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| 1 |
Leaves ± palmately (3-)5-7-lobed or palmately compound, with 5 leaflets. |
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(2) |
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Leaves entire, irregularly coarsely crenate or serrulate, sometimes 3-lobed. |
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(5) |
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| 2 (1) |
Leaves palmately compound, leaflets 5, entire |
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6 Merremia quinata |
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Leaves ± palmately lobed, lobes entire, undulate-lobate, to dentate. |
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(3) |
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| 3 (2) |
Leaves palmately divided nearly to base, lobes 5 or 7; corolla white, throat purple-red |
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7 Merremia dissecta |
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Leaves palmately angled or lobed; corolla yellow. |
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(4) |
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| 4 (3) |
Leaves palmately 5-7-angled or -lobed nearly to middle; outer sepals 14-18 mm, hirsute abaxially; anthers spirally twisted |
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8 Merremia vitifolia |
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Leaves deeply 3-lobed to below the middle; outer sepals 6-7 mm, glabrous; anthers straight |
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14 Merremia caloxantha |
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| 5 (1) |
Corolla glabrous outside. |
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(6) |
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Corolla with midpetaline bands densely sericeous outside at least apically, sometimes throughout. |
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(13) |
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| 6 (5) |
Peduncle very short or absent; flowers 1-3 per axil; leaves reniform to broadly ovate, 0.5-3.5 mm |
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5 Merremia emarginata |
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Peduncle distinct; flowers and leaves not as above. |
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(7) |
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| 7 (6) |
Sepals acuminate or subulate, subequal. |
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(8) |
| + |
Sepals rounded, obtuse (and apiculate in M. hainanensis), or emarginate, outer 2 clearly shorter than inner ones (± unequal in M.gemella). |
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(9) |
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| 8 (7) |
Corolla pink, pale purplish, or white, 1.2-1.9 cm; sepals 5-7 mm, subulate-mucronate; leaves ovate-cordate, 3-13 1.7-7.5 cm, apex attenuate or caudate |
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9 Merremia sibirica |
| + |
Corolla pale yellow, ca. 3 cm; sepals 10-15 mm, acuminate; leaves oblong-elliptic to ovate-lanceolate, 1.8-5 0.8-2.5 cm, apex rounded to acute |
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10 Merremia collina |
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| 9 (7) |
Inner sepals 8-10 mm; corolla 1.8-2.2 cm. |
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(10) |
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Inner sepals 5-7 mm; corolla 0.6-1.5(-2) cm. |
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(11) |
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| 10 (9) |
Pedicel terete; outer 2 sepals abaxially smooth; petiole 1.5-3 cm; Hainan |
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3 Merremia hainanensis |
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Pedicel verruculose apically; outer 2 sepals verruculose abaxially; petiole 3-8 mm; Guangxi |
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17 Merremia verruculosa |
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| 11 (9) |
Sepal margins purplish; leaves linear, oblong-lanceolate, ovate-oblong, or ovate, entire, base truncate, rounded, ± auriculate, or hastate |
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4 Merremia hirta |
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Sepal margins not colored; leaves ovate or ovate-cordate, entire, coarsely crenate, or 3-lobed, base cordate or broadly cordate. |
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(12) |
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| 12 (11) |
Outer sepals glabrous, all sepals broadly obovate to spatulate or oblong, apex emarginate and distinctly mucronate, mucro directed outward; corolla 0.6-1 cm; stems, petioles, and pedicels tuberculate |
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1 Merremia hederacea |
| + |
Outer sepals usually ± pilose abaxially, all sepals broadly obovate to ± circular, apex emarginate, not or only slightly mucronulate; corolla 1.5-2 cm; stems, petioles, and pedicels without tubercles |
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2 Merremia gemella |
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| 13 (5) |
Pedicel with a thick lobed ring immediately below calyx; stems and leaves densely pubescent or mealy, especially when young; extreme S Taiwan |
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19 Merremia similis |
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Pedicel without a thick lobed ring below calyx; stems and leaves glabrous, or tomentose and later glabrescent; mainland or Hainan (M.umbellata rare in Taiwan). |
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(14) |
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| 14 (13) |
Corolla lilac, pink, or white; seeds glabrous. |
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(15) |
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Corolla yellow or white; seeds pubescent, at least on margins (unknown in M.caloxantha). |
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(16) |
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| 15 (14) |
Leaves rhombic, rhombic-ovate, or nearly circular, base cuneate; corolla narrowly campanulate, 3.5-4 cm |
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11 Merremia yunnanensis |
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Leaves cordate, base cordate; corolla funnelform, 2-2.5 cm |
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16 Merremia longipedunculata |
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| 16 (14) |
Outer 2 sepals shorter than inner ones. |
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(17) |
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All sepals ± equal. |
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(19) |
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| 17 (16) |
Inflorescences lax cymes, usually 2- to several flowered, rarely flowers solitary; outer sepals elliptic, glabrous; plants with tubers |
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13 Merremia hungaiensis |
| + |
Inflorescences dense umbelliform or corymbose cymes, flowers few to many; outer sepals broadly ovate or broadly elliptic to nearly circular; tubers absent. |
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(18) |
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| 18 (17) |
Leaves usually nearly circular, rarely broadly ovate; inflorescence a many-flowered corymbiform cyme; corolla 1.4-2(-3.2) cm, yellow, midpetaline bands densely sericeous |
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18 Merremia boisiana |
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Leaves usually ovate or ovate-oblong to oblong-lanceolate; inflorescence a few- to many-flowered umbelliform cyme; corolla 2.5-5.5 cm, white (or ?yellow), midpetaline bands pubescent only at apex |
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12 subsp. orientalis |
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| 19 (16) |
Woody climber, pubescent to tomentose (older parts glabrous); corolla 1.4-2(-3.2) cm, midpetaline bands sericeous throughout their length |
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18 Merremia boisiana |
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Herbaceous twiner, subglabrous or glabrescent (petioles pilose apically); corolla 3-4 cm, midpetaline bands hairy at apex only. |
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(20) |
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| 20 (19) |
Leaf blade deeply 3-lobed, 3-3.5 cm; petiole 1.3-2.2 cm; sepals 6-7 mm, all obovate |
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14 Merremia caloxantha |
| + |
Leaf blade entire, cordate, 5-7 cm; petiole 3-6 cm; sepals ca. 10 mm, outer 2 elliptic, inner 3 obovate |
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15 Merremia cordata |
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