| 1 |
Flowers always axillary; apex of flower bud acuminate |
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1 Melodinus axillaris |
| + |
Flowers at least partly terminal; apex of flower bud rounded to subacute. |
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(2) |
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| 2 (1) |
Leaves pubescent, at least abaxially. |
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(3) |
| + |
Leaves glabrous or sparsely hairy along midvein only. |
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(5) |
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| 3 (2) |
Branchlets and leaf blade puberulent to glabrescent abaxially; lateral leaf veins ca. 15 pairs |
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11 Melodinus fusiformis |
| + |
Branchlets and leaf blade densely pubescent abaxially; lateral leaf veins 8-10 pairs. |
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(4) |
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| 4 (3) |
Leaf blade elliptic or oblong; sepals ca. 7 mm; corolla lobes narrowly elliptic, ca. 8 mm; berries ellipsoid; seeds narrowly elliptic, ca. 9 mm |
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10 Melodinus hemsleyanus |
| + |
Leaf blade broadly ovate to orbicular; sepals 3-4 mm; corolla lobes oblong, falcate, ca. 13 mm; berries fusiform; seeds orbicular, ca. 6 mm |
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12 Melodinus morsei |
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| 5 (2) |
Leaf blade with lateral veins arcuate-ascending. |
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(6) |
| + |
Leaf blade with lateral veins closely parallel at 70-80° to midvein. |
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(9) |
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| 6 (5) |
Fruit ca. 1.8 0.7 cm; shrubs to 0.6 m |
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8 Melodinus chinensis |
| + |
Fruit 5.5-10.5 2-10.5 cm; woody lianas to 10 m. |
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(7) |
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| 7 (6) |
Young branches and leaves scaly; sepals acute; fruit ca. 10.5 cm in diam. |
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2 Melodinus yunnanensis |
| + |
Plant glabrous except for inflorescences; sepals rounded; fruit to 9 cm. |
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(8) |
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| 8 (7) |
Corolla lobes falcate with a distinct subterminal notch; fruit ± globose, to 8 cm in diam. |
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3 Melodinus suaveolens |
| + |
Corolla lobes ovate; fruit cylindric-ellipsoid, ca. 5 cm wide |
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9 Melodinus cochinchinensis |
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| 9 (5) |
Material with flowers. |
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(10) |
| + |
Material with fruit. |
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(13) |
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| 10 (9) |
Corolla lobes orbicular. |
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(11) |
| + |
Corolla lobes ovate, oblong, or obliquely obovate. |
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(12) |
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| 11 (10) |
Leaf blade very narrowly elliptic, up to 2.1 cm wide; (100-1000 m; Taiwan) |
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4 Melodinus angustifolius |
| + |
Leaf blade elliptic, 3(-4) cm wide; (1600-2900 m; Guizhou, Yunnan) |
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5 Melodinus khasianus |
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| 12 (10) |
Leaf blade thinly membranous; corolla exterior and corona scales glabrous |
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6 Melodinus tenuicaudatus |
| + |
Leaf blade somewhat leathery; corolla exterior and corona scales puberulent |
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7 Melodinus magnificus |
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| 13 (9) |
Fruit ± fusiform, 2-3 cm wide, apex acuminate. |
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(14) |
| + |
Fruit ovoid or ellipsoid, 3-4 cm wide, apex rounded to subacute. |
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(15) |
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| 14 (13) |
Leaf blade very narrowly elliptic, ± leathery (100-1000 m; Taiwan) |
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4 Melodinus angustifolius |
| + |
Leaf blade oblong to narrowly oblong, membranous (800-1800 m; Guangxi, Guizhou, Yunnan) |
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6 Melodinus tenuicaudatus |
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| 15 (13) |
Fruit ca. 5.5 cm; petiole glabrous; leaf blade 0.5-4 cm wide |
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5 Melodinus khasianus |
| + |
Fruit 6-8 cm; petiole pubescent; leaf blade 4-6.5 cm wide |
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7 Melodinus magnificus |
