| 1 |
Gynophore somewhat shorter to almost as long as ovary at anthesis, distinctly elongated in fruit; corolla persistent in fruit. |
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(2) |
| + |
Gynophore distinctly shorter than ovary at anthesis and in fruit; corolla not persistent or at least withered in fruit. |
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(7) |
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| 2 (1) |
Fruit a capsule. |
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(3) |
| + |
Fruit a berry. |
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(4) |
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| 3 (2) |
Calyx lobes 2-4 mm, tube wingless or narrowly winged; petiole 3-10 mm; leaf blade membranous |
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2 Tripterospermum discoideum |
| + |
Calyx lobes 6-9 mm, tube with 5 keeled ridges; leaves sessile or subsessile; leaf blade herbaceous |
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3 Tripterospermum chinense |
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| 4 (2) |
Corolla white; seeds distinctly winged |
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6 Tripterospermum volubile |
| + |
Corolla pale yellow, pink, blue, violet, or purple (occasionally white in T. lanceolatum); seeds obscurely winged or wingless (unknown in T. filicaule). |
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(5) |
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| 5 (4) |
Anthers ca. 1.5 mm; leaf blade usually ovate |
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7 Tripterospermum filicaule |
| + |
Anthers 1-1.2 mm; leaf blade usually lanceolate, occasionally narrowly ovate. |
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(6) |
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| 6 (5) |
Calyx tube narrowly winged; fruit exserted from corolla |
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5 Tripterospermum lanceolatum |
| + |
Calyx tube wingless; fruit included in corolla |
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8 Tripterospermum pingbianense |
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| 7 (1) |
Stems trailing and rooting at nodes, not twining; leaf blade ovate to cordate (usually lanceolate to ovate in T. microphyllum). |
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(8) |
| + |
Stems twining; leaf blade lanceolate to ovate. |
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(10) |
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| 8 (7) |
Leaf blade base rounded to truncate; corolla less than 3.5 cm |
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9 Tripterospermum microphyllum |
| + |
Leaf blade base of larger leaves cordate; corolla over 3.5 cm. |
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(9) |
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| 9 (8) |
Calyx lobes linear to oblanceolate; gynophore of mature fruit 4-7 mm; pistil exserted from corolla |
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10 Tripterospermum cordifolium |
| + |
Calyx lobes linear-subulate to lanceolate; fruit scarcely stipitate; pistil included in corolla |
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11 Tripterospermum cordifolioides |
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| 10 (7) |
Fruit a capsule |
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1 Tripterospermum coeruleum |
| + |
Fruit a berry. |
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(11) |
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| 11 (10) |
Calyx tube cylindric, with puberulent and/or scabrous-ciliate ridges; lobes shorter than tube |
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16 Tripterospermum hirticalyx |
| + |
Calyx tube campanulate, smooth or with nonciliate ridges; lobes usually longer than tube. |
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(12) |
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| 12 (11) |
Corolla white, greenish white, or pale yellow, at most tinged with purple. |
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(13) |
| + |
Corolla distinctly rose-violet, blue, or purple. |
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(15) |
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| 13 (12) |
Bracts ovate to triangular; ovary distinctly longer than calyx tube |
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14 Tripterospermum taiwanense |
| + |
Bracts lanceolate; ovary as long as calyx tube. |
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(14) |
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| 14 (13) |
Calyx lobes linear to linear-lanceolate; corolla plicae semiorbicular; seeds narrowly winged |
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12 Tripterospermum pallidum |
| + |
Calyx lobes lanceolate; corolla plicae ovate to triangular; seeds wingless |
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15 Tripterospermum alutaceifolium |
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| 15 (12) |
Fruit subglobose; corolla 1.8-3.2 cm |
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4 Tripterospermum luzonense |
| + |
Fruit ellipsoid; corolla 3.3-5 cm. |
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(16) |
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| 16 (15) |
Ovary about as long as calyx tube. |
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(17) |
| + |
Ovary distinctly longer than calyx tube. |
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(18) |
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| 17 (16) |
Peduncle with scalelike or subulate bracts; calyx lobes arcuate spreading |
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13 Tripterospermum australe |
| + |
Peduncle with leafy bracts; calyx lobes ascending or recurved only near tip |
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17 Tripterospermum cordatum |
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| 18 (16) |
Corolla dark violet-blue; leaves thicker than membranous |
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18 Tripterospermum nienkui |
| + |
Corolla rose-violet; leaf blade membranous |
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19 Tripterospermum membranaceum |
