THAI FOREST BULLETIN (BOTANY) 36
Uses.— In China the rhizomes are used for the treatment of stomach ache and abdominal pain, cholera and hernia; externally to treat abscesses, snake or insect bites.
Notes.— Alocasia odora is a widespread and common species in the wild but, as with most of the macroherb Araceae is very poorly represented in herbaria due to the difficulty of collecting and preparing an adequate herbarium specimen.
Alocasia odora is often confused with A. macrorrhizos although as adult plants they are readily distinguished: A. odora has peltate leaves and proportionately much shorter spadix appendix. Further, Alocasia macrorrhizos never produces stolons from the base of the stems.
Alocasia perakensis Hemsl., J. Bot. 25: 205. 1887; Hay, Gard. Bull. Singapore 50: 316.
Semi-erect to decumbent, evergreen herb to ca 75 cm tall. Stem creeping to decumbent, somewhat elongate. Leaves several along the stem, irregularly interspersed with lanceolate cataphylls to 8 cm long drying red-brown. Petiole to ca 40 cm long, sheathing in the lower T, grey-green to purple-brown; lamina ovate to elliptic, peltate, coriaceous to thickly coriaceous and subsucculent, dark green to grey-green, apex broadly acute, acuminate for ca 1.5 cm, the margin mostly entire, occasionally somewhat sinuous in the lower part; primary lateral veins 2–3(–4) on each side of anterior costa. diverging at ca 45°–60°, running to a submarginal vein ca 1 mm from the margin; secondary venation not forming interprimary collective veins, mostly inconspicuous, but, like primary venation, adaxially impressed in dry state in thickly coriaceous leaves, posterior lobes completely united except for a shallow retuse notch, rarely with an acute notch to ca 1 cm deep. Inflorescence solitary to paired. Peduncle about half to subequalling the length of the petiole. Spathe ca 6 cm long; lower spathe ovoid, ca 3 cm long; limb narrowly ovate, ca 3 cm long, at first erect, then reflexed, greenish white. Spadix shorter than spathe, ca 5 cm long, stipitate for 4 mm. Female flower zone ca 7 mm long; ovaries globose, ca 2.5 mm diam. style 1.5 mm long; stigma prominently 2–3-lobed; sterile interstice ca 2.5 mm long, a single whorl of synandrodia; male flower zone 1.5 cm long, entirely within the lower spathe chamber, conic, ca 8 mm diam. at base narrowing to 5 mm at apex corresponding with spathe constriction; synandria 3–5-merous, ca 4 mm diam., more or less hexagonal; appendix narrowly cylindric, ca 2.5 cm long, 4 mm diam., deeply grooved, white to yellowish. Fruiting spathe ovoid, ca 4 cm long. Fruit an ellipsoid berry ca 1 by 0.4 cm, ripening bright red.
Thailand.— PENINSULAR: Yala. Distribution.— Peninsular Malaysia (Type). Ecology.— In montane forests, in leaf litter and on rocks; altitude: 1100–1525 m. Vernacular.— None recorded. Uses.— None recorded.
Notes. — Alocasia perakensis is a new record for Thailand and another example of a link between the aroid flora of the Central Range of Peninsular Malaysia with the mountainous area nearYala; other examples of of southern Thai/Central Range disjunction are Piptospatha perakensis (Engl.) Ridl., Pothos curtisii Hook.f., P. kingii Hook.f. P. macrocephalus Scort. ex Hook.f. & Scindapsus scortechinii Hook.f.