| 1 |
Inflorescence a 1-flowered scape; upper sepal navicular, petaline limb very small, lip and spur indistinct; carpels 6--8 |
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22 A. fletcheranum |
| + |
Inflorescence usually racemose, many flowered; upper sepal cylindric or high galeate; petals with distinct lip and spur; carpels 3. |
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(2) |
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| 2 (1) |
Stem twining. |
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(3) |
| + |
Stem erect. |
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(4) |
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| 3 (2) |
Inflorescence rachis retrorse and appressed pubescent |
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11 A. finetianum |
| + |
Inflorescence rachis spreading pubescent |
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12 A. alboviolaceum |
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| 4 (2) |
Upper sepal high galeate or subcylindric, 6--10 mm high, broader than high. |
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(5) |
| + |
Upper sepal cylindric, more than 13 mm high, higher than broad. |
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(7) |
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| 5 (4) |
Stem retrorse and spreading hispid, to 65 cm tall, ca. 4 mm in diam.; sepals blue-purple, upper sepal subcylindric |
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1 A. chrysotrichum |
| + |
Stem retrorse pubescent or subglabrous, 100--200 cm tall, more than 8 mm in diam.; upper sepal galeate or high galeate. |
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(6) |
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| 6 (5) |
Stem to 200 cm tall, ca. 1.5 cm in diam.; leaf blade to 25 cm wide; petals not spurred; sepals yellowish or white |
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3 A. apetalum |
| + |
Stem to 100 cm tall, ca. 1 cm in diam.; leaf blade to 10 cm wide; petals shortly spurred; sepals pale purple |
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2 A. novoluridum |
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| 7 (4) |
Leaf blade ternate |
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21 A. barbatum |
| + |
Leaf blade deeply to medially 3-lobed. |
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(8) |
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| 8 (7) |
Stem scapose to subscapose; pedicel with 2 bracteoles at base. |
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(9) |
| + |
Stem leafy; pedicel with 2 bracteoles above base. |
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(14) |
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| 9 (8) |
Pedicels (except lowermost pedicels of inflorescence) 1.5--7 mm. |
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(10) |
| + |
Pedicels of basal part of inflorescence 5--20 mm or longer. |
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(11) |
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| 10 (9) |
Upper sepal 1.3--1.5 cm high; petaline spur ca. 1 mm |
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4 A. brevicalcaratum |
| + |
Upper sepal ca. 1.1 cm high; petaline spur ca. 4 mm |
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5 A. kialaense |
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| 11 (9) |
Distal pedicels 5--12 mm; bracteoles linear; petaline spur nearly equal to lip in length. |
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(12) |
| + |
Distal pedicels 14--20 mm; bracteoles narrowly ovate; petaline spur 2--3 × longer than lip. |
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(13) |
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| 12 (11) |
Pedicels spreading pubescent; flowers dark purplish blue to violet or pink, sometimes yellowish white; petaline spur circinate |
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8 A. crassiflorum |
| + |
Pedicels appressed pubescent; flowers dull yellow; petaline spur gently incurved |
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9 A. rilongense |
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| 13 (11) |
Pedicels appressed pubescent; leaf blade 3-parted nearly to base |
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7 A. cavaleriei |
| + |
Pedicels spreading pubescent; leaf blade 3-parted to or slightly beyond middle |
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6 A. scaposum |
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| 14 (8) |
Lower pedicels less than 1 cm |
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10 A. longecassidatum |
| + |
Lower pedicels more than 1.2 cm. |
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(15) |
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| 15 (14) |
Sepals yellow. |
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(16) |
| + |
Sepals blue-purple. |
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(19) |
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| 16 (15) |
Inflorescence spreading pubescent |
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17 A. monticola |
| + |
Inflorescence appressed pubescent. |
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(17) |
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| 17 (16) |
Stem sparsely retrorse pubescent basally; petaline spur subspirally incurved or circinate |
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18 A. umbrosum |
| + |
Stem and petioles spreading pubescent, sometimes with intermixed retrorse hairs; petaline spur erect, slightly curved or spirally curved. |
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(18) |
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| 18 (17) |
Upper sepal 1--1.3 cm high; petaline spur spirally incurved |
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19 A. ranunculoides |
| + |
Upper sepal 1.5--2 cm high; petaline spur erect or slightly incurved |
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20 A. kirinense |
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| 19 (15) |
Inflorescence usually retrorse and appressed pubescent |
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14 A. sinomontanum |
| + |
Inflorescence spreading pubescent. |
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(20) |
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| 20 (19) |
Leaf blade abaxially with straight hairs, hairs 0.8--1.2 mm |
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16 A. septentrionale |
| + |
Leaf blade abaxially with slightly crisped hairs, hairs 0.2--0.5 mm. |
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(21) |
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| 21 (20) |
Leaf lobes shallowly divided, acute or shortly acuminate at apex, ultimate lobules triangular, acute at apex |
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13 A. wardii |
| + |
Leaf lobes deeply divided, long acuminate at apex, ultimate lobules narrowly triangular, sharp at apex |
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15 A. leucostomum |
