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| 1 |
Margin of leaf blade entire; pyrenes abaxially 2- or 3-striate and 1- or 2-sulcate, or smooth, or 2- or 3-striate and not sulcate, or 1-sulcate |
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(2) |
| + |
Margin of leaf blade usually entire, rarely serrate, crenate, crenate-serrate, or serrulate; pyrenes abaxially usually sulcate, sometimes concave or flat |
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(7) |
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| 2 (1) |
Pyrenes abaxially smooth, or 2- or 3-striate and not sulcate, endocarp leathery. |
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32 I. excelsa |
| + |
Pyrenes 2- or 3-striate and 1- or 2-sulcate, rarely 1-sulcate (I. suichangensis), endocarp woody or subwoody |
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(3) |
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| 3 (2) |
Male flowers: peduncle 3-13 mm; calyx not ciliate |
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(4) |
| + |
Male flowers (not seen in I. suichangensis): peduncle 14-25 mm; calyx ciliate |
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(5) |
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| 4 (3) |
Leaf blade 4-9 × 1.8-4 cm. |
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33 I. rotunda |
| + |
Leaf blade 3.5-5 × 1.5-2 cm. |
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34 I. angulata |
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| 5 (3) |
Pyrenes 6-10. |
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35 I. umbellulata |
| + |
Pyrenes 5 or 6 |
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(6) |
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| 6 (5) |
Fruit ca. 10 mm in diam., pyrenes narrowly ellipsoidal, 9-10 mm, abaxially 1-sulcate; branchlets, peduncles, and pedicels glabrous. |
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36 I. suichangensis |
| + |
Fruit ca. 4 mm in diam., pyrenes ellipsoidal, 2-2.5 mm, abaxially 3-striate and 2-sulcate; branchlets, peduncles, and pedicels pubescent. |
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37 I. godajam |
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| 7 (1) |
Margin of leaf blade entire, leathery or thickly leathery, rarely thinly leathery |
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(8) |
| + |
Margin of leaf blade entire, serrate, crenate, crenate-serrate, or serrulate, leathery or subleathery, rarely papery, or papery to leathery |
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(18) |
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| 8 (7) |
Infructescence: a compound cyme, secondary axis well developed; leaf blade 9-19 × 3.5-8.5 cm. |
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2 I. maclurei |
| + |
Female inflorescence or infructescence: a simple cyme, secondary axis not developed; leaf blade (2-)3-17 × 1-8.5 cm |
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(9) |
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| 9 (8) |
Leaf blade linear-lanceolate, lanceolate, or narrowly oblong, 9-16 × 1.1-5 cm |
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(10) |
| + |
Leaf blade not above-mentioned shapes, (2-)3-17 × 1-8.5 cm |
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(11) |
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| 10 (9) |
Current year’s branchlets purple-black, glabrous; leaf blade reticulate veins adaxially obscure. |
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3 I. jiuwanshanensis |
| + |
Current year’s branchlets sulfur-colored curved pubescent; leaf blade reticulate veins adaxially evident. |
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4 I. lancilimba |
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| 11 (9) |
Fruiting pedicels 0.5-1 mm, much shorter than peduncles. |
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5 I. tugitakayamensis |
| + |
Female flowers: pedicels or fruiting pedicels 3-8 mm |
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(12) |
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| 12 (11) |
Plant densely pubescent |
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(13) |
| + |
Plant glabrous |
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(14) |
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| 13 (12) |
Leaf blade leathery, 3-11 × 1-3.2 cm. |
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6 I. dasyphylla |
| + |
Leaf blade thinly leathery, 4-11 × 2-4.5 cm. |
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7 I. lonicerifolia |
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| 14 (12) |
Peduncle 1.2-3.3 cm. |
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8 I. sterrophylla |
| + |
Peduncle shorter than 2 cm |
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(15) |
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| 15 (14) |
Fruit (6-)9-10(-12) mm in diam.. |
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9 I. editicostata |
| + |
Fruit 5-7 mm in diam |
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(16) |
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| 16 (15) |
Branchlets and petioles stout; fruit with persistent calyx not ciliate. |
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10 I. robusta |
| + |
Branchlets and petioles slender; fruit with persistent calyx ciliate |
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(17) |
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| 17 (16) |
Leaf blade midvein adaxially pubescent, reticulate veins obscure, petiole ± pubescent; pyrenes smooth when dry, abaxially shallowly sulcate. |
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11 I. litseifolia |
| + |
Leaf blade midvein adaxially glabrous, reticulate veins evident on both surfaces, petiole glabrous; pyrenes rugose when dry, abaxially deeply 1-sulcate. |
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12 I. linii |
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| 18 (7) |
Branchlets glabrous throughout, sometimes current year’s branchlets and terminal bud puberulent or glabrescent |
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(19) |
| + |
Branchlets densely pubescent, hirsute, or at least puberulent |
