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. 2016 Mar 23;11(3):e0150631. doi: 10.1371/journal.pone.0150631
Identification key to Vietnamese species of sect. Mitriformes.
1a. Stem short, erect; leaves thick and short, densely arranged, often recurved C. arietinum (Rchb.f.) Garay
1b. Stem long and pendant; leaves thin and long, loosely arranged, usually falcate C. williamsonii (Rchb.f.) Garay