| 1 |
Leaves 1-foliolate. |
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18 O. sect. Neimonggolicae (p. 498) |
| + |
Leaves 3- to many foliolate |
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(2) |
| |
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| 2 (1) |
Leaflets verticillate or both verticillate and opposite |
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(3) |
| + |
Leaflets opposite on rachis, or sometimes alternate or subopposite, not verticillate |
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(4) |
| |
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| 3 (2) |
Plants with glands; leaflets verticillate. |
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3 O. sect. Polyadena (p. 462) |
| + |
Plants without glands; leaflets verticillate and opposite. |
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4 O. sect. Baicalia (p. 464) |
| |
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| 4 (2) |
Plants with glands |
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(5) |
| + |
Plants without glands |
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(6) |
| |
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| 5 (4) |
Plants with conspicuous persistent stramineous petioles clothing caudex apices. |
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5 O. sect. Leucopodia (p. 468) |
| + |
Plants lacking persistent petioles at caudex apices. |
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6 O. sect. Falcicarpae (p. 469) |
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| 6 (4) |
Plants caulescent, with conspicuous internodes |
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(7) |
| + |
Plants acaulescent, without conspicuous internodes or only exceptionally caulescent |
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(10) |
| |
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|
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| 7 (6) |
Corolla standard lamina usually orbicular, not contracted in middle, not widened at basal half, and without auricles. |
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7 O. sect. Mesogaea (p. 469) |
| + |
Corolla standard lamina spatulate, oblong, or ovate-triangular |
|
(8) |
| |
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| 8 (7) |
Corolla standard lamina spatulate, base tapering, middle contracted hence becoming 3-lobed. |
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8 O. sect. Dolichanthos (p. 479) |
| + |
Corolla standard lamina oblong or ovate-triangular, base widened or tapering into 2 auricles |
|
(9) |
| |
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| 9 (8) |
Corolla standard lamina oblong, widened in basal half, base widened and without auricles, apex emarginate. |
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9 O. sect. Sichuanicae (p. 479) |
| + |
Corolla standard lamina ovate-triangular, base auriculate, apex obliquely cuneate. |
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10 O. sect. Auriculatae (p. 480) |
| |
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| 10 (6) |
Plants hirsute with spreading coarse long straight rigid trichomes; leaves 10-15 cm, with leaflets 1-5 cm. |
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11 O. sect. Brachytropis (p. 480) |
| + |
Plants glabrous, with spreading trichomes, or densely pubescent but not hirsute; leaves never 10-15 cm with leaflets to 5 cm |
|
(11) |
| |
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| 11 (10) |
Corolla standard and keel pubescent on outer surface. |
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16 O. sect. Sericopetalae (p. 495) |
| + |
Corolla standard and keel not pubescent on any surface |
|
(12) |
| |
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|
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| 12 (11) |
Plants glabrous or with spreading trichomes; leaflet blades whitish green |
|
(13) |
| + |
Plants densely pubescent; leaflet blades yellowish gray or whitish gray |
|
(14) |
| |
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|
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| 13 (12) |
Legume membranous; peduncle ± as long as leaves. |
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12 O. sect. Xerobia (p. 480) |
| + |
Legume scarious; peduncle much longer than leaves. |
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13 O. sect. Eumorpha (p. 486) |
| |
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| 14 (12) |
Plants covered with whitish gray trichomes; leaflet blades whitish gray. |
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17 O. sect. Orobia (p. 496) |
| + |
Plants with yellowish gray or yellowish brown trichomes; leaflet blades yellowish gray or yellowish brown |
|
(15) |
| |
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| 15 (14) |
Peduncle 1.5-9 cm. |
|
14 O. sect. Janthina (p. 491) |
| + |
Peduncle 2-38 cm. |
|
15 O. sect. Oxytropis (p. 493) |
