1 |
Lip subglobose, ellipsoid, or ovoid, apical margin involute, usually with a rather short basal claw |
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(2) |
+ |
Lip helmet-shaped or slipper-shaped, lacking an involute apical margin and with a long basal claw |
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(10) |
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2 (1) |
Lip usually ellipsoid or ovoid, longer than broad; dorsal sepal broader than petals |
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(3) |
+ |
Lip usually subglobose, nearly as long as broad; dorsal sepal narrower than or ca. as broad as petals |
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(5) |
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3 (2) |
Dorsal sepal and petals with a central longitudinal stripe composed of brown-red spots; staminode with caudate apex 1.5-2 mm. |
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9 P. wenshanense |
+ |
Dorsal sepal and petals without a central stripe as above; staminode lacking a caudate apex as above |
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(4) |
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4 (3) |
Flower yellowish to yellow; dorsal sepal and petals with maroon speckles 0.5-1 mm in diam. |
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7 P. concolor |
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Flower white or ivory, sometimes yellowish; dorsal sepal and petals with maroon spots 1.5-2 mm in diam. |
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8 P. bellatulum |
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5 (2) |
Leaves uniformly green, very rarely obscurely tessellated with dark and light green adaxially |
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(6) |
+ |
Leaves distinctly tessellated with dark and light green adaxially |
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(7) |
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6 (5) |
Flower white with a yellowish lip; staminode trullate, with a deep longitudinal groove centrally, 9-10 mm wide, yellow, strongly veined with red. |
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5 P. emersonii |
+ |
Flowers dull cream-colored, sometimes flushed at base with purple; staminode broadly obovate-triangular, nearly flat, 18-22 mm wide, cream-colored, heavily veined with red, and with a yellow tip. |
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6 P. hangianum |
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7 (5) |
Dorsal sepal apple-green or rarely yellowish green or greenish; scape usually 30-50(-65) cm. |
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1 P. malipoense |
+ |
Dorsal sepal not apple-green or yellowish green; scape usually 15-25(-30) cm |
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(8) |
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8 (7) |
Plants not stoloniferous; dorsal sepal and petals white, scarcely or obscurely spotted and veined with pale pink, particularly on dorsal surface. |
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4 P. delenatii |
+ |
Plants stoloniferous; dorsal sepal and petals yellow or whitish and conspicuously veined with red-purple |
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(9) |
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9 (8) |
Sepals, petals, and lip yellow, lip not much larger than synsepal. |
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2 P. armeniacum |
+ |
Sepals and petals white, strongly marked with purple on veins, lip much larger than synsepal, pink or rarely white. |
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3 P. micranthum |
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10 (1) |
Leaves tessellated with dark and light green adaxially; lip tuberculate on incurved lateral lobes |
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(11) |
+ |
Leaves uniformly green adaxially; lip not tuberculate on incurved lateral lobes |
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(14) |
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11 (10) |
Petals heavily spotted with blackish maroon over whole adaxial surface. |
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26 P. wardii |
+ |
Petals without or sometimes with blackish maroon speckles in basal half or a few blackish warts scattered |
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(12) |
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12 (11) |
Leaves densely spotted with purple abaxially; lip and staminode distinctly green veined. |
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27 P. venustum |
+ |
Leaves pale green abaxially or sometimes marked with purple at abaxial base; lip and staminode not green veined |
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(13) |
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13 (12) |
Leaves usually obscurely tessellated with dark and light green adaxially, and marked with purple at abaxial base; petals spatulate, with a few warts along upper margin of basal half. |
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24 P. appletonianum |
+ |
Leaves usually distinctly tessellated with green and whitish green adaxially, not marked with purple abaxially; petals suboblong or oblong-elliptic, usually with blackish maroon speckles in basal half. |
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25 P. purpuratum |
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14 (10) |
Inflorescence 2-6-flowered; petals more than 2 × as long as lip |
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(15) |
+ |
Inflorescence 1- or very rarely 2-flowered; petals less than 2 × as long as lip |
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(16) |
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15 (14) |
Ovary glabrous; perianth persistent until fruiting. |
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10 P. dianthum |
+ |
Ovary densely pubescent; perianth deciduous after pollination. |
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11 P. parishii |
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16 (14) |
Leaves rigid, leathery-succulent, usually 7-10(-12.5) cm; synsepal suborbicular; flowers yellow or ochre-yellow, dorsal sepal with a white margin. |
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18 P. helenae |
+ |
Leaves neither rigid nor leathery-succulent, usually (8-)10-40 cm; synsepal ovate to elliptic; flowers not as above |
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(17) |
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17 (16) |
Flower with 3 irregular longitudinal maroon bars on dorsal sepal and 2 similar bars on petals. |
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22 P. tigrinum |
+ |
Flower without maroon bars as above |
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(18) |
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18 (17) |
Dorsal sepal white with a maroon midvein; staminode convolute on basal margin and appearing like a pair of eyes. |
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23 P. spicerianum |
+ |
Dorsal sepal not colored as above; staminode without convolute basal margin as above |
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(19) |
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19 (18) |
Plants with a long and stout rhizome more than 8 × 1 cm. |
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16 P. areeanum |
+ |
Plants lacking a long rhizome as above |
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(20) |
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20 (19) |
Staminode subsquare, with a glossy convex center, lacking a distinct umbo; petals with dense blackish maroon speckles in basal half; lip ± puberulent on outer surface. |
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12 P. hirsutissimum |
+ |
Staminode obovate, with a distinct umbo centrally; petals without spots or with purple to dark maroon spots in basal half; lip glabrous on outer surface |
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(21) |
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21 (20) |
Dorsal sepal very broad, 4.6-6.7 cm wide, pinkish to white, usually with reddish veins; staminode white. |
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13 P. charlesworthii |
+ |
Dorsal sepal less than 4.5 cm wide, not colored as above; staminode not white |
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(22) |
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22 (21) |
Leaves 8-19 × 0.7-1.8 cm; petals 3-4 cm |
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(23) |
+ |
Leaves (15-)20-40 × 2-4 cm; petals 5-6 cm |
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(25) |
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23 (22) |
Dorsal sepal and petals with large maroon spots; petals 14-18 mm wide. |
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19 P. henryanum |
+ |
Dorsal sepal and petals without large maroon spots; petals 7-10 mm wide |
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(24) |
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24 (23) |
Petals undulate at margin; staminode with a yellow umbo in central or upper part. |
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15 P. barbigerum |
+ |
Petals strongly undulate at margin; staminode with a green umbo in lower part. |
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17 P. tranlienianum |
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25 (22) |
Petals 1.5-2 cm wide, with same color on both sides of midvein, apical half slightly broader than or nearly as broad as basal half; dorsal sepal finely spotted with black. |
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14 P. insigne |
+ |
Petals 2-4.5 cm wide, with different color on each side of midvein, apical half more than 2 × as broad as basal half; dorsal sepal unspotted or somewhat confluent-spotted with blackish maroon |
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(26) |
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26 (25) |
Peduncle shortly hairy; dorsal sepal white, often tinged with pale green or pale yellow toward its base; petals 2-2.5 cm wide. |
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20 P. gratrixianum |
+ |
Peduncle long hairy; dorsal sepal pale green to pale yellow, central area deep maroon and deeper striped; petals 2.2-4.5 cm wide. |
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21 P. villosum |