| ┌1A. | Leaf blades not peltatePeltate: 
in adult plants .. 2
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| │ | ┌2A. | Secondary venationVenation: The arrangement of veins in the leaf.
distinctly prominent abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly and forming welldefined interprimary collective veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins. 
s .. 📌Alocasia sarawakensis
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| │ | ├2B. | Secondary venationVenation: The arrangement of veins in the leaf.
not prominent abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly, or, if prominent, then not forming well-defined interprimary collective veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s .. 3
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| │ | │ | ┌3A. | Leaf blade membranous, often immense, abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly waxy-glaucousGlaucous: Covered with a whitish powder or waxy coating.
.. 📌Alocasia robusta
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| │ | │ | ├3B. | Leaf blade of various sizes and textures, not waxy-glaucousGlaucous: Covered with a whitish powder or waxy coating.
(though sometimes abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly grey-green) .. 4
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| │ | │ | │ | ┌4A. | Male zone of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
completely exerted from lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
chamber (always in association with human disturbance) .. 📌Alocasia macrorrhizos
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| │ | │ | │ | ├4B. | Male zone of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
partly or wholly within lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
chamber (plants of natural forested habitats) .. 5
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| │ | │ | │ | │ | ┌5A. | Leaf blade narrowly to broadly ovato-sagittateSagittate: 
, nearly always stiffly leathery to subsucculent .. 6
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| │ | │ | │ | │ | │ | ┌6A. | Adaxial leaf blade grey-green and distinctly dark green about main veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s .. 7
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| │ | │ | │ | │ | │ | │ | ┌7A. | AbaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
leaf blade purple; anteriorAnterior: 
costa with c. 6 primary lateral veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s on each side, with conspicuous subsidiary veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s (geology & origin unknown) .. 📌Alocasia nebula
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| │ | │ | │ | │ | │ | │ | └7B. | AbaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
leaf blade not purple; anteriorAnterior:
costa with 2--3 primary lateral veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s on each side; subsidiary veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s absent (limestones: SE Sarawak) .. 📌Alocasia reversa
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| │ | │ | │ | │ | │ | ├6B. | Adaxial leaf blade of various colours but not variegated .. 8
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| │ | │ | │ | │ | │ | │ | ┌8A. | Inflorescence pairs solitary and secondary venationVenation: The arrangement of veins in the leaf.
adaxially impressed (limestones: Mulu) .. 📌Alocasia reginae
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| │ | │ | │ | │ | │ | │ | ├8B. | Inflorescence pairs clustered or if solitary then secondary venationVenation: The arrangement of veins in the leaf.
not impressed .. 9
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| │ | │ | │ | │ | │ | │ | │ | ┌9A. | PosteriorPosterior:
lobes ca 1/2 or more the length of the anteriorAnterior:
; blade stiffly leathery (lithophytic on or terrestrial in close association with limestone (limestones: SE Sarawak) .. 📌Alocasia ridleyi
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| │ | │ | │ | │ | │ | │ | │ | └9B. | PosteriorPosterior:
lobes less than to ca 1/2 the length of the anteriorAnterior:
; blade thickly coriaceousCoriaceous: Resembling or having the texture of leather.
to subsucculent; terrestrial and not especially associated with limestone (widespread in Borneo) .. 📌Alocasia scabriuscula
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| │ | │ | │ | │ | ├5B. | Leaf blade hastato-sagittateSagittate:
, triangular in outline, mostly rather thinly leathery .. 10
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| │ | │ | │ | │ | │ | ┌10A. | Plants terrestrial, not limestone associated .. 11
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| │ | │ | │ | │ | │ | │ | ┌11A. | PetiolePetiole: Leaf stem.
s mottled with wavy oblique zones of dense brown lines, occasionally scabrid; spatheSpathe: A large sheathing bract enclosing the flower cluster.
s mostly dusky brownish mauve, the limb darker; lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
narrowly ovoid; limb mostly narrowly lanceolateLanceolate: 
(Sabah) .. 📌Alocasia wongii
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| │ | │ | │ | │ | │ | │ | └11B. | PetiolePetiole: Leaf stem.
