Key to the Species Complexes of Bornean Homalomena


Based on Wong, Hoe, Soon & Boyce ( Aroideana V36, 2012 )

Click on 📌 to highlight and compare characteristics.
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1A. Stoloniferous colonial helophyteHelophyte: A bog plant; especially a perennial marsh plant having its overwintering buds under water. s .. 2
2A. SpatheSpathe: A large sheathing bract enclosing the flower cluster. not divided into a lower and upper portion by a constriction; staminate and pistilPistil: The female reproductive part of a flower. late flower zones separated by a conspicuous naked interstice .. 📌Expedita Complex
2B. SpatheSpathe: A large sheathing bract enclosing the flower cluster. divided into a lower and upper portion by a constriction; staminate and pistilPistil: The female reproductive part of a flower. late flower zones contiguous .. 📌Rostrata Complex
1B. Solitary or clumping terrestrial or lithophytic mesophytes .. 3
3A. SpatheSpathe: A large sheathing bract enclosing the flower cluster. not divided into a lower and upper portion by a constriction; stamenStamen: The pollen-producing reproductive organ of a flower. s without a conspicuous, flat connective; leaf blades abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly with conspicuous pellucidPellucid: Translucently clear. striate 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. -like glands running parallelParallel: Parallel Venation. to the 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 .. 📌Selaburensis Complex
3B. SpatheSpathe: A large sheathing bract enclosing the flower cluster. divided by a weak to pronounced constriction into a welldefined upper (limb) and a lower portion; stamenStamen: The pollen-producing reproductive organ of a flower. s with a conspicuous flat connective; leaf blades lacking pellucidPellucid: Translucently clear. 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. -like glands (if present, then leaf blades lacking posteriorPosterior: lobes, weakly peltatePeltate: , and interpistilPistil: The female reproductive part of a flower. lar staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther. s absent or leaf blades cordiform and interspistilPistil: The female reproductive part of a flower. lar staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther. s present) .. 4
4A. Leaf blades abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly with pellucidPellucid: Translucently clear. 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. -like glands .. 5
5A. Leaf blade weakly peltatePeltate: , lacking posteriorPosterior: lobes, blade pendulous from the petiolePetiole: Leaf stem. ; petiolar sheath margins persistentPersistent: Remaining attached to the plant beyond the usual time of falling. ; interpistilPistil: The female reproductive part of a flower. lar staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther. s absent .. 📌Havilandii Complex
5B. Leaf blade cordiform, spreading; petiolar sheath with margins marcescentMarcescent: Withering but remaining attached to the stem. ; interpistilPistil: The female reproductive part of a flower. lar staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther. s present .. 📌Wongii Complex
4B. Leaf blade without pellucidPellucid: Translucently clear. striate 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. -like glands .. 6
6A. Lower spatheSpathe: A large sheathing bract enclosing the flower cluster. longer than spatheSpathe: A large sheathing bract enclosing the flower cluster. limb .. 7
7A. Leaf blade rubbery, cordiform, glossy bright green, 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 rather numerous; staminate flower zone producing amber-coloured resin droplets .. 📌Giamensis Complex
7B. Leaf blade leathery, with little or no posteriorPosterior: lobe development, base broadly truncate, often adaxially matte medium green, and weakly glaucousGlaucous: Covered with a whitish powder or waxy coating. abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf). ly; 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 few; staminate flower zone not producing resin droplets .. 📌Borneensis Complex
6B. SpatheSpathe: A large sheathing bract enclosing the flower cluster. limb longer than or equalling lower spatheSpathe: A large sheathing bract enclosing the flower cluster. .. 8
8A. Leaf blade cordateCordate: -sagittateSagittate: , somewhat to much quilted between the 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, adaxially with scattered conspicuous punctatePunctate: Dotted with minute pits or translucent dots. glands; petiolar sheath margins soon marcescentMarcescent: Withering but remaining attached to the stem. (observe leaf immediately below flowering event); staminate flower zone (almost always) producing amber-coloured resin droplets; interpistilPistil: The female reproductive part of a flower. lar staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther. s present .. 📌Hanneae Complex
8B. Leaf blade oblongOblong: to oblongOblong: -ellipticElliptic: , not quilted, and lacking punctatePunctate: Dotted with minute pits or translucent dots. glands; petiolar sheath persistentPersistent: Remaining attached to the plant beyond the usual time of falling. ; staminate flower zone without resin; interpistilPistil: The female reproductive part of a flower. lar staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther. s absent .. 📌Insignis Complex
 


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