Amorphophallus infundibuliformis Hett., A. Dearden & A. Vogel

Protologue: Blumea 39 (1994): 259 

Synonym: – 


Tuber depressed-globose to subglobose, pinkish, no offset development. Leaf solitary. Petiole dirty whitish with numerous, confluent, irregular, green spots and scattered white dots, these more or less raised, top developing into an intercalary bulbil. Leaflets elongate-elliptic, long acuminate, margin with numerous small undulations, main veins impressed, upper surface green, moderately glossy. Inflorescence short peduncled. Peduncle hidden in cataphylls, 4 cm long, c. 0.8 cm in diam. (base), lengthening in fruit. Spathe for the lower half hidden in cataphylls, strongly convolute, funnel-shaped, obconic in side view, transversely orbicular-elliptic, 6 cm long, c. 8 cm in diam., very widely acute. Limb and base poorly differentiated, limb much shorter than base, both outside dirty whitish with pale brownish venation and scattered, small, angulate, blackish green spots, inside whitish, the lower half dark maroon, base within strongly, longitudinally ridged. Spadix sessile, obliquely inserted, slightly longer than spathe. Female zone oblique, very short cylindric, 0.5-1 cm long, c. 1 cm in diam.; flowers congested. Male zone cylindric, base oblique, 0.8-1.3 cm in length, c. 1 cm in diam.; flowers congested and partly ridge-like. Appendix cylindric, obtuse, whitish, to 6.5 cm long, c.1 cm in diam., entirely, densely covered with staminodes, these in the lower third shortly conical to aristate, sometimes uncinate and with long, narrowly decurrent, ridge-like bases, upwards shorter or reduced to only the base, to 2 mm long. Ovaries depressed, irregular or cubic, angulate in cross-section, 0.9-1.5 mm in diam., 1.2-1.5 mm high, reddish brown, near the style insertion maroonish, unilocular. Style absent or only basiscopically developed. Stigma sessile or partly sessile, acroscopically orientated, reniform, a shallow depression in the middle, one conic lobe on the outward facing margin, 0.8-1 mm in diam., 0.3-0.5 mm high, dark greyish brown, surface densely verruculate. Male flowers upwards fused into longitudinal chains, otherwise consisting of 3-5 stamens. Stamens 1-1.3 mm in diam., c. 0.7 mm long, rounded, oval or irregular in cross-section, white. Filaments absent or nearly so, entirely connate. Anthers truncate. Pores apical rounded or elongate (confluent). Infructescence short cylindric-fusiform, to 10 cm long and 7 cm in diam. Berries elongate, slightly conic, to 1.8 cm long, to 1 cm in diam. near the base, top truncate, orange-red, one seeded.

Amorphophallus infundibuliformis. (A) Inflorescence with peduncle hidden in cataphylls; (B) Part of spathe removed showing the arrangement of female and male flowers.


West Kalimantan (Indonesia) and East Malaysia (Sarawak). 


Amorphophallus infundibuliformis occurs exclusively on sandy peat podzols from 250-975 m altitute under moist or perhumid hill to upper hill mixed dipterocarp (lower altitudes) or oak/dipterocarp (higher altitudes) overlying sandstone (pers. comm. P. Boyce). 

Notes: Amorphophallus infundibuliformis is unique in the entire genus for the uncinate staminodes on the lower part of the appendix.

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