w. L. A. HETIERSCHEID, 2003 113 Notes on the Genus Amorphophallus 12: Three New Species from Tropical Asia W. L. A. Hetterscheid Chrysantenstraat 28 1214 BM Hilversum Netherlands ABSTRACT Three new species of Amorphophallus from Asia are described. Their morpholog- ical similarities to other species are dis- cussed. KEYWORDS Araceae, Amorphophallus operculatus, Amorphophallus sinuatus, Amorphophal- Ius vogelianus, Thailand, Vietnam. INTRODUCTION Ongoing fieldwork by Nguyen V.D. (Hanoi, Vietnam) and discoveries made in existing collections still result in the rec- ognition of undescribed species of Amor- phophallus. It is expected that with this rate of new discoveries the total number of species of Amorphophallus (presently at ca. 190) will definitely exceed 200. SPEcms DESCRIPTIONS 1. AmorphophaUus operculatus Hett. & Sizemore sp. nov.-Type: Hetter- scheid HAM.994- T (L, spiritcol!., ho- lotype), THAILAND, Chumphon prov., Chumphon, col!. from a living plant in the Leiden Botanical Garden, 31 July 2003 (orig. col!. M. Sizemore s.n.). Figures 1-4. Diagnosis-Ab Amorphophallo sauru- rus tubero multo tenuiore longioreque, spadice spatha aequilonga, antheris infer- ioribus operculatis differt. Tuber elongate, thin, vertically rhizo- matous, branching, to 40 cm long, 1-4 cm in diam. at the top; petiole 10-65 cm long, 0.4-1.5 cm in diam., smooth, uniformlyol- ive green to dark rich reddish green, sometimes with a few small, dark spots near the base; lamina moderately or highly dissected, 20-70 cm in diam., rachises winged throughout; leaflets elongate ovate to ovate-Ianceolate, top acute-acuminate, 2-14 cm long, 1-5 cm in diam., fleshy, up- per surface a rich dark emerald green, margin reddish, lower surface dark greyish green, often flushed dark purple-violet, ra- chises on the lower side rich dark reddish purple. Peduncle 33-50 cm long, 6-8 mm in diam., smooth, dull reddish mauve with or without a few darker, irregular indistinct spots at the base. Spathe broadly triangu- lar-elliptic, 8-12 cm in long., 6-11 cm in diam., margins concave, base and limb hardly separated, base convolute, ca. half the length of the spathe, not opening to the base during male anthesis, top acute, outside whitish changing to pale dirty greyish-white near the base, veins pale pinkish, upper half suffused with a pale pinkish-purplish hue, inside dirty whitish, top with a pinkish-purplish hue, base within densely clothed with mostly more or less globose verrucae, those on the dor- sal side and close to the spadix base elon- gate and/or slightly rugate, the entire inner surface of the base covered with a wet film. Spadix sessile, longer than spathe, 10-14.5 cm long; female zone cylindric, 0.8-1 cm long, 0.8-1.1 cm in diam., flow- ers congested; male zone elongate, slightly conical, base constricted, top slightly or more distinctly laterally compressed, 3.5- 4.8 cm long, 0.8-1.4 cm in diam. at the base, 0.5-1.2 cm in diam. at the top, flow- ers congested; appendix elongate conical, thin-walled, 5-8.2 cm long, 0.9-1.5 cm in diam. at the base, terete or slightly laterally compressed, more distinctly near the base,