Accepted Name : This is currently accepted.

Description : Moderate to large, robust, strongly aromatic (mango resin), stemless to erect to decumbent-stemmed herb to 1 m. Stem erect, later decumbent, 1–3 cm diam., usually covered with leaf bases for the terminal half, older portions naked or with semifibrous petiole and cataphyll remains. Leaves several together; petioles up to 45 cm long, pale to mid-green to deep red, with darker longitudinal streaks to ca 1.5 cm long; petiolar sheath 7–11cm, margins membranous, persistent, often darker coloured or red when petiole green; leaf blade ovate-sagittate, 15–45 by 10–22 cm, base sagittate, the sinus very wide (up to ca 7 cm) but shallow, apex acute, with a ca 2 mm tubular mucro, coriaceous, mid-green above, paler green to deep red below, drying distinctively dark brown; venation of posterior costae with ca 4 primary lateral veins arising more or less together, anterior costa with 5–9 primary lateral veins and a similar number of finer, interprimary veins diverging from the midrib at 30°–45°; secondary venation striate. Inflorescences 1–7 together; peduncle 10–18 cm, erect (developing and floral) to declinate (after anthesis and fruiting), coloured as for petioles; spathe oblong, 8–14 cm long; spathe limb gaping at anthesis, then closing again and persistent into fruit, greenish white internally, yellowish to medium red-white externally, usually with darker spotting on the base and dorsal surfaces associated with extrafloral nectaries; spadix tapering-cylindrical, 8–13 cm, barely exceeding spathe, short stipitate; stipe ca 2–4 mm, pale green; pistillate flower zone ca 3 by 1 cm, weakly fusiform; ovary depressed ovoid-globose, ca 1 mm diam., with an associated, very slender-stalked, globose-clavate topped staminode equalling the height of the ovary; ovary very pale green; stigma capitate, sessile, equalling the ovary diam., pale yellow-white, staminode ivory; staminate flower zone 5.5–6 cm by 1 mm, tapering fusiform; staminate flowers 4–5-androus, rhombohexagonal in plan view, ca 3 by 2 mm, overtopped by a large connective, ivory white, lowermost flowers sterile. Fruits ovoid, pale green, ca 3 mm diam.

Thailand : PENINSULAR: Nakhon Si Thammarat, Trang, Satun, Songkhla, Yala.

Distribution : Peninsular Malaysia (type).

Ecology : Primary perhumid to moist evergreen lowland forests.

Notes: Homalomena pontederiifolia is a distinctive element in the evergreen forests of Peninsular Thailand. There is a long history of confused naming of the plant, with numerous attempts to place it in synonymy with Javanese and Sumatran endemic taxa (H. pendula and H. sagittifolia) while overlooking the perfectly satisfactory name exists which is adopted here. A similar situation existed with H. truncata q.v.

Homalomena pontederiifolia is part of a complex of species, with related several taxa in Vietnam, including H. cochinchinensis Engl. and H. tonkinensis Engl. In addition, several names in this complex have been misapplied in Indochina, notably H. gigantea Engl., a Bornean species.