Table 1.

Morphological differences amongst Amorphophallussakonnakhonensis, A.harmandii Engl. & Gehrm. and A.linearis Gagnep.

Characters	Amorphophallussakonnakhonensis Chatan & Promprom	A.harmandii Engl. & Gehrm.	A.linearis Gagnep.
Tuber	5–10 cm long and 0.4–1.0 cm diam., not branching	ca 40 cm long and 2 cm diam., not or occasionally branching	10–45 cm long and 1–2 cm diam., not or occasionally branching
Petiole	2.5–2.8 × 0.2–0.3 cm	20–80 cm by 4–10 mm	25–85 by 0.5–1.5 cm
Leaf blade	up to 10 cm diam.	36–74 cm diam.	30–80 cm diam.
Leaflet	elliptic or obovate, ca 0.5–3.0 × 0.3–0.5 cm	elliptic, elliptic-lanceolate or lanceolate, 2–20 × 1–7 cm	linear, less often lanceolate, 3–17 × 0.2–1.0 cm
Peduncle	3.0–5.5 cm long, 2.0–2.5 mm diam.	peduncle 6–18 cm long, 3–4 mm diam.	19–55 cm long, 0.3–1 cm diam.
Spathe	broadly ovate, 2.0–2.2 × 1.5–1.8 cm, smooth on both surfaces, except for the base verrucate adaxially	ovate to orbicular, 5–13 × 5–10.5 cm, base densely verrucate, verrucae small adaxially	elongate-triangular or lanceolate, 7–16 × 3.5–6 cm, base within densely clothed with irregular, laterally compressed, ridge-like, sometimes flaky, often confluent, warts, often with short or long hair-like branches
Spadix	2–3 cm long	8–15 cm long	12–57 cm long
Female flowers	slightly distant from each other; style ca. 1 mm long; disc-like, slightly smooth surface, concave centre, ca. 0.2 × 0.1 mm stigma	closed to each other; style 2–3 mm long; depressed, shallowly bilobed, ca 0.6 × 1.5 mm stigma	closed to each other; style 1–2 mm long; capitate globose, 1.0–1.3 × 0.9–1.5 mm stigma
Staminate flower zone size	1.5–2.0 × 0.6–0.8 cm; slightly cylindrical, narrower upper part	3–6 × 1–1.7 cm; fusiform-conical or lageniform with distinctly dilated basal haft	2.5–8 × 0.4–2 cm; conical or slightly lageniform
Appendix	slightly cylindrical to elongate-fusiform; 1–3 × 0.8–1.0 cm, erect or slightly erect; creamy white, never green	very narrowly conical, near myosuroid or fusiform conical or slightly sigmoidally curved forward in the lower half; 5–18 cm × 5–16 mm; creamy white or greenish yellow	myosuroid, base slightly narrowed, 18–50 × 0.5–1.6 cm, at first erect, nodding after anthesis; creamy white or green;