Javaniska Elflora

Alocasia robusta

Alocasia robusta

Alocasia robusta is a gigantic species of the Arum family Araceae. This species is endemic to the island of Borneo. The inflorescence is the spathe and spadix typical of the Arum family, with the spathe being a very dark blackish-purple color. This species was unknown to science prior to 1967. The plant is usually trunkless.

SYNONYMS: N/A

DISTRIBUTION: Widespread in Borneo, though mainly in the northwest, and with one record from the Natuna Islands.

We have seeds, offset tubers, and plants from Alocasia Genus, click here to see our Alocasia collection.

Species description

Gigantic arborescent herb to palmiform tree to 6 m tall with clear sap that almost instantly turns orange on contact with air; stem erect to decumbent, 15-30 cm diam. (the base swelhng to ca. 40 cm ), smooth;

Leaves several together: petiole smooth, somewhat glaucous, pale green to pinkish brown, ca. 1.5-3.5 m long, sheathing in the lower V3, with scattered flat + circular glands: blade ovato-sagittate, ca. 1.5-4 m long, ca. 80 cm to 2.5 m wide, slightly glossy mid-green adaxially, abaxially waxy glaucous, the margin entire to slightly sinuate; anterior lobe up to ca. 3.2 m long, widest at the base; anterior costa with 10-18 primary lateral veins diverging at ca. 70-80°;

Secondary venation not prominent, not forming interprimary collective veins; posterior lobes to ca. 90 cm long, rounded; posterior costae diverging at ca. right angles, bearing lamina right into the sinus (in juveniles peltate until leaf blades are ca. 30 cm long).

Inflorescence

Inflorescences ca. (10-)30-40 crowded together in the centre of the leafy crown, subtended by robust broadly lanceolate deliquescent to marcescent cataphylls; peduncles stout, hardly exserted from the cataphylls, ca. 15-20 cm long; spathe to ca. 20 cm long, constricted at ca. 4-5 cm from the base;

Lower spathe pale greenish ivory with few to numerous shiny colourless to dark red horizontal glandular markings, ovoid, ca. 2.5 cm diam.; hmb cowl-like, by male anthesis the base sharply reflexed then the rest erect, forming a pollen-filled trough at the bottom, deep purplish pink to greyish ivory faintly suffused pink, ca. 15 cm long x 6 cm wide; 

Spadix somewhat shorter than the spathe, ca. 15-19 cm long, sessile to very shortly stipitate; female zone subpyramidal, trigonous, 2-3 cm long, ca. 2 cm diam at base, tapering to ca. 1.5 cm diam. distally; pistils ivory; ovary subglobose, faintly longitudinally ridged, ca. 1.5 mm diam.; style slender, ca. 0.5 mm long or absent; stigma button-like to faintly 3-4-lobed; sterile interstice slightly wider than female zone, reduced to 1-2 whorls of small yellow synandrodia with the staminodes incompletely fused; male zone ca. 4 cm long, much expanded (ca. 2 cm diam.) in the part distal to the spathe constriction, below the spathe constriction ca. 1.2 cm diam;

Synandria rhombohexagonal, 1.5-2 mm diam., ivory, with the thecae overtopped by the synconnective; appendix dirty pale yellow to ivory, shghtly constricted at base, narrower than distal part of male zone, tapering gradually to a fine point; fruiting spathe whitish, sometimes borne quasi-laterally in a ring on the trunk below the leaf crown and then pendulous, the spathe dehiscing longitudinally; fruits reddish orange, rather small, ca. 4 mm diam., mostly single-seeded.

Buying Alocasia robusta from Javaniska Elflora

Welcome to Javaniska Elflora’s website. Our stock contains seeds, plant and tubers in various size, offset tubers or bulbs. We sometimes offer our mother plants in the shop section.

If you have questions or need further information about the species, tips on planting, complains on shipment, please contact us directly to our email javaniska.elflora@gmail.com or contact our whatsapp admin for fast response. Thank you all.

We have other species available here. You can also contact our Whatsapp admin to get further information about this species.

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