Alocasia ridleyi

Alocasia ridleyi is a houseplant species described by Alistair Hay. This species is part of the genus Alocasia and the family of Araceae. No subspecies are listed.

Species description

Small to robust herb ca. 45-ca. 1 m tall; rhizome 3-6 cm thick; leaves several together; petioles 35-50(-85) cm long, smooth or rarely scabrid, suberect to somewhat spreading, pale green and unmarked or with few to dense purple-brown dots and lines to flushed purple-brown throughout, sometimes with scattered small circular glands, sheathing in the lower ca. 1/5.

Blade narrowly ovato-sagittate to ovato-sagittate, ca. 15-30(-50) cm long; stiffly leathery, dark green adaxially and shining when young, becoming dull, paler abaxially; anterior lobe widest ca. 2-6 cm distal to petiole insertion; anterior costa with 3-4(-6) primary lateral veins, diverging at ca. 70° (proximal ones) to 50° (distal ones); axillary glands conspicuous (when petiole heavily pigmented) or not (when petiole not so).

Secondary venation flush on both surfaces, or very slightly prominent abaxially, not or hardly forming interprimary collective veins (these sometimes present in robust specimens); posterior lobes more than V2 to subequalling the length of the anterior, the inner sides narrowly to very narrowly (ob)lanceolate; posterior costae diverging at 60-90°

Inflorescence

Inflorescences several together; peduncle ca. 8-15 cm long, somewhat exserted from the cataphylls; spathe white to pink, sometimes with purple spots, 7-10(-13) cm long; lower spathe ovoid to pyriform, 2-4 cm long; limb oblong-lanceolate, erect then completely reflexed; spadix somewhat shorter than the spathe, very shortly stipitate for 1.5 mm, 6-9 cm long.

Female zone 1.5-2 cm; ovaries subglobose, close-packed, ca. 2 mm diam.; style very short, 0.25-0.5 mm long; stigma 2-3-lobed, turning yellowish in spirit; interstice 0.5-1 cm long, slightly attenuate, 4-5 mm diam., composed of 2-3 whorls of more or less close-packed rhombo-hexagonal synandrodia ca. 1.5-2 mm diam.; male zone 1.5-2 cm long, 1/4-V2 within the lower spathe chamber, usually slightly constricted level with the spathe constriction;.

Synandria ivory, rhombohexagonal, ca. 2 mm diam.; appendix tapering, 2-3 cm long, shghtly narrower than male zone, 5-6 mm diameter at base; fruiting peduncle elongating, to ca. 13 cm long; fruiting spathe broadly ovoid, white, sometimes with red spots; longitudinally dehiscent; fruits orange-red.

VARIEGATED FORMS:N/A

ETYMOLOGY: Alocasia ridleyiis named for H.N. Ridley, who took a special interest in Aroids of Borneo (Ridley, 1905), and who was the first to collect this species

CULTIVARS: N/A

HYBRIDS: N/A

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