| 1 |
Cells on nutlet surface transversely oblong with an elevated margin resulting in nutlet surface transversely undulately striate or scabrously rugose
|
(2)
|
| 1 + |
Cells on nutlet surface hexagonally reticulately striate or puncticulate
|
(4)
|
| 2 (1) |
Culms 10-35 cm tall; spikelets narrowly oblong-ovoid to narrowly linear-ovoid, 0.8-2 cm × 3-3.5 mm, 16-30-flowered; glumes brown to dark brown.
(9)
|
P. diaphanus
|
| 2 (1) + |
Culms 3-15 cm tall; spikelets ovoid, oblong-ovoid, or narrowly ovoid, 5-15 cm × 2.5-4 mm, 8-16-flowered; glumes straw-colored, yellowish brown, or purplish red
|
(3)
|
| 3 (2) |
Culms slender; leaves 0.3-1.5 mm wide; anthela rays very short; spikelets 1 to several per ray, nearly fascicled; glumes purplish red to reddish brown on both surfaces.
(10)
|
P. setiformis
|
| 3 (2) + |
Culms slightly thick; leaves 1-3 mm wide; anthela rays mostly to 2.5 cm; spikelets 3-8 per ray, congested; glumes straw-colored to yellowish brown.
(11)
|
P. pseudolatespicatus
|
| 4 (1) |
Glumes broadly sulcate on both surfaces.
(8)
|
P. sanguinolentus
|
| 4 (1) + |
Glumes not broadly sulcate on both surfaces
|
(5)
|
| 5 (4) |
Glume apices truncate to emarginate and excurved mucronate to awned.
(7)
|
P. pumilus
|
| 5 (4) + |
Glume apices obtuse or acute and not excurved mucronate
|
(6)
|
| 6 (5) |
Spikelets narrowly linear-ovate, narrowly ovoid, narrowly oblong-ovoid, or oblong-ovoid; glumes densely imbricate, ca. 3 mm or more; stamens 3
|
(7)
|
| 6 (5) + |
Spikelets linear, linear-oblong, narrowly linear-ovoid, or narrowly ovoid; glumes slightly laxly imbricate or rarely densely imbricate, 1.5-2 mm; stamens 1 or 2
|
(8)
|
| 7 (6) |
Spikelets ca. 2.5(-3) mm wide; glumes blackish brown.
(1)
|
P. delavayi
|
| 7 (6) + |
Spikelets 3-5 mm wide; glumes straw-colored or yellowish brown.
(2)
|
P. unioloides
|
| 8 (6) |
Nutlet oblong, both surfaces concave sulcate; stamen 1.
(6)
|
P. sulcinux
|
| 8 (6) + |
Nutlet obovoid-oblong or obovoid, both surfaces not concave sulcate; stamens (1 or)2
|
(9)
|
| 9 (8) |
Anthelae with very short rays; spikelets narrowly ovoid to narrowly linear-ovoid; glumes subelliptic, abaxially not conspicuously keeled.
(5)
|
P. lijiangensis
|
| 9 (8) + |
Anthelae simple, lax, usually with slightly long or rarely very short rays; spikelets linear-oblong or linear; glumes oblong-ovate or subovate, abaxially keeled
|
(10)
|
| 10 (9) |
Spikelets radiately arranged; rachilla 4-angled, with trabeculae in both lateral sulculi; glumes brown to dark brown, laxly imbricate, apex obtuse; anthers oblong.
(3)
|
P. flavidus
|
| 10 (9) + |
Spikelets suberect; rachilla flexuose, narrowly winged; glumes straw-colored to rarely pale brown, densely imbricate, apex sometimes mucronate; anthers linear.
(4)
|
P. polystachyos
|
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