitish with brownish crimson spots, 2.5–3 cm.		333 Rhododendron coryanum
7 (5)	Pedicel glabrous or eglandular.		(8)
+	Pedicel glandular.		(10)
8 (7)	Corolla purple-red, 4–6 cm.		322 Rhododendron ririei
+	Corolla white or pink, 2.5–3.5 cm.		(9)
9 (8)	Pedicel pubescent; stamens 12–15(–16).		331 Rhododendron argyrophyllum
+	Pedicel glabrous; stamens 10.		332 Rhododendron hypoglaucum
10 (7)	Style glabrous.		(11)
+	Styles with hairs and or glands towards base.		(12)
11 (10)	Inflorescence rachis 10–15 mm; pedicel 1–2.5 cm; corolla 4–4.5 cm.		315 Rhododendron adenopodum
+	Inflorescence rachis to 10 mm; pedicel 2.5–3 cm; corolla ca. 3.5 cm.		325 Rhododendron shimenense
12 (10)	Abaxial leaf indumentum silvery white; inflorescence rachis 5–10 mm; pedicel 1–2 cm.		335 Rhododendron hunnewellianum
+	Abaxial leaf indumentum initially white, sometimes becoming tawny or grayish with age, upper layer loosely woolly; inflorescence rachis ca. 20 mm; pedicel 2–3.5 cm.		316 Rhododendron ebianense
13 (4)	Leaf blade narrowly oblanceolate, 1.5–2(–2.5) cm wide; rachis 0.2–0.4 cm (NE Guizhou: Fanjing Shan).		327 Rhododendron oblancifolium
+	Leaf blade elliptic or obovate-elliptic, 2–4 cm wide; rachis 1–4 cm.		(14)
14 (13)	Corolla deep crimson, base broad, with nectar pouches; petiole stout, ca. 1 cm.		323 Rhododendron brevipetiolatum
+	Corolla white or pink, base narrow, without nectar pouches; petiole 1.5–2.5 cm.		(15)
15 (14)	Corolla pink; leaf blade long-elliptic or narrow-oblanceolate; apex acuminate; pedicels slender, ca. 1 mm wide.		(16)
+	Corolla white; leaf blade elliptic-obovate or long-elliptic; apex obtuse; pedicels stout, 2–3 mm wide.		(18)
16 (15)	Leaf blade narrowly oblanceolate, 12–16 × 1.5–2.5 cm; bud scales persistent on the young shoots; pedicels, ovary, and style glandular.		334 Rhododendron thayerianum
+	Leaf blade long-elliptic or elliptic-obovate, 8–10(–13) × 2.5–4 cm, bud scales not persistent on the young shoots; style eglandular.		(17)
17 (16)	Leaf indumentum abaxially with a coppery luster; stamens 10–14, filaments pubescent at the base; ovary woolly.		318 Rhododendron insigne
+	Leaf indumentum abaxially brownish, thin not lustrous; stamens 12, filaments glabrous; ovary tomentose.		329 Rhododendron longipes
18 (15)	Leaf blade obovate or elliptic-ovate, 7–10 cm; rachis and pedicels glabrous.		324 Rhododendron simiarum
+	Leaf blade narrowly elliptic, 12–16 cm; rachis densely hairy.		(19)
19 (18)	Petiole glabrous; stamens 18–20.		317 Rhododendron haofui
+	Petiole floccose or tomentose; stamens 10–12.		(20)
20 (19)	Adaxial leaf surface not waxy; inflorescence 5–10-flowered; pedicel 2–3 cm.		326 Rhododendron formosanum
+	Adaxial leaf surface with thin layer of white wax; inflorescence 10–20-flowered; pedicel 1–1.5 cm.		328 Rhododendron fangchengense