THAI FOREST BULLETIN (BOTANY) 36
long after stems of similar length would be decumbent in A. macrorrhizos, the leaves conspicuously glaucous abaxially, the spathe limb internally and to an extent externally glaucous, the much more numerous and smaller synandria (ca 1 mm diam) with flat (not convex) synconnectives, the proportionately shorter (less than spadix length) appendix and the deeply cleft, erect stigma lobes. The spathe is marcescent into fruiting (vs. deliquescent).
Alocasia hypoleuca has potential as a landscaping ornamental, and would make an excellent candidate for ex situ conservation (in a broad sense) through the medium of ornamental horticulture sustained by tissue culture.
5. Alocasia longiloba Miq., Fl. Ned. Ind. 3: 207. 1856 Hook.f., Fl. Brit. India 6: 527. 1893; Ridley, Fl. Malay Penins. 5: 97 (sub. A. denudata). 1925; Gagnepain in H.Lecomte, Fl. Indo- Chine 6: 1147. 1942; Hay, Gard. Bull. Singapore 50: 299. 1998.— Alocasia cuspidata Engl., Bot. Jahrb. Syst. 25: 25. 1898.— Alocasia amabilis W.Bull, Cat. 143: 9. 1878.— Alocasia cochinchensis Pierre ex Engl. & K.Krause in H.G.A.Engler, Pflanzenr., 4. 23E: 103. 1920.— Caladium veitchii Lindl., Gard. Chron. 1859: 740. 1859.— Alocasia veitchii (Lindl.) Schott, Ann. Mus. Bot. Lugduno-Batavi 1: 125. 1863.— Alocasia lowii var. veitchii (Lindl.) Engl. in
L.P.de Candolle & A.C.P.de Candolle, Monogr. Phan. 2: 508. 1879.— Alocasia amabilis
Bull, Retail List 143: 9. 1878.
Small to usually robust, evergreen to sometimes seasonally dormant terrestrial (occasionally lithophytic) herbs to 150 cm tall. Stem rhizomatous, generally elongate, erect to decumbent, often completely exposed, sometimes swollen and sub-tuberous, ca 8–60 by 2–8cm diam., usually bearing remains of old leaf bases and cataphylls. Leaves often solitary, occasionally up to 3 together, subtended by conspicuous lanceolate papery- membranaceoous often purplish-tessellate cataphylls degrading to papery fibres. Petioles terete ca 30–120 cm long, sheathing in the lower ca T or less, glabrous, purple-brown to pink to green, often strikingly obliquely mottled chocolate brown. Lamina pendent, hastato- sagittate, rather narrowly triangular, 27–85 by 14–ca 40 cm, dark to very dark green, usually with the major venation grey-green adaxially, and abaxial surface either green or flushed purple, posterior lobes peltate for (5–)10–30% of their length, acute; anterior costa with 4– 8 primary lateral veins on each side, the proximal ones diverging at ca 60–100°; axillary glands conspicuous abaxially; secondary venation initially widely spreading, then deflected towards the margin; interprimary collective veins weakly formed and zig-zag at widely obtuse angles. Inflorescences solitary to paired, up to 4 pairs in succession without interspersed foliage leaves. Peduncle 8–18 cm long, resembling petioles, erect at first, then declinate, elongating and then erect in advanced fruit, subtended by a series of progressively larger cataphylls. Spathe 7–17 cm long, abruptly constricted ca 1.5–3.5 cm from the base; lower spathe ovoid to subcylindric, green; limb lanceolate, canoe-shaped and longitudinally incurved, 5.5–7.5 cm, eventually reflexing after male anthesis, membranous, pale green. Spadix somewhat shorter than to subequalling the spathe, ca 6–13 cm long, stipitate, stipe conic, to 5 mm long, whitish; female flower zone 1–1.5 cm; ovaries subglobose, ca 1.5–2 mm diam., green; stigma subsessile or on a slender style to ca 0.5 mm long, acutely and conspicuously 3–4-lobed, the lobes pointed, more or less spreading, white; sterile interstice 7–10 mm, narrower than the fertile zones, corresponding with the spathe constriction; lower synandrodia often with incompletely connate staminodes, the rest elongate rhombo-