| 1 |
Leaves simple, rarely mixed with 2- or 3-foliolate ones |
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(2) |
| + |
Leaves palmately or pedately compound |
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(4) |
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| 2 (1) |
Young branches and petiole ± pubescent; leaf veinlets abaxially inconspicuously raised; calyx teeth conspicuous, conical; petals pubescent. |
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18 T. subtetragonum |
| + |
Young branches and petiole glabrous; leaf veinlets abaxially ± raised; calyx teeth inconspicuous; petals glabrous |
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(3) |
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| 3 (2) |
Leaves subleathery; peduncle 2-3.5 cm, pubescent; pedicels 2-3 mm, pubescent. |
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15 T. erubescens |
| + |
Leaves papery; peduncle 8-13.5 cm, glabrous; pedicels 4-10 mm, glabrous. |
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5 T. longipedunculatum |
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| 4 (1) |
Leaves pedately 5-7-foliolate |
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(5) |
| + |
Leaves digitately palmately 3-5-foliolate |
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(26) |
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| 5 (4) |
Leaflets abaxially pubescent or at least on veins |
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(6) |
| + |
Leaflets abaxially glabrous |
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(10) |
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| 6 (5) |
Margin of central leaflet 12-24-toothed on each side; seeds elliptic or obtriangular |
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(7) |
| + |
Margin of central leaflet 4-9-toothed on each side; seeds elliptic or obovoid-elliptic |
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(8) |
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| 7 (6) |
Branchlets, petioles, and abaxial veins densely ferruginous villous; petals corniculate; seeds elliptic, surface smooth. |
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3 T. tonkinense |
| + |
Branchlets, petioles, and abaxial veins pilose; petals not corniculate; seeds obtriangular, surface with ribs. |
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31 T. rumicispermum |
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| 8 (6) |
Leaflets leathery or subleathery, petiole conspicuously corrugated when dry. |
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29 T. pubinerve |
| + |
Leaflets papery, petiole inconspicuously corrugated when dry |
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(9) |
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| 9 (8) |
Calyx teeth small and inconspicuous. |
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41 T. serrulatum |
| + |
Calyx teeth obvious and long. |
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17 T. henryi |
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| 10 (5) |
Peduncle glabrous |
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(11) |
| + |
Peduncle pubescent or papillose |
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(18) |
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| 11 (10) |
Leaflet margin 3- or 4(or 5)-toothed on each side |
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(12) |
| + |
Leaflet margin 7-14(or 15)-toothed on each side |
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(13) |
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| 12 (11) |
Central leaflet elliptic-lanceolate; berries oblong. |
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14 T. caudatum |
| + |
Central leaflet obovate-elliptic; berries obovoid-elliptic. |
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28 T. godefroyanum |
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| 13 (11) |
Petals apically conspicuously corniculate |
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(14) |
| + |
Petals galeate, or inconspicuously corniculate at apex |
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(15) |
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| 14 (13) |
Lianas, robust, woody; old branches gray and tuberculate; seeds obtriangular, surface with ribs. |
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32 T. ceratopetalum |
| + |
Lianas, slender; old branches green-brownish or purplish, not tuberculate; seeds globose, surface finely corrugated. |
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41 T. serrulatum |
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| 15 (13) |
Leaves pedately 7-foliolate. |
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34 T. jingdongense |
| + |
Leaves pedately 5-foliolate, sometimes 7-foliolate |
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(16) |
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| 16 (15) |
Branchlets gray; seeds globose, surface corrugated. |
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26 T. xishuangbannaense |
| + |
Branchlets greenish; seeds obtriangular, surface with ribs |
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(17) |
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| 17 (16) |
Leaflets obovate-oblong or obovate-elliptic, base nearly rounded, that of central leaflet broadly cuneate, apex acute or acuminate. |
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30 T. lenticellatum |
| + |
Leaflets obovate-lanceolate or obovate, base cuneate, apex caudate-acuminate or mucronate. |
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31 T. rumicispermum |
