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A REVIEW OF ALOCASIA (ARACEAE: COLOCASIEAE) FOR THAILAND

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Thailand.— NORTHERN: Chiang Mai, Chiang Rai, Nan, Lampang, Tak.

Distribution.— N.E. India (Assam), Nepal, N.Bangladesh, N. Burma, N. Lao PDR, N. Vietnam, S.W. China (not confirmed).

Ecology.— Moist evergreen lower montane forest, sometimes on limestone; altitude: 600–1650 m.

Vernacular.— None recorded. Uses.— None recorded.

Notes.— Alocasia navicularis is a common species in the wild but rather poorly represented in herbaria . It is most similar to A. odora but easily distinguished by the dark yellow spathe limb, and in lacking stolons at the base of the stems.

8.Alocasia odora (Lindl.) K.Koch, Index Seminum (B) 1854(App.): 2. 1854; Gagnepain in H. Lecomte, Fl. Indo-Chine 6: 1147. 1942.— Caladium odorum Lindl., Bot. Reg. 8: t. 641. 1822.— Arum odorum (Lindl.) Roxb., Fl. Ind. ed. 1832, 3: 499. 1832.— Colocasia odora (Lindl.) Brongn., Nouv. Ann. Mus. Hist. Nat. 3: 145. 1834.— Alocasia tonkinensis Engl., Pflanzenr., IV, 23E: 91. 1920.

Massive pachycaul evergreen herb to 2.5 m with slightly milky latex. Stem erect to

decumbent, with short stolons terminating in tubercles arising from the base. Leaves several to rather many together, clustered at the tips of stems of larger plants. Petiole to 1.5 m long; petiolar sheath membranous; lamina peltate, cordato-sagittate or cordato-ovate, to 130 by 100 cm, apex short acuminate, base margins undulate; primary lateral veins 9–12 on each side; interprimary veins forming well-defined interprimary collecting veins. Inflorescences 2–3 together among the leaf bases, subtended by membranous cataphylls. Peduncle stout, ca 35 cm long, exceeding the cataphylls at anthesis. Spathe ca 13–25 cm long, constricted about of the way from the base; lower part ovoid, green; limb broadly oblong- lanceolate, 10–30 by 4–8 cm, cowl-like at anthesis, later reflexed, then deliquescent, membranous, greenish white. Spadix shorter than the spathe, shortly stipitate; female flower zone 1–2 by ca 1.5 cm diam.; ovaries pale green, ca 3 mm diam.; stigma sessile, weakly 3-lobed, the lobes blunt, pale green; sterile interstice equalling the male zone, ivory, very slightly narrowed corresponding to the spathe constriction; synandrodia , composed of rhombo-hexagonal, ca 2.5 mm diam.; male flower zone cylindric, ca 3–5 cm long, ca 2 cm diam., whitish; synandria rhombo-hexagonal, convex-topped due to cap-forming synconnective, ca 1.5 mm diam.; appendix elongate-conic, 3–5.5 by 1–2 cm, equalling length of the spadix, markedly thicker than the male zone at the base, thence slowly tapering,

white. Fruiting spathe ca 6 cm long. Fruits globose, ca 1 cm diam., ripening scarlet.

Thailand.— SOUTHWESTERN: Kanchanaburi; PENINSULAR: Phuket.

Distribution.— India (Assam) through to SW China, SW Cambodia and east to Japan (Ruykyu Is.).

Ecology.— Primary and secondary tropical rain forests, bamboo-thickets, riverbanks, swamps, sometimes on limestone; altitude: below 1700 m.

Vernacular.— None recorded.

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