Capillipedium, Stapf, 1917

Tiwari, Arjun Prasad & Landge, Shahid Nawaz, 2021, Capillipedium mistryi (Andropogoneae, Poaceae): a new remarkable species from central India, Phytotaxa 498 (1), pp. 51-57 : 55

Key to the species of Capillipedium

1. Pedicels and rhachis internode solid (if grooved then quite inconsistently, and then not translucent); racemes bearing 11–25 sessile spikelets on each................................................................................................................................................................... C. mistryi

1. Pedicels and rhachis internode always with a distinct translucent groove; racemes bearing 1–5 (–8) sessile spikelets on each .....2.

2. Pedicels flat; sessile spikelet awnless ................................................................................................................. C. planipedicellatum

2. Pedicels terete or compressed; sessile spikelet awned ......................................................................................................................3.

3. Awns more than 4.0 cm long .............................................................................................................................................................4.

3. Awns less than 4.0 cm long ...............................................................................................................................................................5.

4. Leaf-blade up to 4.0 cm long; panicle 1.0–2.0 cm long; sessile spikelet ca. 3 mm long ............................................... C. magdaleni

4. Leaf-blade up to 10 cm long; panicle ca. 8.0 cm long; sessile spikelet 3.5 mm long ................................................ C. longisetosum

5. Panicle branches and axis more or less densely hairy or at least the upper part of the racemes peduncle villous ...........................6.

5. Panicle branches and axis glabrous ...................................................................................................................................................9.

6. Panicle branches and axis pubescent to puberulous..........................................................................................................................7.

6. Panicle branches and axis long hairy or at least the upper part of the racemes peduncle villous hairy ............................................8.

7. Panicle open, lanceolate, ca. 12 cm long; sessile spikelet 2.2–2.5 mm long; pedicelled spikelet as long as sessile ........................... .............................................................................................................................................................................................C. duongii

7. Panicle contracted, oblong; 5.0–7.0 cm long; sessile spikelet 5.5 mm long; pedicelled spikelet shorter than sessile ........................ ................................................................................................................................................................................... C. leucotrichum

8. Peduncles of raceme pilose; racemes bearing 3–5 sessile spikelets............................................................................. C. pteropechys

8. Peduncles of raceme tubercle-based hairy (hirsute); racemes bearing 2–3 sessile spikelets ............................................ C. laoticum

9. Pedicelled spikelet longer than sessile spikelet...............................................................................................................................10.

9. Pedicelled spikelet shorter than or as long as the sessile spikelet ...................................................................................................12.

10. Culms woody, 1.5–3.5 m tall; sessile spikelet 1.8–2.5 mm long ....................................................................................... C. assimile

10. Culms not as above; up to 1.2 m tall; sessile spikelet 3.0–4.0 mm long.........................................................................................11.

11. Panicle ovate, 10–18 cm long; racemes bearing 2–4 sessile spikelets on each; sessile spikelet 3.0 mm long ........................ C. kuoi

11. Panicle oblong, ca. 8.0 cm long; racemes bearing 4–6 sessile spikelets on each; sessile spikelet 4 mm long .................. C. nagense

12. Racemes bearing 3–8 (–8) sessile spikelets.....................................................................................................................................13.

12. Racemes bearing 1–3 sessile spikelets ............................................................................................................................................14.

13. Culms up to 30 cm long; leaf blades 6.0– 10 cm long; panicle 4.0–8.0 cm long; racemes bearing 3–5 sessile spikelets.................... ..................................................................................................................................................................................... C. kwashotense

13. Culms 100–150 cm long; leaf blades 20–40 cm long; panicle 10–25 cm long; racemes bearing 3–8 sessile spikelets ...................... ....................................................................................................................................................................................... C. spicigerum

14. Sessile spikelet 6.0–7.0 mm long; lower glumes of sessile spikelet dorsally with a deep groove.................................... C. sulcatum

14. Sessile spikelet 2.5–5.0 mm long; lower glumes of sessile spikelet flat to shallowly concave ......................................................15.

15. Sessile spikelet 4.5– 5.0 mm long ................................................................................................................................. C. annamense

15. Sessile spikelet 2.5–4.0 mm long ....................................................................................................................................................16.

16. Culm up to 25 cm tall, unbranched; panicle up to 5.0 cm long .......................................................................................... C. alpinum

16. Culm up to 180 cm tall, branched or much branched; panicle up to 25 cm long ...........................................................................17.

17. Leaves slightly narrowed or rounded at the base; panicle large, effuse; lower glume of sessile spikelet channelled. C. parviflorum

17. Leaves conspicuously narrow at the base, sometimes with petiole (especially in C. huegelii ); lower glume of sessile spikelet not channelled........................................................................................................................................................................................18.

18. Culm weak, decumbent and trailing; sessile spikelet 2.0–3.0 mm long; lower glume of sessile spikelet ovate, chartaceous; 2- keeled................................................................................................................................................................................. C. filiculme

18. Culm robust, erect; sessile spikelet 3.0–4.0 mm long; lower glume of sessile spikelet oblong, membranous, without keels ............ ............................................................................................................................................................................................ C. huegelii