| 1 |
Corolla yellow, yellowish white, or white |
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(2) |
| + |
Corolla various purplish, bluish, reddish, or violet colors and usually 2-colored (rarely white in O. oxyphylla) |
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(4) |
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| 2 (1) |
Plants to 25 cm tall; leaflets 4-24 mm; beak of corolla keel 1.2-1.8 mm; legume sessile. |
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15 O. ochrantha |
| + |
Plants to 40 cm tall; beak of corolla keel 1-1.5 mm; legume substipitate or shortly stipitate |
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(3) |
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| 3 (2) |
Leaves 10-19 cm; leaflets 1-3 cm, mostly opposite but some verticillate; bracts longer than calyx; corolla yellow, keel beak ca. 1 mm. |
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16 O. ochrolongibracteata |
| + |
Leaves 5-8 cm; leaflets 0.4-0.7 cm, mostly verticillate; bracts shorter than calyx; corolla white, keel beak 1-1.5 mm. |
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17 O. qamdoensis |
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| 4 (1) |
Plants with appressed or yellowish glandular trichomes |
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(5) |
| + |
Plants non-glandular |
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(7) |
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| 5 (4) |
Beak of corolla keel (1.5-)1.8-3.8 mm; leaflets in 12-16(-50) whorls; bracts 8-15 mm. |
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12 O. myriophylla |
| + |
Beak of corolla keel 1.5-2.5 mm; leaflets in (2 or)3-12 whorls and some or most leaflets merely opposite; bracts 3-10 mm |
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(6) |
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| 6 (5) |
Calyx 0.9-1 cm; herbage non-glandular; legume stipitate. |
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13 O. trichophora |
| + |
Calyx (1-)1.2-1.7 cm; herbage with appressed yellowish or glandular trichomes; legume sessile. |
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14 O. bicolor |
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| 7 (4) |
Plants caulescent or shortly caulescent (acaulescent in some O. racemosa) |
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(8) |
| + |
Plants strictly acaulescent |
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(9) |
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| 8 (7) |
Plants shortly caulescent, stems neither diffuse nor much branched; racemes 7-10-flowered; leaves 5-14 cm, with 6-13 whorls of 4-6 leaflets. |
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21 O. racemosa |
| + |
Plants definitely caulescent, stems diffuse and often much branched; racemes 1-3-flowered; leaves 3-5 cm, with 2-5 whorls of 3 or 4 leaflets. |
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23 O. ramosissima |
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| 9 (7) |
Plants (1.5-)2-6 cm tall; leaves (0.5-)1-5 cm; racemes 1-3-flowered |
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(10) |
| + |
Plants (3-)5-20(-40) cm tall; leaves (2.5-)3-20(-30) cm; racemes 5-15-flowered or more (few flowered in O. shanxiensis) |
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(11) |
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| 10 (9) |
Leaves (0.5-)1-3 cm, with 6-12 whorls of 4-6 leaflets; corolla standard 1.4-2.2 cm, keel beak 0.5-1.1 mm; plants turf- or cushion-forming. |
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22 O. chionobia |
| + |
Leaves 3-5 cm, with 2-4 whorls of 3 or 4 leaflets; corolla standard 2.1-3.2 cm, keel beak ca. 2 mm; plants caespitose. |
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24 O. langshanica |
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| 11 (9) |
Leaves of 3 kinds, i.e., with a solitary leaflet, with 7-15 opposite leaflets, and with 3 or 4 whorls of 3 or 4 leaflets each; corolla standard 1.5-1.6 cm. |
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10 O. shanxiensis |
| + |
Leaves with leaflets in (1-)3-18 whorls or some leaves with leaflets in whorls and others opposite or alternate (if with 3 kinds as above, then plants not from Shandong or Shanxi); corolla standard 1.4-2.5(-3) cm |
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(12) |
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| 12 (11) |
Leaflets in (7-)12-18 whorls; corolla standard (1.4-)1.5-2.5(-3) cm |
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(13) |
| + |
Leaflets in (1-)3-10 whorls (or not verticillate for some leaves); corolla standard 1.4-1.8(-2.3) cm |
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(15) |
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| 13 (12) |
Corolla standard 2.5-3 cm; legume body 2-2.5 cm. |
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18 O. przewalskii |
| + |
Corolla standard 2-2.5 cm; legume body 1-1.6 cm |
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(14) |
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| 14 (13) |
Plants 5-8 cm tall; leaves 5-7 cm; calyx lobes ca. 2 mm. |
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11 O. lanata |
| + |
Plants 11-40 cm tall; leaves (5-)10-30 cm; calyx lobes 3.5-4.5 mm. |
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12 O. myriophylla |
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| 15 (12) |
Calyx (1-)1.2-1.7 cm, lobes (2-)3.5-7 mm; corolla standard 1.4-2.3 cm. |
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14 O. bicolor |
| + |
Calyx 0.6-1 cm, lobes 1-3.5 mm; corolla standard 1.4-1.8 cm |
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(16) |
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| 16 (15) |
Leaves 3-6 cm; leaflets in 4 or 5 whorls; peduncle 3-5 cm; calyx 8-10 mm. |
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19 O. pumila |
| + |
Leaves 7-20(-25) cm; leaflets in (1-)3-9 whorls; peduncle 6-11(-19) cm; calyx 6-8.3(-10) mm. |
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20 O. oxyphylla |
