| 1 |
Stamens 4-6 |
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(2) |
| + |
Stamens 3 |
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(8) |
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| 2 (1) |
Branchlets and leaf blade glabrous |
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(3) |
| + |
Branchlets and leaf blade densely pubescent or tomentose |
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(5) |
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| 3 (2) |
Leaf blade apex acuminate to caudate-acuminate, adaxially glaucous; stamens 4; sepals sparsely pubescent; style column long cylindric. |
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1 G. lanceolatum |
| + |
Leaf blade apex acute, obtuse, or rounded, adaxially green to dark green; stamens 5 or 6; sepals glabrous; style column ovoid or conical |
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(4) |
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| 4 (3) |
Leaf blade base acute or broadly cuneate; flowers in axillary clusters; male sepals obovate or oblong-obovate; ovary densely pubescent. |
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2 G. lanceolarium |
| + |
Leaf blade base shallowly cordate, truncate, or rounded; flowers in supra-axillary cymes or umbels; male sepals ovate or broadly ovate; ovary glabrous. |
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3 G. zeylanicum |
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| 5 (2) |
Flowers in axillary clusters |
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(6) |
| + |
Flowers usually in supra-axillary cymes |
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(7) |
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| 6 (5) |
Leaf blade base symmetrical, both surfaces glabrous to sparsely pubescent only on veins, lateral veins prominent; ovary 10-locular. |
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4 G. coccineum |
| + |
Leaf blade base asymmetrical, adaxially glabrous, abaxially pubescent, lateral veins obscure; ovary 4- or 5-locular. |
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5 G. oblatum |
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| 7 (5) |
Male sepals ca. 1 mm; female pedicels to 7 mm; capsules to 8.5 mm in diam., puberulent. |
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6 G. arborescens |
| + |
Male sepals 3-4 mm; female pedicels to 3 mm; capsules to 12 mm in diam., strongly pubescent. |
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7 G. hirsutum |
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| 8 (1) |
Leaf blade hairy at least on veins |
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(9) |
| + |
Leaf blade glabrous |
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(16) |
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| 9 (8) |
Leaf blade base asymmetrical |
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(10) |
| + |
Leaf blade base symmetrical |
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(13) |
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| 10 (9) |
Sepals 6, ovary pubescent |
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(11) |
| + |
Sepals 5, ovary glabrous |
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(12) |
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| 11 (10) |
Leaf blade abaxially puberulent only on veins; sepals abaxially glabrous. |
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8 G. rubrum |
| + |
Leaf blade abaxially white pubescent; sepals abaxially pubescent. |
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9 G. triandrum |
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| 12 (10) |
Leaf blade with only midvein and lateral veins pubescent abaxially; male pedicels, sepals outside, and capsules glabrous. |
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10 G. medogense |
| + |
Leaf blade sparsely pubescent on both surfaces; male pedicels, sepals outside, and capsules pubescent. |
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11 G. nubigenum |
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| 13 (9) |
Leaves and capsules spreading villous, leaf blade base obtuse, truncate to rounded; style column ca. 3 × as long as ovary. |
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12 G. eriocarpum |
| + |
Leaves and capsules pubescent or tomentose; leaf blade base cuneate, acute, or obtuse; style column not longer than ovary |
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(14) |
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| 14 (13) |
Sepals adaxially pubescent; style column shorter than ovary. |
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13 G. heyneanum |
| + |
Sepals adaxially glabrous; style column as long as ovary |
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(15) |
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| 15 (14) |
Trees; leaf blade 3-7 cm wide; male sepals elliptic, female sepals ovate; style column cylindric or subconical. |
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14 G. lutescens |
| + |
Shrubs; leaf blade 1-2.5 cm wide; male and female sepals narrowly oblong or oblong-obovate; styles connate into an annulus. |
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15 G. puberum |
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| 16 (8) |
Leaf blade base asymmetrical |
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(17) |
| + |
Leaf blade base symmetrical |
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(22) |
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| 17 (16) |
Outer male sepals larger than inner |
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(18) |
| + |
Outer male sepals as large as inner |
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(19) |
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| 18 (17) |
Leaf blade oblong or obovate; male pedicels sparsely strongly hispid; anthers linear. |
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16 G. chademenosocarpum |
| + |
Leaf blade lanceolate; male pedicels glabrous; anthers not linear. |
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17 G. kusukusense |
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| 19 (17) |
Young branches, ovary, and capsules pubescent. |
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18 G. philippicum |
| + |
Young branches, ovary, and capsules glabrous |
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(20) |
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| 20 (19) |
Leaf blade abaxially greenish, gray-brown when dry; style column depressed globose, ca. 2 mm wide, ca. 2 × wider than ovary. |
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19 G. sphaerogynum |
| + |
Leaf blade abaxially white powdery to green, not gray-brown when dry; style column obovoid or cylindric, less than ca. 1 mm wide, not wider than ovary |
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(21) |
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| 21 (20) |
Leaf blade abaxially green-gray when dry; lateral veins reddish; male sepals elliptic; style column obovate; capsule 10-15 mm in diam.. |
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20 G. thomsonii |
| + |
Leaf blade abaxially glaucous when dry; lateral veins not reddish; male sepals oblong; style column cylindric; capsule 6-8 mm in diam.. |
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21 G. wrightii |
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| 22 (16) |
Male pedicels 13-20 mm, pubescent. |
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22 G. ellipticum |
| + |
Male pedicels less than 9 mm, glabrous |
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(23) |
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| 23 (22) |
Branchlets angular; petiole pubescent; leaf blade abaxially gray-glaucous |
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(24) |
| + |
Branchlets terete; petiole glabrous; leaf blade abaxially not gray-glaucous |
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(25) |
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| 24 (23) |
Midrib of leaf not raised adaxially; ovary puberulent when young; style column clavate. |
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23 G. daltonii |
| + |
Midrib of leaf raised adaxially; ovary glabrous; style column cylindric. |
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24 G. wilsonii |
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| 25 (23) |
Branches pubescent; leaf blade obovate or oblong-obovate; outer sepals equaling inner ones. |
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25 G. obovatum |
| + |
Branches glabrous; leaf blade usually ovate, elliptic, or oblong; outer sepals larger than inner ones |
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(26) |
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| 26 (25) |
Leaf apex caudate-acuminate; male sepals broadly ovate; ovary 5- or 6-locular; style column cylindric. |
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26 G. ramiflorum |
| + |
Leaf apex acuminate to acute; male sepals obovate or oblong-obovate; ovary 3- or 4-locular; style column obconical or subclavate |
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(27) |
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| 27 (26) |
Leaf blade ovate, obovate, or oblong, apex acute; sepal margins minutely serrate or entire; style column obconical. |
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27 G. suishaense |
| + |
Leaf blade oblong or ovate-lanceolate, apex acuminate; sepal margins entire; style column subclavate, apex unequally 3-toothed. |
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28 G. khasicum |
