| 1 |
Ovary and drupe globose, not lobed; drupelets 1 or 2 per fruit |
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(2) |
| + |
Ovary and drupe obviously 2-4-lobed, lobes ± globose, each with 1 drupelet |
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(6) |
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| 2 (1) |
Climbing lianas; leaf blade oblong or lanceolate, base cordate, abaxially subglabrous. |
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5 G. kwangtungensis |
| + |
Erect shrubs or trees; leaf blade broadly ovate-orbicular to ovate-oblong, base oblique or symmetrically rounded, abaxially tomentose, rarely glabrous |
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(3) |
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| 3 (2) |
Leaf blade base oblique |
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(4) |
| + |
Leaf blade base symmetrical, rounded |
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(5) |
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| 4 (3) |
Leaf blade abaxially densely softly stellate tomentose; cymes in clusters of 1-3. |
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1 G. eriocarpa |
| + |
Leaf blade abaxially sparsely pilose or subglabrous; cymes in clusters of 2-6. |
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4 G. tiliifolia |
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| 5 (3) |
Petiole 5-10 mm, leaf blade broadly ovate, 4.5-6 cm wide; drupe 6-8 mm in diam. |
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2 G. celtidifolia |
| + |
Petiole 3-4 mm, leaf blade nearly orbicular, 7.5-10 cm wide; drupe 4-5 mm in diam. |
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3 G. yinkiangensis |
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| 6 (1) |
Leaf blade ovate, rhomboid, suborbicular, or obovate-elliptic, base oblique or symmetrical, lateral basal veins ascending beyond middle of blade |
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(7) |
| + |
Leaf blade lanceolate or oblong, base always symmetrical, lateral basal veins reaching mid leaf only |
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(16) |
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| 7 (6) |
Leaf blade abaxially glabrescent or sparsely pilose, never tomentose |
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(8) |
| + |
Leaf blade abaxially tomentose, coarsely hairy or pilose |
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(10) |
| |
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| 8 (7) |
Leaf blade margin serrulate, leaf blade elliptic to obovate-elliptic or suborbicular. |
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7 G. biloba |
| + |
Leaf blade margin serrate or irregularly serrate, leaf blade rhomboid, ovate, or elliptic |
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(9) |
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| 9 (8) |
Leaf blade 2-4.5 cm wide, rhomboid or ovate; branchlets rust-brown stellate tomentose. |
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6 G. rhombifolia |
| + |
Leaf blade 1-2 cm wide, ovate or elliptic; branchlets sparsely stellate hairy. |
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8 G. piscatorum |
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| 10 (7) |
Leaf blade adaxially glabrous or softly hairy |
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(11) |
| + |
Leaf blade adaxially coarsely hairy |
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(12) |
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| 11 (10) |
Leaf blade elliptic or ovate-elliptic, margin crenate, branchlets softly yellow tomentose. |
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9 G. angustisepala |
| + |
Leaf blade oblong-lanceolate, margin denticulate; branchlets glabrescent. |
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27 G. multiflora |
| |
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| 12 (10) |
Leaf blade longer than 10 cm, base regular |
|
(13) |
| + |
Leaf blade shorter than 10 cm, base regular or oblique |
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(14) |
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| 13 (12) |
Erect shrubs or small trees; leaf blade 21-28 cm. |
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10 G. permagna |
| + |
Climbing shrubs; leaf blade 8-13 cm. |
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11 G. acuminata |
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| 14 (12) |
Leaf blade ovate-orbicular or elliptic, 2-3 cm wide. |
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7 G. biloba |
| + |
Leaf orbicular or broadly ovate-orbicular, 4-9 cm wide |
|
(15) |
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| 15 (14) |
Cymes many per axil; peduncle 3-6 mm; stigma 2-lobed. |
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12 G. abutilifolia |
| + |
Cymes 1 or 2 per axil; peduncle ca. 10 mm; stigma 5-lobed. |
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13 G. urenifolia |
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| 16 (6) |
Old leaves abaxially subglabrous or sparsely hairy on veins, adaxially hairy only in vein axils at most |
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(17) |
| + |
Old leaves abaxially tomentose or rough-hairy, adaxially hairy |
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(18) |
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| 17 (16) |
Leaf blade leathery; peduncle robust, with long hairs; petals 2.5-3 mm. |
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14 G. concolor |
| + |
Leaf blade thinly leathery; peduncle slender, with short hairs; petals 4-5 mm. |
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15 G. macropetala |
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| 18 (16) |
Leaf blade broadly oblong, base broadly cuneate or obtuse on one side; petiole 7-9 mm. |
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25 G. henryi |
| + |
Leaf blade lanceolate, oblong-lanceolate, triangular-lanceolate, or band-shaped, base rounded or slightly cordate, rarely obtuse; petiole 1-8 mm |
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(19) |
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| 19 (18) |
Leaf blade triangular-lanceolate, base wide. |
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16 G. sessiliflora |
| + |
Leaf blade lanceolate, oblong-lanceolate, or band-shaped, base rounded and narrow |
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(20) |
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| 20 (19) |
Teeth on leaf blade margin irregular in size, leaf blade leathery, densely tomentose. |
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24 G. cuspidatoserrata |
| + |
Teeth on leaf blade margin regular and similar in size, leaf blade papery or leathery, glabrous or sparsely to densely hairy |
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(21) |
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| 21 (20) |
Leaf blade band-shaped, 13-20 × 1-3 cm |
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(22) |
| + |
Leaf blade lanceolate or oblong-lanceolate, 4-14 × 2-4 cm |
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(23) |
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| 22 (21) |
Cymes 1-3 per axil; stamens 20-30; leaf veinlets adaxially obscure. |
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23 G. falcata |
| + |
Cymes 2 to several per axil; stamens 10-20; leaf veinlets adaxially prominent. |
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26 G. lacei |
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| 23 (21) |
Leaf blade abaxially gray-white appressed stellate pilose. |
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22 G. retusifolia |
| + |
Leaf blade abaxially yellow-brown or gray-brown tomentose or coarsely hairy |
|
(24) |
| |
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| 24 (23) |
Leaf blade abaxially stellate pilose |
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(25) |
| + |
Leaf blade abaxially thickly and softly or coarsely tomentose |
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(26) |
| |
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| 25 (24) |
Leaf blade abaxially sparsely yellow stellate pilose. |
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21 G. brachypoda |
| + |
Leaf blade abaxially densely white stellate pilose. |
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20 G. latiglandulosa |
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| 26 (24) |
Leaf blade coarsely yellow-brown tomentose; petiole 2-3 mm |
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19 G. hirsuta |
| + |
Leaf blade softly gray-brown tomentose; petiole 3-8 mm |
|
(27) |
| |
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| 27 (26) |
Leaf blade leathery; petiole 3-5 mm. |
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17 G. chuniana |
| + |
Leaf blade papery; petiole 5-8 mm. |
|
18 G. oligandra |