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| 18 (10) |
Petals apically conspicuously corniculate |
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(19) |
| + |
Petals apically galeate, not corniculate |
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(20) |
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| 19 (18) |
Calyx teeth inconspicuous; leaves pedately 5-foliolate, mixed with 3-foliolate leaves. |
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27 T. pachyphyllum |
| + |
Calyx teeth conspicuous; leaves pedately 5-foliolate, mixed with 3- or 7-foliolate leaves. |
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17 T. henryi |
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| 20 (18) |
Calyx teeth conspicuous; leaflets lanceolate. |
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2 T. lineare |
| + |
Calyx teeth inconspicuous; leaflets oblanceolate, elliptic, or elliptic-lanceolate |
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(21) |
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| 21 (20) |
Central leaflet oblanceolate, margin 12-16-toothed; calyx cupular. |
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36 T. tsaianum |
| + |
Central leaflet elliptic or elliptic-lanceolate, margin 4-10-toothed; calyx saucer-shaped |
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(22) |
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| 22 (21) |
Ovary brownish pubescent. |
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33 T. macrocorymbum |
| + |
Ovary glabrous |
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(23) |
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| 23 (22) |
Leaves pedately 5-foliolate, rarely 4- or 6-foliolate |
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(24) |
| + |
Leaves pedately 7-foliolate |
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(25) |
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| 24 (23) |
Leaves leathery; inflorescence leaf-opposed, longer than petiole. |
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23 T. xizangense |
| + |
Leaves papery; inflorescence axillary, shorter than petiole. |
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24 T. lincangense |
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| 25 (23) |
Berry 2.5-3 cm in diam.; seeds elliptic, surface corrugated. |
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25 T. jinghongense |
| + |
Berry 0.8-1.5 cm in diam.; seeds obtriangular, surface with ribs. |
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35 T. delavayi |
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| 26 (4) |
Leaves palmately 5-foliolate |
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(27) |
| + |
Leaves 3-foliolate |
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(35) |
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| 27 (26) |
Tendrils digitately branched |
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(28) |
| + |
Tendrils bifurcate or unbranched |
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(29) |
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| 28 (27) |
Inflorescence a compound cyme. |
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43 T. yunnanense |
| + |
Inflorescence a simple umbel. |
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44 T. obtectum |
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| 29 (27) |
Leaves abaxially densely pubescent or hirsute, then becoming sparsely so |
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(30) |
| + |
Leaves abaxially glabrous |
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(31) |
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| 30 (29) |
Branchlets, petioles, rachises, and abaxial leaf surface rusty pubescent, hairs 0.2-0.4 mm. |
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21 T. sichouense |
| + |
Branchlets, petioles, rachises, and abaxial leaf surface brownish hirsute, hairs 2-3 mm. |
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22 T. obovatum |
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| 31 (29) |
Branches 1.5-2 mm in diam.; inflorescence a simple umbel. |
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40 T. hypoglaucum |
| + |
Branches 3-6 mm in diam.; inflorescence a compound dichasium or polychasium |
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(32) |
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| 32 (31) |
Inflorescence cauliflorous (on old stems). |
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20 T. cauliflorum |
| + |
Inflorescence on current year’s branches |
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(33) |
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| 33 (32) |
Petals apically conspicuously corniculate. |
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15 T. erubescens |
| + |
Petals apically galeate, not corniculate |
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(34) |
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| 34 (33) |
Central leaflet lanceolate, narrowly lanceolate, or ovate-lanceolate; style inconspicuous. |
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19 T. planicaule |
| + |
Central leaflet obovate-elliptic; style conspicuous. |
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21 T. sichouense |
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| 35 (26) |
Tendrils digitately branched. |
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42 T. triphyllum |
| + |
Tendrils bifurcate or unbranched |
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(36) |
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| 36 (35) |
Leaves abaxially pubescent or at least on veins |
