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Table 2 Key to the identification of Tripidium species

From: Whole chloroplast genome and gene locus phylogenies reveal the taxonomic placement and relationship of Tripidium (Panicoideae: Andropogoneae) to sugarcane

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
  1. Presented here is a key to the identification of Tripidium species. This key covers all currently accepted Tripidium species as well as those species moved into genus Tripidium as a consequence of the present study. The characters chosen in this key allow for simple disambiguation amongst the species. The three species marked with a double dagger (‡) superscript are the currently accepted members of Tripidium. The four remaining species were added to Tripidium as a result of this study