s variously and more or less haphazardly marked with lines and/or dots, smooth or occasionally faintly bumpy (glands), but not scabrid; spatheSpathe: A large sheathing bract enclosing the flower cluster.
s mostly ivory to yellowish ivory, variously marked or not with pink to purple, and/or purple-margined; lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
broadly ovoid; limb more or less oblongOblong: 
(widespread in Borneo) .. 📌Alocasia princeps
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| │ | │ | │ | │ | │ | ├10B. | Plants lithophytic on limestone .. 12
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| │ | │ | │ | │ | │ | │ | ┌12A. | Male zone of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
completely within lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
chamber; leaf blades distinctly grey-green adaxially (limestones: Sabah, E. Kalimantan) .. 📌Alocasia principiculus
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| │ | │ | │ | │ | │ | │ | ├12B. | Male zone of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
partly exsertedExserted: Protruded, stretched out, or (esp of stamens) projecting.
from lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
chamber; leaf blades dark to bright green adaxially (Sabah) .. 13
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| │ | │ | │ | │ | │ | │ | │ | ┌13A. | Leaf blade bright green adaxially; inner side of posteriorPosterior:
lobe ovateOvate: 
; male zone more or less adjunct to female zone or interstice short, not attenuate, formed of 1-2 whorls of synandrodia, resembling synandriaSynandria: Sets of stamens of which the anthers have been fused.
(limestones: Gua Madai) .. 📌Alocasia puteri
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| │ | │ | │ | │ | │ | │ | │ | └13B. | Leaf blade dark green adaxially; inner side of posteriorPosterior:
lobe ellipticElliptic: 
to narrowly ovateOvate:
; interstice elongate, partly naked, with neuter organs resembling staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s below and resembling synandriaSynandria: Sets of stamens of which the anthers have been fused.
above (limestones: Gua Madai) .. 📌Alocasia pangeran
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| ├1B. | Leaf blades distinctly (shallowly to completely) peltatePeltate:
in adult plants .. 14
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| │ | ┌14A. | Leaf blades + membranous and pendent, often solitary or only 2-3 together, often adaxially dark green with whitish major veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s (sometimes adaxially concolorous), often purple-backed, shallowly to deeply peltatePeltate:
; stigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
stellate with pointed lobes; interstice corresponding with spatheSpathe: A large sheathing bract enclosing the flower cluster.
constriction and male zone completely exerted .. 📌Alocasia longiloba complex (see Hay, 1998)
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| │ | ├14B. | Leaf blades variously coriaceousCoriaceous: Resembling or having the texture of leather.
, pendent or not, few to several together, deeply to almost completely peltatePeltate:
; stigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
not lobed or lobes rounded; interstice and part or all of male zone within lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
cham .. 15
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| │ | │ | ┌15A. | Leaf blades metallic greenish brown adaxially, bullate between primary veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s; lower primary veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s diverging at first at more than 90° (Sabah & NE Sarawak) .. 📌Alocasia cuprea
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| │ | │ | ├15B. | Not this combination .. 16
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| │ | │ | │ | ┌16A. | Adaxial leaf surface strongly and minutely rugoseRugose: Wrinkled; corrugated.
with the tertiary venationVenation: The arrangement of veins in the leaf.
raised (ultramafics: Sabah) .. 📌Alocasia melo
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| │ | │ | │ | ├16B. | Adaxial leaf surface smooth or with secondary venationVenation: The arrangement of veins in the leaf.
impressed .. 17
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| │ | │ | │ | │ | ┌17A. | Adaxial leaf laminaLamina: Leaf blade.
e very dark black-green with white impressed primary and secondary venationVenation: The arrangement of veins in the leaf.
; spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
with appendixAppendix: Sterile appendage at the end of a spadix.
reduced (limestone: Bukit Tabin) .. 📌Alocasia reginula
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| │ | │ | │ | │ | ├17B. | Adaxial leaf laminaLamina: Leaf blade.
e not variegated, or if variegated then main veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s and neighbouring blade darker than the rest; appendixAppendix: Sterile appendage at the end of a spadix.
well developed .. 18
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| │ | │ | │ | │ | │ | ┌18A. | Leaf blades with conspicuous intramarginal veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
and marginal veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
; laminaLamina: Leaf blade.
