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| 1 |
Flowers and fruit 4-merous only |
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(2) |
| + |
Flowers and fruit usually 5-merous, sometimes combined with 4-merous |
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(8) |
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| 2 (1) |
Leaf blade entire, narrowly lanceolate. |
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7 E. kweichowensis |
| + |
Leaf blade crenulate to denticulate, ovate to elliptic, widest at mid-blade |
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(3) |
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| 3 (2) |
Leaves sessile; leaf blade ovate-oblong, base cordate, margin large serrate. |
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14 E. subcordatus |
| + |
Leaves petiolate; leaf blade base not cordate, margin not serrate |
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(4) |
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| 4 (3) |
Flowers red to purple |
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(5) |
| + |
Flowers green to yellow |
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(6) |
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| 5 (4) |
Wings of capsule short, less than 6 mm, obtuse at apex. |
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5 E. frigidus |
| + |
Wings of capsule long, more than 6 mm, sharp at apex. |
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6 E. giraldii |
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| 6 (4) |
Wings of capsule obtuse at apex. |
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13 E. schensianus |
| + |
Wings of capsule sharp at apex |
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(7) |
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| 7 (6) |
Leaf blade ovate or obovate, 9-14 × 4-6 cm. |
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8 E. macropterus |
| + |
Leaf blade ovate-elliptic, 6-8 × 3-4 cm. |
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12 E. sanguineus |
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| 8 (1) |
Capsule nearly without wing, subglobose, or with small angles at connection of locules. |
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9 E. oxyphyllus |
| + |
Capsule always with long and evident wings |
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(9) |
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| 9 (8) |
Leaf blade linear or oblong, bamboolike, entire length of equal width. |
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2 E. cornutus |
| + |
Leaf blade ovate, elliptic, or lanceolate, widest at mid-blade |
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(10) |
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| 10 (9) |
Leaf margin entire |
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(11) |
| + |
Leaf margin crenulate to serrate |
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(12) |
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| 11 (10) |
Leaf blade broadly elliptic, ovate, or ovate-elliptic, 9-13 × 4-6 cm; capsule ca. 1.5 cm in diam., with obscure wings. |
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3 E. ficoides |
| + |
Leaf blade elliptic-ovate or obovate-elliptic, 6-9 × 2.5-4 cm; capsule 1.2-1.4 cm in diam., with wings less than 5 mm. |
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10 E. rehderianus |
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| 12 (10) |
Flowers white, yellow, or greenish; capsule 4-winged, wings up to 1 cm, sometimes combined with 5-winged fruit. |
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4 E. fimbriatus |
| + |
Flowers pink, red to purple; capsule usually 5-winged |
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(13) |
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| 13 (12) |
Leaf blade ovate-lanceolate, more than 5 × as long as wide. |
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1 E. clivicola |
| + |
Leaf blade ovate to elliptic, less than 3 × as long as wide |
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(14) |
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| 14 (13) |
Flowers large, up to 1.2 cm in diam.; capsule with 5 wings developing. |
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15 E. szechuanensis |
| + |
Flowers small, 7-9 mm in diam.; capsule usually with 5 wings developing, sometimes only 3 or 4 wings developing. |
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11 E. sachalinensis |
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