| 1 |
Inner tepals thin, membranous, ± open when flowering, narrowly oblong, tonguelike, or lanceolate; flower buds ovoid; pollen grains tricolpate |
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(2) |
| + |
Inner tepals fleshy to papery, only slightly open when flowering, usually ovate to suborbicular; flower buds globose; pollen grains trisyncolpate |
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(10) |
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| 2 (1) |
Leaf blade midvein adaxially prominent; flower peduncle 0.5-3 cm |
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(3) |
| + |
Leaf blade midvein adaxially impressed; flower peduncle 0.2-1 cm |
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(6) |
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| 3 (2) |
Flower peduncle 2-3 cm; style and ovary subequal in length; fruit peduncle 3-4 cm. |
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1 I. jiadifengpi |
| + |
Flower peduncle 0.5-2 cm; style distinctly longer than ovary; fruit peduncle 1.2-3.5 cm |
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(4) |
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| 4 (3) |
Leaf blade secondary veins abaxially conspicuously prominent; tepals (17-)22-33; stamens 22-25. |
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2 I. angustisepalum |
| + |
Leaf blade secondary veins abaxially flat or slightly prominent; tepals 10-21; stamens 16-23 |
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(5) |
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| 5 (4) |
Carpels 6-8(-10); fruit with 6-8(-10) follicles. |
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3 I. philippinense |
| + |
Carpels 12 or 13; fruit with (8-)12 or 13 follicles. |
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4 I. tashiroi |
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| 6 (2) |
Perules small, inconspicuous; tepals 16-19; stamens 12 or 13; fruit with 6-8 follicles. |
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5 I. tsaii |
| + |
Perules large, largest 0.4-1.5 cm; tepals 18-32; stamens 16-35; fruit with 8-13 follicles |
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(7) |
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| 7 (6) |
Largest perules 1.2-1.5 cm; leaf blade papery. |
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6 I. burmanicum |
| + |
Largest perules 0.4-1.3 cm; leaf blade leathery |
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(8) |
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| 8 (7) |
Stamens 28-35; fruit follicles 2.5-2.8 cm. |
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7 I. wardii |
| + |
Stamens 16-28; fruit follicles 1.1-2 cm |
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(9) |
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| 9 (8) |
Leaf blade 5-10 × 1.5-3.5 cm; tepals 18-23(-26), largest tepal 0.9-1.5 cm; carpels 8-13; style and ovary subequal in length. |
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8 I. simonsii |
| + |
Leaf blade 8-13(-14) × 2.5-5.5(-6.5) cm; tepals 27-32, largest tepal 1.5-2.5 cm; carpels 13 or 14; style distinctly longer than ovary. |
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9 I. macranthum |
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| 10 (1) |
Carpels 4-10(-12); fruit with 2-10 follicles |
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(11) |
| + |
Carpels (9 or)10-16; fruit with 9-14 follicles |
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(19) |
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| 11 (10) |
Style and ovary subequal in length |
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(12) |
| + |
Style distinctly longer than ovary |
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(15) |
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| 12 (11) |
Tepals greenish yellow to pale yellow; stamens 4-7. |
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24 I. oligandrum |
| + |
Tepals red to orangish red; stamens 8-19 |
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(13) |
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| 13 (12) |
Stamens 14-19; carpels 3.5-4.5 mm, with 1.8-2.5 mm style. |
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25 I. merrillianum |
| + |
Stamens 8-14; carpels 2.3-3.2 mm, with 1-1.5 mm style |
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(14) |
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| 14 (13) |
Tepals (14-)17-21; fruit follicles 0.9-1.4 cm. |
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26 I. micranthum |
| + |
Tepals 10-13; fruit follicles 1.4-1.5 cm. |
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27 I. petelotii |
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| 15 (11) |
Perules large (largest 8-12 mm) |
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(16) |
| + |
Perules small (largest to 5 mm) |
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(17) |
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| 16 (15) |
Leaf blade 0.8-1.2(-2.7) cm wide; stamens (11-)19-24(-31); carpels 2.5-3.5 mm, with 1.4-2 mm style. |
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17 I. dunnianum |
| + |
Leaf blade 1.5-4.5 cm wide; stamens 7-10; carpels 3-5.5 mm, with 2-3.8 mm style. |
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20 I. tsangii |
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| 17 (15) |
Flower peduncle 0.3-0.5 cm; fruit peduncle ca. 1 cm. |
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21 I. pachyphyllum |
| + |
Flower peduncle 1.5-5 cm; fruit peduncle 1.5-5.5 cm |
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(18) |
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| 18 (17) |
Tepals 10-15, largest 7-10 × 4-8.5 mm; seeds 6.5-7.5 mm. |
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22 I. henryi |
| + |
Tepals 7-12, largest 9-12 × 8-12 mm; seeds 7-10 mm. |
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23 I. verum |
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| 19 (10) |
Style distinctly longer than ovary |
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(20) |
| + |
Style and ovary subequal in length or style shorter than ovary |
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(23) |
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| 20 (19) |
Tepals 25 or 26. |
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16 I. griffithii |
| + |
Tepals 10-20 |
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(21) |
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| 21 (20) |
Carpels 2.5-3.5 mm; seeds 4-5 mm. |
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17 I. dunnianum |
| + |
Carpels 3.9-5.5 mm; seeds 6-8 mm |
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(22) |
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| 22 (21) |
Leaf blade with 4-7 secondary veins on each side of midvein; petiole 1.3-2.5 cm; tepals (11-)15-17(-20); stamens (14-)20-23; fruit peduncle 1-4 cm. |
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18 I. difengpi |
| + |
Leaf blade with 6-10 secondary veins on each side of midvein; petiole 0.7-1.5 cm; tepals 10-15; stamens 6-11; fruit peduncle 6-8 cm. |
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19 I. lanceolatum |
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| 23 (19) |
Stamens 14-21 |
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(24) |
| + |
Stamens 22-41 |
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(26) |
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| 24 (23) |
Perules large (largest 1-2 cm); flower peduncle 1.8-4.5(-6) cm. |
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10 I. majus |
| + |
Perules small (largest < 1 cm); flower peduncle 0.8-1.7 cm |
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(25) |
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| 25 (24) |
Leaves in clusters of 2 or 3 at distal nodes; petiole 4-7 mm; tepals ca. 19, greenish yellow; style and ovary subequal in length. |
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11 I. modestum |
| + |
Leaves in clusters of 3-5 at distal nodes; petiole 6-20 mm; tepals 9-11, pale red; style shorter than ovary. |
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12 I. brevistylum |
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| 26 (23) |
Tepals 21-23. |
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13 I. leiophyllum |
| + |
Tepals 10-21 |
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(27) |
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| 27 (26) |
Tepals 10-14; stamens 22-30. |
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14 I. ternstroemioides |
| + |
Tepals 14-21; stamens 39-41. |
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15 I. arborescens |