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(37) |
| + |
Leaves abaxially glabrous |
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(38) |
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| 37 (36) |
Leaflets abaxially pubescent; calyx teeth subulate, ca. 1/2 as long as petals. |
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17 T. henryi |
| + |
Leaflets abaxially pubescent only on veins; calyx teeth inconspicuous. |
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7 T. jinxiuense |
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| 38 (36) |
Pedicels glabrous |
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(39) |
| + |
Pedicels ± pubescent or papillose |
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(42) |
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| 39 (38) |
Leaflets entire at margin. |
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6 T. yiwuense |
| + |
Leaflets toothed at margin |
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(40) |
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| 40 (39) |
Shrubs, erect or nearly erect. |
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4 T. apiculatum |
| + |
Lianas |
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(41) |
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| 41 (40) |
Leaves usually 4-6(-8) × 2-3 cm; petiole 1-2 cm; inflorescence axillary. |
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38 T. formosanum |
| + |
Leaves usually 7-12 × 4-6.2 cm; petiole 5-10 cm; inflorescence opposite or pseudo-opposite to leaves. |
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39 T. lanyuense |
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| 42 (38) |
Leaves leathery or subleathery, veinlets raised on abaxial surface or both surfaces |
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(43) |
| + |
Leaves papery, veinlets inconspicuously raised |
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(44) |
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| 43 (42) |
Leaves subleathery, veinlets raised only on abaxial surface. |
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11 T. kwangsiense |
| + |
Leaves leathery, veinlets raised on both surfaces. |
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8 T. retinervium var. pubescens |
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| 44 (42) |
Petals apically galeate, not corniculate |
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(45) |
| + |
Petals apically conspicuously corniculate |
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(47) |
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| 45 (44) |
Leaflets rhombic-oval, abaxially conspicuously glaucous; petals pilose with white hairs. |
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9 T. campylocarpum |
| + |
Leaflets elliptic, elliptic-lanceolate, or obovate-elliptic, abaxially not glaucous; petals glabrous |
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(46) |
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| 46 (45) |
Branchlets smooth with sparse lenticels; central leaflet elliptic or elliptic-lanceolate. |
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10 T. funingense |
| + |
Branchlets conspicuously tuberculate; central leaflet usually obovate-oval. |
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13 T. pseudocruciatum |
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| 47 (44) |
Calyx teeth conspicuous, cone-shaped, ca. 1/2 as long as petals. |
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17 T. henryi |
| + |
Calyx teeth small and inconspicuous |
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(48) |
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| 48 (47) |
Herbaceous climbers; seed surface smooth |
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(49) |
| + |
Woody lianas; seed surface corrugated |
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(50) |
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| 49 (48) |
Petals ± papillose; ventral holes of seeds parallel with ventral raphe. |
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1 T. papillatum |
| + |
Petals glabrous; ventral holes of seeds furrowed. |
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37 T. hemsleyanum |
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| 50 (48) |
Leaves obovate-elliptic; petals densely papillose; berries globose. |
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27 T. pachyphyllum |
| + |
Leaves elliptic or lanceolate; petals glabrous; berries ellipsoid |
|
(51) |
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| 51 (50) |
Branches tuberculate; inflorescence densely compact; style inconspicuous. |
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12 T. cruciatum |
| + |
Branchlets smooth, with sparse lenticels; inflorescence loosely branched; style conspicuous |
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(52) |
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| 52 (51) |
Leaflet margin usually 12-24-toothed on each side, abaxial veinlets conspicuous. |
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16 T. venulosum |
| + |
Leaflet margin 3-8-toothed on each side, abaxial veinlets inconspicuous |
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(53) |
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| 53 (52) |
Leaves usually 3-foliolate, rarely pedately 5-foliolate; leaflets lanceolate or elliptic, apex caudate-acuminate. |
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14 T. caudatum |
| + |
Leaves usually 3-foliolate, occasionally palmately 5-foliolate; leaflets elliptic or elliptic-lanceolate, apex mucronate. |
|
15 T. erubescens |
