| References | this study | Tanaka (2004) | Ridley (1911) | Yamamoto (1943), Tanaka (2004) | Andrews (1810), Ker Gawler (1810), Redouté (1812 –1813), Ridley (1898, 1911, 1924: var. angustifolia), Tanaka (2004), Averyanov et al. (2021) | Wang & Tang (1936), Tanaka (2004) | Wan (1986), Tanaka (2004) |
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| Rhizome | stoloniform with long internodes (apical portion with short internodes) | – | – | creeping | short (only from Ridley 1898) | – | creeping |
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| Leaf blade: shape | linear to narrowly lanceolate | narrowly elliptic | narrowly lanceolate or linear | elongated-elliptic | lanceolate, elliptic or narrowly lanceolate | narrowly elliptic | lanceolate-elliptic |
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| Leaf blade: length (cm) | 13–22 | to 12.5 | 30–36 | 7–18 | 15–29 | 18–20 | 10–21 |
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| Leaf blade: width (cm) | 0.6–1.1 | to 3.1 | 0.6–1.3 | 2–4.5 | 2.5–6.6 | 3.5–4 | 3.5–7 |
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| Inflorescence: number of flowers per primary bract | 1 | 1–3 | 2 | – | 2–5 | 2–3 | 1–3 |
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| Flower color | violet | – | dull bluish green | – | blue or violet with green, green with violet and white, green with purple, or entirely violet | – | purple-caerulean |
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| Perianth: diameter (mm) | 7–8 | 3.5–4 | 6.4 | 5–6 | 5.5–9.5 | 6 | 9–11 |
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| Perianth: lobe length (mm) | 3 | 1.4–2 | – | 2 | – | 3 | 3.5–4 |
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| Perianth: shape | rotate (lobes sometimes slightly recurved) | more or less widely open (according to drawing) | – | – | subrotate or rotate | rotate | – |
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| Androecial corona: shape of apical margin | with 6 prominent broadly triangular lobes | circular, with erect margin (according to drawing) | – | – | circular or hexagonal | – | dentately 6-lobed |
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| Anther: shape | cylindrical to ovate | thecae horizontally divaricate | – | – | elliptic or oblong | – | – |
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| Ovary: position | inferior | semi-inferior | inferior | – | inferior | – | semi-inferior |
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