1a. Habitat: Perennial, caespitose | |
2a. Glumes similar | |
3a. Leaf blade surface smooth on both sides | |
4a. Spikelet callus hairs white, 1.5× length of spikelets | |
5a. Rhachis internode 3.5–4 mm long | |
Tripidium arundinaceum | |
5b. Rhachis internodes 6–7 mm long | |
Tripidium procerum | |
4b. Spikelet callus hairs yellow or red, 2–3× length of spikelet | |
Tripidium rufipilum | |
3b. Leaf blade surface scabrous — rough on both sides | |
Tripidium strictum‡ | |
2b. Glumes dissimilar | |
6a. Glumes exceeding apex of florets, lower glumes elliptic, upper glumes lanceolate | |
Tripidium ravennae‡ | |
6b. Glumes 1× length of spikelet, lower glume 2 keeled, lower glume hairs 4–9 mm long, upper glume without keels | |
Tripidium bengalense‡ | |
1b. Habitat: Perennial, culms solitary | |
Key characters: Culms erect, 70–100 cm long, 5–15 mm diameter, rhizomes short, leaf blade hairy at base. Spikelet callus hairs 3–6 mm long. | |
Tripidium kanashiroi |