e broadly to narrowly ellipticElliptic:
, with the base cuneateCuneate: 
; male zone wholly within the lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
(above 800 m, Borneo) .. 📌Alocasia peltata
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| │ | │ | │ | │ | │ | ├18B. | Leaf blades with more or less conspicuous marginal veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
only; laminaLamina: Leaf blade.
e various; male zone wholly or partly within the lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
(mostly below 500m, Borneo) .. 19
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| │ | │ | │ | │ | │ | │ | ┌19A. | Primary lateral veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s numerous, 8-10 on each side of midrib; secondary venationVenation: The arrangement of veins in the leaf.
striate; in peat swamp forest (peat swamp forest: Sarawak) .. 📌Alocasia minuscula
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| │ | │ | │ | │ | │ | │ | ├19B. | Primary lateral veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s much fewer; secondary venationVenation: The arrangement of veins in the leaf.
clearly colocasioid, but not forming interprimary collective veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s .. 20
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| │ | │ | │ | │ | │ | │ | │ | ┌20A. | Leaf blades thickly coriaceousCoriaceous: Resembling or having the texture of leather.
to subsucculent; male zone of spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
within lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
chamber .. 21
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| │ | │ | │ | │ | │ | │ | │ | │ | ┌21A. | Leaf laminaLamina: Leaf blade.
e broadly ovato-ellipticElliptic:
, adaxially pale matt grey, abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly greenish white with conspicuous deep red axillary glands abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly; petiolePetiole: Leaf stem.
s puberulentPuberulent: Covered in soft, downy hairs.
; fruiting spatheSpathe: A large sheathing bract enclosing the flower cluster.
magenta (Kapit, evergreen upper hill forest on sandstones above 500 m asl) .. 📌Alocasia chaii
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| │ | │ | │ | │ | │ | │ | │ | │ | └21B. | Leaf blade narrowly ellipticElliptic:
to ovateOvate:
to narrowly obovateOvate:
, mid green above, slightly paler with inconspicuous pale green axillary glands; petiolePetiole: Leaf stem.
s glabrousGlabrous: Smooth. Free from hair or down.
fruiting spatheSpathe: A large sheathing bract enclosing the flower cluster.
pale green (NW Borneo, kerangas below 500 m) .. 📌Alocasia beccarii
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| │ | │ | │ | │ | │ | │ | │ | ├20B. | Leaf blades thinly coriaceousCoriaceous: Resembling or having the texture of leather.
or sub-membranous; male zone only partly included within the lower spatheSpathe: A large sheathing bract enclosing the flower cluster.
chamber .. 22
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| │ | │ | │ | │ | │ | │ | │ | │ | ┌22A. | LaminaLamina: Leaf blade.
e ascending (adult plants) to weakly spreading (juveniles), thinly and weakly coriaceousCoriaceous: Resembling or having the texture of leather.
, lustrous deep purple-black; petiolePetiole: Leaf stem.
s minutely puberulentPuberulent: Covered in soft, downy hairs.
; infructescences deflexed (Kapit: sandstones) .. 📌Alocasia infernalis
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| │ | │ | │ | │ | │ | │ | │ | │ | ├22B. | LaminaLamina: Leaf blade.
e pendent to weakly spreading (adult & juvenile plants), thinly, stiffly coriaceousCoriaceous: Resembling or having the texture of leather.
; never deep purple-black; petiolePetiole: Leaf stem.
s glabrousGlabrous: Smooth. Free from hair or down.
; infructescences erect (limestones) .. 23
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| │ | │ | │ | │ | │ | │ | │ | │ | │ | ┌23A. | Leaf blades dark green throughout and somewhat darker around midveinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s; inflorescences to ca 6 together; stigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
mostly tri-lobed (limestones: Gua Niah) .. 📌Alocasia venusta
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| │ | │ | │ | │ | │ | │ | │ | │ | │ | └23B. | Leaf blades grey-green and dark blue-green around veinVein: Venation types: A. midrib; B. primary lateral veins; C. interprimaray veins; D. secondary veins; E. collective veins; F. tertiary veins; G. basal ribs; H. basal veins.
s; inflorescences solitary to paired; stigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
mostly bi-lobed (limestones: SE Sarawak) .. 📌Alocasia reversa
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