| 1 |
Fruit conspicuously winged |
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(2) |
| + |
Fruit sometimes ridged but not conspicuously winged |
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(9) |
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| 2 (1) |
Shrubs; sepals and petals 4 |
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(3) |
| + |
Herbs; sepals and petals 5 |
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(4) |
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| 3 (2) |
Capsule nearly spherical, 1.8-4 cm. |
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2 Z. xanthoxylon |
| + |
Capsule narrowly ovoid to obovoid, 1-1.6 cm. |
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3 Z. kaschgaricum |
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| 4 (2) |
Leaflets 1 pair; capsule spherical, ca. 1 cm. |
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14 Z. fabagoides |
| + |
Leaflets 1-5 pairs; capsule not spherical, or if spherical larger than 1 cm |
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(5) |
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| 5 (4) |
Capsule spherical, width of wings more than 5 mm |
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(6) |
| + |
Capsule not spherical, width of wings less than 3 mm |
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(7) |
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| 6 (5) |
Leaves with 2 or 4 leaflets; leaflet blades 1-2.5 × 0.5-2 cm. |
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15 Z. potaninii |
| + |
Leaves with 6-10 leaflets; leaflet blades 0.5-1.2 × 0.2-0.8 cm. |
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16 Z. macropterum |
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| 7 (5) |
Stamens ca. 2 × as long as petals; leaflet blades ovate to rotund. |
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17 Z. iliense |
| + |
Stamens shorter than petals; leaflet blades linear, linear-oblong, or lanceolate |
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(8) |
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| 8 (7) |
Capsule lanceolate, base cuneate, apex acuminate. |
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18 Z. oxycarpum |
| + |
Capsule oblong-ovoid to ovoid, both ends obtuse. |
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19 Z. pterocarpum |
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| 9 (1) |
Fruit not more than 2 × as long as wide, indehiscent. |
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1 Z. gobicum |
| + |
Fruit more than 2 × as long as wide, dehiscent |
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(10) |
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| 10 (9) |
Leaves with more than 2 leaflets at least for majority of leaves |
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(11) |
| + |
Leaves with only 2 leaflets |
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(13) |
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| 11 (10) |
Plants prostrate to ascending; leaflet blades 1-3 mm wide. |
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13 Z. mucronatum |
| + |
Plants erect or spreading; leaflet blades 3-15 mm wide |
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(12) |
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| 12 (11) |
Perennial herbs; leaflet blades 3-5 mm wide; sepals 7-8 mm; capsule 2.5-4 cm, falcately curved. |
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11 Z. jaxarticum |
| + |
Annual or biennial herbs; leaflet blades 4-15 mm wide; sepals 5-6 mm; capsule 1.6-2.5 cm, straight or slightly curved but not falcate. |
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12 Z. loczyi |
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| 13 (10) |
Stamens shorter than petals |
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(14) |
| + |
Stamens longer than petals |
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(15) |
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| 14 (13) |
Plants 7-15 cm tall; petiole scabrous; pedicel 1-3 mm. |
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4 Z. kansuense |
| + |
Plants 30-80 cm tall; petiole not scabrous; pedicel 10-18 mm. |
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5 Z. obliquum |
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| 15 (13) |
Plants 10-20 cm tall; capsule apex acuminate. |
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10 Z. rosowii |
| + |
Plants 20-60(-100) cm tall; capsule apex not acuminate |
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(16) |
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| 16 (15) |
Capsule more than 6 mm in diam.; leaflet blades 1.5-3 cm wide |
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(17) |
| + |
Capsule less than 5 mm in diam.; leaflet blades 0.7-1 cm wide |
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(18) |
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| 17 (16) |
Capsule cylindric, both ends not slender, 0.7-1 cm in diam.; seed surface smooth, margin entire; plants 40-80 cm tall. |
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6 Z. macropodum |
| + |
Capsule oblanceolate to oblong, 1-1.5 cm in diam.; seed surface with pores, margin irregular; plants 20-25 cm tall. |
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7 Z. sinkiangense |
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| 18 (16) |
Leaflet blades oblong to oblanceolate; plants erect. |
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8 Z. brachypterum |
| + |
Leaflet blades obovate to oblong-obovate; plants spreading or prostrate. |
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9 Z. fabago |
