Table 1.

Morphological comparison of Bulbophyllum reflexipetalum and its closely related species.

Characters	Bulbophyllum reflexipetalum	B. salweenensis	B. umbellatum	B. guttulatum
Pseudobulbs	flattened ovoid or ovoid-conic, without sheaths	ovoid-conic, with sheaths	ovoid-conic or narrowly ovoid, without sheaths	ovoid or ovoid-conic, without sheaths
	10–16 × 8–15 mm	10–40 × 4–6 mm	20–25 × 7–10 mm	13–35 × 10–20 mm
Leaf blade	oblong, apex emarginate, 5–6.5 × 1.5–2 cm	narrowly oblong, apex emarginate, 4–16 × 0.5–2.5 cm	oblong, apex emarginate, 8–19× 1.3–2.8 cm	elliptic-oblong, apex rounded, 7–14 × ca. 3 cm.
Scape	13–20 cm, longer than leaf	4–9 cm, shorter than leaf	10–15 cm	8–12 cm
Pedicel and ovary	10–15 mm	ca. 10 mm	ca. 20 mm	ca. 25 mm
Flowers	greenish yellow with dark brown spots	greenish yellow with purplish red spots	dark greenish yellow or brown with purplish apex	yellow with red spots
Dorsal sepal	Ovate, apex obtuse, base with 1 dentate	ovate, acuminate, entire.	ovate, concave, apex acute	broadly ovate, apex mucronulate
Petals	Reflexed, broadly ovate-triangular, ca.3.23 × 2.52 mm, apex mucronate	lanceolate, denticulate, ca. 5 × 2 mm, apex caudate	ovate, ca. 7 × 5 mm, obtuse-rounded	broadly ovate-triangular, ca. 4.5 × 4 mm, apex mucronate
Lip	greenish yellow, adaxially with dark brown spots or patches	whitish purple at base, pink at apex, keel pink.	white	white with purple spots
	triangular-lingulate, apex obtuse, ca. 4.02×2.94 mm	lingulate, apex obtuse,	lingulate, apex obtuse,	subovate, apex emarginated, 5 × 3.4 mm
		ca. 8×3 mm;	ca. 8×3 mm;
	adaxially papillae with a longitudinal ridge, margin revolute, abaxial with a longitudinal groove;	adaxially papillae with a longitudinal ridge	adaxially papillae with a longitudinal ridge	adaxially with 3 longitudinal ridges