| 1 |
Rachis scales black or dark brown, linear or subulate |
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(2) |
| + |
Rachis scales brown or reddish brown, of various shapes |
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(14) |
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| 2 (1) |
Lamina 1-pinnate; pinnae not dissected or only shallowly dissected and with 1 or 2 free lobes at base |
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(3) |
| + |
Lamina bipinnate, bipinnatipartite, or rarely tripinnate |
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(5) |
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| 3 (2) |
Pinnae narrowly ovate or ovate, those of middle of lamina shorter than 2 cm. |
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2 P. otophorum |
| + |
Pinnae linear-lanceolate, those of middle of lamina longer than 3 cm |
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(4) |
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| 4 (3) |
Lamina green; pinnae shallowly toothed, basiscopic bases obliquely truncate; indusia bicolorous (blackish at center and light brown on margin). |
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3 P. xiphophyllum |
| + |
Lamina yellowish green; pinnae entire, basiscopic bases rounded; indusia concolorous (brown). |
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4 P. revolutum |
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| 5 (2) |
Pinnae pinnatipartite, with 0-2 free lobes at base |
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(6) |
| + |
Pinnae with many free lobes at base |
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(7) |
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| 6 (5) |
Lamina narrowly ovate or broadly lanceolate; pinnae 16-25 pairs. |
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5 P. langchungense |
| + |
Lamina narrowly lanceolate; pinnae 25-32 pairs. |
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6 P. diffundens |
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| 7 (5) |
Lamina tripinnate; pinnules deeply dissected. |
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7 P. incisopinnulum |
| + |
Lamina bipinnate; pinnules often not dissected |
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(8) |
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| 8 (7) |
Pinnules obviously auriculate; pinnules denticulate and spinulose on margin |
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(9) |
| + |
Except for basalmost acroscopic pinnule, pinnules exauriculate; pinnules often entire |
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(11) |
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| 9 (8) |
Lamina leathery; rachis scales narrowly lanceolate. |
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14 P. mayebarae |
| + |
Lamina thinly leathery; rachis scales linear, broadened and ciliate at base |
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(10) |
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| 10 (9) |
Pinnules lanceolate or narrowly elliptic, distant from each other. |
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12 P. herbaceum |
| + |
Pinnules oblong, ovate, or deltoid, approximate. |
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13 P. tsus-simense |
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| 11 (8) |
Pinnules obliquely oblong or ovate, those of lower part of lamina 8-18 mm |
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(12) |
| + |
Pinnules obliquely broadly ovate or broadly obovate, those of lower part of lamina 4-8 mm |
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(13) |
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| 12 (11) |
Lamina shorter than 30 cm; rachis scales brown. |
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8 P. pseudosetosum |
| + |
Lamina up to 37 cm; rachis scales dark brown. |
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9 P. exauriforme |
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| 13 (11) |
Lamina shorter than 20 cm; pinnae shortly acute. |
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10 P. sinotsus-simense |
| + |
Lamina up to 50 cm; pinnae caudate or long acuminate. |
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11 P. pseudoxiphophyllum |
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| 14 (1) |
Lamina 1-pinnate, linear-lanceolate, 1.8-2.5 cm wide, ratio of length to width larger than 5; pinnae not dissected or shallowly dissected, rarely deeply dissected; lobes fewer than 4 pairs |
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(15) |
| + |
Lamina bipinnatifid to bipinnate, elliptic or broadly lanceolate, broader than (5-)6 cm, ratio of length to width smaller than 4; pinnae with 4-15 pairs of lobes or pinnules |
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(22) |
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| 15 (14) |
Pinnae rhombic-ovate, not dissected (sometimes with 1 lobe at base). |
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15 P. delavayi |
| + |
Primary pinnae pinnatifid, at least basiscopic bases with 1 lobe |
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(16) |
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| 16 (15) |
Lamina linear-lanceolate; pinnae of lower part of lamina with 1 or 2 lobes |
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(17) |
| + |
Lamina lanceolate or deltoid-lanceolate; primary pinnae pinnatifid or pinnate |
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(19) |
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| 17 (16) |
Pinnae acute to acuminate into a spine. |
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16 P. stimulans |
| + |
Pinnae obtuse or nearly rounded and with a spine at apex |
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(18) |
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| 18 (17) |
Lamina leathery, subglabrous adaxially. |
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17 P. rhomboideum |
| + |
Lamina thinly leathery, with fibrillose microscales adaxially. |
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18 P. adungense |
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| 19 (16) |
Lobes or pinnules entire or with forward-pointing small teeth |
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(20) |
| + |
At least lobes or pinnules of lower part of pinnae with open spinulose teeth |
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(21) |
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| 20 (19) |
Widest part of lamina located at base or below middle; rachis scales filiform. |
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19 P. cyclolobum |
| + |
Widest part of lamina located at middle; rachis scales not filiform. |
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20 P. mehrae |
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| 21 (19) |
Pinnae spreading, approximate, basal acroscopic pinnules broadly ovate or rhombic-ovate. |
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21 P. acanthophyllum |
| + |
Pinnae ascending, distant from each other, basal acroscopic pinnules ovate or narrowly ovate. |
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22 P. meiguense |
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| 22 (14) |
Primary pinnae not dissected to pinna rachis. |
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23 P. rigens |
| + |
Primary pinnae pinnate |
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(23) |
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| 23 (22) |
Pinnules of lower part of pinnae with obvious deltoid auricles |
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(24) |
| + |
Pinnules without auricles |
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(26) |
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| 24 (23) |
Basalmost acroscopic pinnules unusually large, pinnatifid; lateral veins concave abaxially. |
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24 P. baoxingense |
| + |
Basalmost acroscopic pinnules often not dissected or partially dissected at most; lateral veins not concave or slightly raised abaxially |
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(25) |
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| 25 (24) |
Lamina longer than 40 cm; stipe and rachis scales brown or reddish brown. |
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25 P. squarrosum |
| + |
Lamina shorter than 30 cm; stipe and rachis scales brown, reddish brown, or dark brown. |
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26 P. orientalitibeticum |
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| 26 (23) |
Pinnules of middle pinnae rhombic or broadly lanceolate |
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(27) |
| + |
Pinnules of middle pinnae broadly ovate, obliquely oblong, or rhombic-ovate |
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(29) |
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| 27 (26) |
Rachis scales ovate-lanceolate, not twisted. |
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27 P. latilepis |
| + |
Rachis scales subulate to narrowly lanceolate, twisted |
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(28) |
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| 28 (27) |
Pinnules broadly lanceolate, with long sharp teeth. |
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28 P. neolobatum |
| + |
Pinnules rhombic, with short sharp teeth. |
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29 P. yigongense |
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| 29 (26) |
Pinnules entire or with few small teeth. |
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30 P. integrilimbum |
| + |
Pinnules obviously sharply spinulose |
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(30) |
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| 30 (29) |
Lamina 25-60 cm; pinnules obliquely broadly ovate, most pinnules without open, long, sharp teeth. |
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31 P. garhwalicum |
| + |
Lamina 20-40 cm; pinnules rhombic, all pinnules with open, long, sharp teeth. |
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32 P. rhombiforme |
