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. 2016 Mar 23;11(3):e0150631. doi: 10.1371/journal.pone.0150631
Identification key to Vietnamese species of sect. Subulatum.
1a. Leaves 4-5 mm wide, succulent, thick and rigid; flowers not widely opening, 2.5–3.0 mm wide C. subulifolium Aver. & Averyanova
1b. Leaves wider than 9 mm, thinner; flowers widely opening, 3–9 mm wide 2
2a. Mid-lobe of the lip clearly upward-pointing, with a tip usually bent inwards C. recurvum (Hook.) ined.
2b. Mid-lobe of the lip straight (flat) or with only slightly upward-bent margins 3
3a. Leaves narrow (ca. 1.4 cm wide), up to 30 cm long C. subulatum Blume
3b. Leaves wider (ca. 2.2 cm wide) and shorter (ca. 10-12 cm long) C. scortechinii (Hook.f.) Garay

Note: C. rostratum (Lindl.) Garay reported from Vietnam by [51] and [24] is considered to be a synonym of C. recurvum (Hook.) ined. [4]. The latter species was not reported from Vietnam previously.