Aglaonema commutatum var. warburgii (Engl.) Nicolson

Aglaonema commutatum var. warburgii (Engler) Nicolson

Aglaonema warburgii Engler, 1915, p. 20.

Petioles green, 13–24 (27) cm long, 1.0–1.4 times as long as the leaf-blade. Petiolar sheaths 7–14 cm long. Leaf-blades 10.5–24 cm long, 4–8.5 cm wide, length/width ratio 1:2.2–2.8(3.1); variegation barred, along primary lateral veins; venation differentiated into 4–7 primary lateral veins diverging from the midrib at (45°) 50°–70°. Spathe 3–4.5 cm long. Spadix 1.6–2.5 cm long, shorter than spathe by 0.8 cm (in the type) to equaling it; staminate portion 1.1 cm long, 0.4 cm thick.

TYPE COLLECTION.—North Celebes, Menado [August-September 1888] Warburg s.n. (holotype: B).

The type material shows the usual barred variegation pattern of Aglaonema commutatum. It is distinct by its long petioles, which equal or exceed the length of the leaf-blade. A long petiole is also usual in A. marantifolium and a relationship to that species is also indicated by the fact that the stipe often equals the spathe decurrency. The material seems to be morphologically distinct enough to warrant maintenance at the varietal level for the time being.