Poa

Key to the species of Poa View in CoL found in the Indian Eastern Himalaya

1. Keels of palea with slender hooks ............... 2

1. Keels of palea without slender hooks.......... 5

2. Callus woolly…...............................................3

2. Callus glabrous…............................................4

3. Aerial shoot always solitary; panicle branches usually smooth… ............................ P. alpigena View in CoL

3. Aerial shoots several; panicle branches usually spinulose…......................... P. pratensis View in CoL

4. Ligule mostly 3–8 mm high….... P. asperifolia View in CoL

4. Ligule up to 1.5 (–2) mm high…. P. polyneura View in CoL

5. Rhizomatous perennial; lemmas 1.5–1.6 mm broad, long ciliate on basal half of keel (midvein) and lateral veins, surface between veins smooth, flushed gold with sub-apical purple band and apical hyaline part; palea keels 2–3 dentate on upper part of keels ............................................................ P. calliopsis View in CoL

5. Plants never with above character combinations ............................................ 6

6. Palea keels smooth ........................................ 7

6. Palea keels scabrid or ciliate to pillulose..... 10

7. Panicle oblong in outline ................ P. albertii

7. Panicle pyramidal to ovoid in outline......... 8

8. Spikelets wedge-shaped............. P. lachenensis View in CoL

8. Spikelets ovate to oblong ............................. 9

9. Plants annual; anthers 0.2–1.1 mm long ............................................................ P. annua View in CoL

9. Plants perennial; anthers 1.2-3.5 mm long ............................................................ P. supina View in CoL

10.Lemma keel never ciliate .......... P. dzongicola View in CoL

10.Lemma keel ciliate, at least at lower half (sometimes scabrid in P. szechuensis View in CoL ) ......... 11

11.Plant glaucous throughout.. P. nitidespiculata View in CoL

11.Plants never glaucous throughout (sometimes only spikelets glaucous in P. gammieana View in CoL )......12

12.Ligule whitish ............................................. 13

12.Ligule otherwise, never whitish ............... 14

13.Spikelets obovate ..................... P. hirtiglumis View in CoL

13.Spikelets elliptic-oblong .............. P. falconeri View in CoL

14.Anthers> 1 mm long ................................ 15

14.Anthers up to 1 mm long .......................... 23

15.Number of culm nodes> 5 .... P. gammieana View in CoL

15. Number of culm nodes <5 .......................... 16

16.Ligule usually 0.2–1 mm high .................. 17

16.Ligule usually 1.5–10 mm high................. 18

17.Leaf sheaths as long as leaf blades; panicle open, broadly triangular; spikelets elliptic to oblong ............................................... P. mairei View in CoL

17.Leaf sheaths shorter than leaf blades; panicle slender; spikelets lanceolate ....... P. nemoralis View in CoL

18.Culm nodes distinctly constricted and translucent ................................... P. pagophila View in CoL

18.Culm nodes otherwise, not as above ........ 19

19.Leaf blades folded or inrolled to needleshape, firm ................................... P. attenuata View in CoL

19.Leaf blades flat or if folded never needleshaped, not firm ......................................... 20

20.Ligules smooth abaxially.................. P. alpina View in CoL

20.Ligules scabrous or scaberulous abaxially... 21

21.Annual; upper glumes> 4 mm long; florets 3–7................................................. P. hylobates View in CoL

21.Perennial; upper glumes < 3.5 mm long; florets 2–3 ....................................................22

22.Ligule 2.3–3 mm high ............ P. mustangensis View in CoL 22.Ligule 3.5–10 mm high ................... P. trivialis View in CoL

23.Palea keels eciliate, rather scabrid ............. 24

23. Palea keels ciliate at least below to medially.... 29

24. Lowest lemma 4.2–6.5 mm long.... P. eleanorae View in CoL

24.Lowest lemma 1.5–3.8 mm long............... 25

25.Spikelets narrowly wedge-shaped............. 26

25.Spikelets oblong, lanceolate, ovate to narrowly elliptic ............................................................. 27

26.Leaves arranged throughout culm length ........................................................... P. cooperi View in CoL

26.Leaves arranged 2 / 3 length of culm.... P. longii View in CoL

27.Collar ciliate ............................ P. rajbhandarii View in CoL

27.Collar glabrous............................................ 28

28.Spikelets ovate, < 4 mm long; lemmas elliptic, 1.5–2.6 mm long ...................... P. szechuensis View in CoL

28.Spikelets oblong to lanceolate,> 4.5 mm long; lemmas oblong, 2.7–3.3 mm long ...................................................... P. wardiana View in CoL

29.Keels of palea a few-hooked distally... P. nepalensis View in CoL

29.Keels of palea never hooked ...................... 30

30.Callus glabrous.......................... P. sikkimensis View in CoL

30.Callus woolly............................................... 31

31.Panicle branches 2–4 per node.... P. khasiana View in CoL

31. Panicle branches always 2 per node............. 32

32. Collar glabrous; ligule 2.5–5 mm long... P. stapfiana View in CoL

32. Collar strigulose or ciliate; ligule 0.8–2.5 mm long ................................................................ 33

33. Lemma glabrous between veins ..... P.himalayana View in CoL

33. Lemma hairy between veins.......... P. burmanica View in CoL