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(28) |
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| 19 (18) |
Leaf blade 12-18 × 4-7 cm |
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(20) |
| + |
Leaf blade 2.5-11.7 × 1-5.5 cm |
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(22) |
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| 20 (19) |
Leaf blade midvein abaxially densely yellow tomentose or glabrous. |
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13 I. atrata |
| + |
Leaf blade midvein abaxially glabrous |
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(21) |
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| 21 (20) |
Branchlets brown-yellow; leaf blade thinly leathery to papery, margin entire. |
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14 I. machilifolia |
| + |
Branchlets purple-black; leaf blade papery, margin sparsely and shallowly serrulate. |
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15 I. pseudomachilifolia |
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| 22 (19) |
Inflorescences: often cymes umbelliform, rarely 1-flowered cymes; fruiting peduncles and pedicels 1.5-2.8 cm |
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(23) |
| + |
Inflorescences: cymes usually not umbelliform; fruiting peduncles and pedicels 0.5-3.5 cm |
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(24) |
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| 23 (22) |
Leaf blade 2.5-5 × 1-2 cm. |
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16 I. huana |
| + |
Leaf blade 5-6.5(-10) × 2-2.5(-4) cm. |
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17 I. suaveolens |
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| 24 (22) |
Leaf blade broadly elliptic, similar to pear leaves, margin serrulate or serrate; pyrenes oblong, endocarp stony. |
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18 I. pyrifolia |
| + |
Leaf blade elliptic, oblong-elliptic, lanceolate, or oblong, rarely ovate, margin crenate, sometimes serrate (when young), entire, or sparsely serrulate; pyrenes with endocarp leathery, thickly leathery, or substony |
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(25) |
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| 25 (24) |
Fruit narrowly globose or subglobose; leaf blade deep brown when dry |
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(26) |
| + |
Fruit globose; leaf blade purple-brown or yellowish brown when dry |
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(27) |
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| 26 (25) |
Leaf blade glabrous throughout, rarely adaxially pilose on midvein when young. |
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19 I. chinensis |
| + |
Leaf blade of all young leaves and midvein of mature leaves adaxially puberulent. |
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20 I. pubigera |
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| 27 (25) |
Leaf blade 6-11.5 × 3-6 cm. |
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21 I. melanophylla |
| + |
Leaf blade 4-11.7 × 1.5-4.3 cm. |
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22 I. ficifolia |
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| 28 (18) |
Leaf blade oblong, obovate, lanceolate, or ovate-elliptic, 5-22 × 3.5-10 cm; inflorescences 3- or more flowered cymes; fruit 7-10 mm in diam |
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(29) |
| + |
Leaf blade ovate, ovate-elliptic, elliptic, oblong-elliptic, or elliptic-lanceolate, 2-12 × 1.5-5(-7.5) cm; female inflorescences usually 1-3-flowered, rarely 3-6-flowered cymes; fruit 5-10 mm in diam |
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(31) |
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| 29 (28) |
Leaf blade with midvein flat adaxially. |
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25 I. dehongensis |
| + |
Leaf blade with midvein impressed adaxially |
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(30) |
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| 30 (29) |
Male inflorescences with peduncles 1.5-2.8 cm. |
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24 I. latifrons |
| + |
Male inflorescences with peduncles 0.9-1.2 cm. |
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23 I. kwangtungensis |
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| 31 (28) |
Leaf blade margin sparsely serrate, undulate, or indistinctly serrulate, blade elliptic, glabrous except midvein puberulent adaxially |
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(32) |
| + |
Leaf blade margin sparsely crenate-serrate, sometimes entire or undulate-crenulate, both surfaces hairy or adaxially only midvein pubescent |
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(33) |
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| 32 (31) |
Leaf blade 9-11 × 4-5 cm. |
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26 I. cheniana |
| + |
Leaf blade 5-9 × 2.5-3.5(-7.5) cm. |
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27 I. qianlingshanensis |
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| 33 (31) |
Leaf blade leathery, ovate or ovate-elliptic, 2-7 × 1.5-3.5 cm, both surfaces ferruginous villous. |
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28 I. ferruginea |
| + |
Leaf blade papery, leathery, or thinly leathery, elliptic, oblong-elliptic, or elliptic-lanceolate, 6-12 × 2-4 cm, both surfaces densely hirsute, yellow tomentose, or rarely adaxially only on midvein |
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(34) |
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| 34 (33) |
Leaf blade 8-12 cm, margin entire. |
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29 I. manneiensis |
| + |
Leaf blade 6-9 cm, margin sparsely crenate-serrate or undulate-crenulate |
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(35) |
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| 35 (34) |
Fruiting peduncles ca. 15 mm. |
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30 I. hirsuta |
| + |
Fruiting peduncles 3-5 mm. |
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31 I. longzhouensis |
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