|
|
|
3. Rhododendron sect. Vireya H. F. Copeland, Philipp. J. Sci. 40: 151. 1929.
越桔杜鹃组 yue ju du juan zu
Fang Ruizheng (方瑞征 Fang Rhui-cheng); David F. Chamberlain
Vireya Blume, Bijdr. 854. 1826, not Rafinesque (1814).
Shrubs or small trees, evergreen, epiphytic or terrestrial. Leaves scattered or clustered at top of branches or nodes and thus whorled. Leaf blade with both surfaces scaly, scales entire, or lobed. Inflorescence a terminal 1- to several-flowered umbel. Calyx small, cup-shaped or plate-shaped, inconspicuously 5-lobed, or margin undulate; corolla shortly tubular, funnelform, tubular-campanulate or campanulate; tube short to long and slender, erect or slightly curved; lobes slightly longer than tube or less than 1/4 as long as tube, yellow, orange-yellow, white, or pale to deep red. Stamens 10; filaments hairy at least towards base; ovary oblong to tubular or ovate, densely scaly, often hairy; style glabrous or hairy, scaly. Capsule fusiform, cylindric or oblong, scaly, often hairy. Carpels thin, ± twisted after opening, recurved. Seed often with caudate appendages on both sides.
About 300 species: mostly in tropical SE Asia, extending northwest to the Himalayas and south to N Australia; 11 species (six endemic) in China.
|
|
|
|
| 1 |
Calyx undeveloped, margin entire or undulate. |
|
(2) |
| + |
Calyx conspicuously lobed. |
|
(5) |
| |
|
|
|
| 2 (1) |
Inflorescence 1-flowered; leaf apex emarginate. |
|
(3) |
| + |
Inflorescence 4–7-flowered; leaf apex obtuse or acute, not emarginate. |
|
(4) |
| |
|
|
|
| 3 (2) |
Leaf blade 1.5–3.5 × 1–1.5 cm; ovary without hairs. |
|
174 Rhododendron emarginatum |
| + |
Leaf blade 0.6–1 × 0.2–0.5 cm; ovary pubescent. |
|
176 Rhododendron densifolium |
| |
|
|
|
| 4 (2) |
Corolla 8–10 mm; calyx undulate or with crenulate lobes. |
|
177 Rhododendron datiandingense |
| + |
Corolla 10–15 mm; calyx with triangular lobes, to 4 mm. |
|
178 Rhododendron rushforthii |
| |
|
|
|
| 5 (1) |
Leaf blade oblong-obovate, 2–5 × 1–3 cm. |
|
(6) |
| + |
Leaf blade spathulate, obovate to oblong-obovate, 1.2–2.4 × 0.5–1.2 cm. |
|
(7) |
| |
|
|
|
| 6 (5) |
Leaf apex not emarginate; calyx 1–2 mm, lobes ovate or triangular; corolla 1–1.5 cm. |
|
179 Rhododendron kawakamii |
| + |
Leaf apex emarginate; calyx 2–4 mm, lobes ovate or oblong; corolla ca. 0.8 cm. |
|
180 Rhododendron asperulum |
| |
|
|
|
| 7 (5) |
Corolla white or pale red; calyx ca. 3 mm. |
|
181 Rhododendron vaccinioides |
| + |
Corolla yellow; calyx 1–2 mm. |
|
(8) |
| |
|
|
|
| 8 (7) |
Inflorescence 1-flowered; ovary pubescent. |
|
(9) |
| + |
Inflorescence (1- or)2-flowered; ovary without hairs. |
|
(10) |
| |
|
|
|
| 9 (8) |
Calyx pubescent; corolla with red spots on three lobes. |
|
182 Rhododendron rupivalleculatum |
| + |
Calyx without hairs; corolla without spots. |
|
175 Rhododendron poilanei |
| |
|
|
|
| 10 (8) |
Young shoots densely papillate-glandular; leaf blade with lateral veins conspicuously concave adaxially; pedicels 2–2.5 cm, longer than leaves. |
|
183 Rhododendron maguanense |
| + |
Young shoots sparsely glandular; leaf blade with lateral veins inconspicuous adaxially; pedicels 1.5–2 cm, shorter than leaves. |
|
184 Rhododendron leiboense |
|
|
|
List of lower taxa
| Related Links (opens in a new window) |
|
Other Databases
|
|
|
|
|
|
|
|
|
