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| 1 |
Leaf blade abaxially punctate; pyrenes 4, 3-5 mm in diam., abaxially usually smooth, striate, not sulcate |
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(2) |
| + |
Leaf blade abaxially not punctate; pyrenes 4 or 5(or 6), 1-3 mm in diam., abaxially usually smooth, neither striate nor sulcate, rarely 1-striate, or 1-sulcate, or 3-striate and sulcate |
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(8) |
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| 2 (1) |
Branchlets usually zigzag; male cymes 1-3-flowered, rarely more flowered; pedicels equaling or slightly longer than peduncles; rudimentary ovary pyramidal. |
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38 I. triflora |
| + |
Branchlets straight; male cymes 1-7-flowered, more than 1-flowered cymes with pedicels shorter than peduncles; rudimentary ovary subglobose or conical |
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(3) |
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| 3 (2) |
Flowers 4- or 5-merous; leaf blade ovate, ovate-lanceolate, ovate-elliptic, elliptic, or ovate-oblong, (2-)3-8 × (1-)2-4 cm; male cymes 1-7-flowered, solitary on current year’s branchlets, rarely fasciculate. |
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39 I. szechwanensis |
| + |
Flowers 4-merous; leaf blade usually obovate or elliptic, rarely obovate-elliptic or oblong-elliptic, 0.5-7 × 0.4-3 cm; male cymes fasciculate on current year’s branchlets or solitary |
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(4) |
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| 4 (3) |
Leaf blade elliptic or broadly elliptic, 0.5-3 × 0.4-1.5 cm, petiole 2-4 mm |
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(5) |
| + |
Leaf blade obovate, elliptic, obovate-elliptic, or oblong-elliptic, 1-7 × 0.5-3 cm, petiole usually longer than 4 mm |
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(6) |
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| 5 (4) |
Leaf blade broadly elliptic, 0.5-1.2 × 0.4-0.9 cm, apex obtuse or acute, base rounded or obtuse, midvein adaxially obscure. |
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40 I. subcrenata |
| + |
Leaf blade elliptic, 1-3 × 0.8-1.5 cm, apex acute, cuspidate, base obtuse or broadly cuneate, midvein adaxially impressed. |
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41 I. yuana |
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| 6 (4) |
Leaf blade 1-3.5 × 0.5-1.5 cm; fruiting pedicel 4-6 mm; persistent stigma thickly discoid; pyrenes oblong-ellipsoidal, abaxially smooth, striate, not sulcate. |
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42 I. crenata |
| + |
Leaf blade 2-7 × 1-3 cm; fruiting pedicel longer than 7 mm; pyrenes abaxially convex, striate, and slightly rugose or smooth and 5-striate |
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(7) |
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| 7 (6) |
Petioles 4-6 mm, lateral veins evident on both surfaces of leaves; fruit 9-11 mm in diam., persistent stigma discoid-mammilliform; pyrenes ellipsoidal, abaxially convex, striate, and slightly rugose. |
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43 I. viridis |
| + |
Petioles 5-10 mm, lateral veins indistinct on both surfaces of leaves; fruit 7-8 mm in diam., persistent stigma thinly discoid; pyrenes ovoid-ellipsoidal, abaxially smooth, 5-striate. |
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44 I. maximowicziana |
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| 8 (1) |
Pyrenes abaxially smooth, longitudinally 1-striate; pedicel of female flower 4-4.5 cm; leaf blade 4-12.5 cm, petiole 1.5-2.5 cm. |
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45 I. pedunculosa |
| + |
Pyrenes abaxially smooth, neither striate nor sulcate, rarely 3-striate and sulcate, or 1-sulcate; pedicel of female flower 0.2-1.5 cm; leaf blade 1-5.7 cm, petiole 2-8 mm |
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(9) |
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| 9 (8) |
Pyrenes 3-striate and sulcate, or 1-sulcate |
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(10) |
| + |
Pyrenes smooth, neither striate nor sulcate |
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(11) |
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| 10 (9) |
Pyrenes 4, ellipsoidal, ca. 2 mm, ca. 1 mm in diam., abaxially longitudinally 1-sulcate; leaf blade ovate-oblong, apex long acuminate, base cuneate. |
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52 I. nanchuanensis |
| + |
Pyrenes 4 or 5, oblong, 4-5 mm, 2.5-3 mm in diam., abaxially thickly 3-striate; leaf blade elliptic-ovate, apex acute or slightly obtuse, base gradually shortly attenuate or truncate to briefly cuneate. |
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53 I. shennongjiaensis |
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| 11 (9) |
Branchlets pubescent, puberulent, glabrescent, or glabrous; leaf blade elliptic or ovate-elliptic |
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(12) |
| + |
Branchlets densely tomentose, densely villous, or densely pubescent; leaf blade ovate, ovate-lanceolate, ovate-elliptic, elliptic, oblong, oblong-lanceolate, or obovate-oblong |
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(14) |
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| 12 (11) |
Fruit 7-8 mm in diam., persistent stigma discoid; fruiting pedicel 13-15 mm. |
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48 I. sugerokii |
| + |
Fruit 4-5 mm in diam., persistent stigma mammilliform; fruiting pedicel 7-12 mm |
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(13) |
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| 13 (12) |
Leaf blade thickly leathery, elliptic, 5-5.7 × 3-3.3 cm, apex acute or shortly acuminate; fruiting pedicel ca. 7 mm, fruit ca. 5 mm in diam.. |
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46 I. reticulata |
| + |
Leaf blade subleathery, elliptic or ovate-elliptic, 3-3.5 × 2-3 cm, apex acuminate or caudate-acuminate; fruiting pedicel 8-12 mm, fruit 4-5 mm in diam.. |
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47 I. subcoriacea |
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| 14 (11) |
Leaf blade obovate-oblong or oblong, 1-3 × 0.6-1.4 cm, apex rounded or obtuse, lower half of margin entire, upper half of margin crenulate-serrate; old branchlets gray-brown or smoky pubescent; fruiting pedicel ca. 6 mm. |
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49 I. rockii |
| + |
Leaf blade ovate, ovate-elliptic, ovate-lanceolate, elliptic, oblong, or oblong-lanceolate, 2-4.5 × 1-2.5 cm, apex shortly acuminate or acute and mucronate, margin crenulate-serrate, crenate-serrate, entire, or spinulose-serrate; branchlets densely tomentose, or densely golden yellow villous, older branchlets densely ferruginous tomentose; fruiting pedicel 5-15 mm |
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(15) |
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| 15 (14) |
Branchlets, leaf blades, petioles, and fruiting pedicels densely tomentose; leaf blade ovate or ovate-elliptic, apex shortly acuminate, lateral veins 7 or 8 pairs, evident on both surfaces; fruiting pedicel 12-15 mm, nodose at middle; fruit 7-8 mm in diam.; pyrenes 5. |
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50 I. ludianensis |
| + |
Branchlets, petioles, and leaf midvein adaxially densely pubescent, villous, or tomentose; leaf blade ovate, ovate-lanceolate, oblong, oblong-lanceolate, or elliptic, apex acute and mucronate, lateral veins obscure on both surfaces; fruiting pedicel 5-15 mm, without node; fruit 5-6 mm in diam.; pyrenes 4. |
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51 I. yunnanensis |
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