| ┌1A. | Sterile interstice between pistilPistil: The female reproductive part of a flower.
late and staminate flower zones well-defined
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| │ | ┌2A. | Stem short, erect; spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
thick (width of pistilPistil: The female reproductive part of a flower.
late zone: entire length 5 5/18); pistilPistil: The female reproductive part of a flower.
late zone green, staminate zone pale yellow; N Borneo (Sarawak: Limbang, Brunei, W Sabah) .. 📌Piptospatha burbidgei
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| │ | └2B. | Stem long, repent, spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
slender (width of pistilPistil: The female reproductive part of a flower.
late zone: whole length 5 3/30), pink; N Kalimantan Tengah .. 📌Piptospatha repens
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| ├1B. | Sterile interstice absent or very ill-defined .. 3
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| │ | ┌3A. | AntherAnther: The part of a stamen that contains the pollen.
connective extended into a pronounced elongate beak; "North Borneo" .. 📌Piptospatha insignis
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| │ | ├3B. | AntherAnther: The part of a stamen that contains the pollen.
connective not so, or if elevated then shortly so and obtuse .. 4
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| │ | │ | ┌4A. | AntherAnther: The part of a stamen that contains the pollen.
s pubescentPubescent: With a hairy surface.
.. 5
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| │ | │ | │ | ┌5A. | Connective of stamenStamen: The pollen-producing reproductive organ of a flower.
swollen, dome-like; S Peninsular Malaysia .. 📌Piptospatha ridleyi
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| │ | │ | │ | ├5B. | Connective not swollen, flat .. 6
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| │ | │ | │ | │ | ┌6A. | SpatheSpathe: A large sheathing bract enclosing the flower cluster.
white; antherAnther: The part of a stamen that contains the pollen.
s in closely appressed regularly arranged pairs; leaf blade with conspicuously tessellate tertiary venationVenation: The arrangement of veins in the leaf.
on both surfaces; Malay Peninsula and S peninsular Thailand .. 📌Piptospatha perakensis
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| │ | │ | │ | │ | ├6B. | SpatheSpathe: A large sheathing bract enclosing the flower cluster.
pink; antherAnther: The part of a stamen that contains the pollen.
s irregularly arranged; leaf blade without tessellate venationVenation: The arrangement of veins in the leaf.
, or if present then only very faint and only abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly; Borneo .. 7
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| │ | │ | │ | │ | │ | ┌7A. | Robust plants to 25 cm tall with short, erect stems; leaves forming a rosette; leaf blade very narrowly oblongOblong: 
-ellipticElliptic: 
, 12-20 cm long, all 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 parallelParallel: Parallel Venation.
pinnatePinnate: Pinnate Venation.
; spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
ca. 2 cm long; pistilPistil: The female reproductive part of a flower.
late flower zone fertile to the base; fruiting spatheSpathe: A large sheathing bract enclosing the flower cluster.
2.5 cm long and wide; plants of exposed shales; Sarawak: Rejang valley .. 📌Piptospatha marginata
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| │ | │ | │ | │ | │ | └7B. | Diminutive plants up to 14 cm tall with decumbent-creeping stems; leaves loosely clustered, or distributed along the stem; leaf blade ellipticElliptic:
, 4-6 cm long, tertiary venationVenation: The arrangement of veins in the leaf.
abaxialAbaxial: Facing away from the stem of a plant (especially denoting the lower surface of a leaf).
ly forming a very faint tessellate reticulum; spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
0.8-1.2 cm long, pistilPistil: The female reproductive part of a flower.
late flower zone with 3-5 oblique whorls of staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s at the base; fruiting spatheSpathe: A large sheathing bract enclosing the flower cluster.
up 1 cm long and wide; plants of travertine; Kalimantan Timur: Sangkulirang .. 📌Piptospatha manduensis
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| │ | │ | ├4B. | AntherAnther: The part of a stamen that contains the pollen.
s glabrousGlabrous: Smooth. Free from hair or down.
.. 8
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| │ | │ | │ | ┌8A. | SpadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
bullet-shaped, the staminate portion tapering towards the apexApex: End forming a point.
; lower part of staminate zone comprised of larger flowers, that may be sterile, intermixed adjacent to the pistilPistil: The female reproductive part of a flower.
s with white staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s; thecaeThecae: One of the lobes of an anther in which pollen is produced.
broadly excavated, the excavations of adjacent antherAnther: The part of a stamen that contains the pollen.
s forming a butterflyshaped depression; stigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
s bright green; spatheSpathe: A large sheathing bract enclosing the flower cluster.
at anthesisAnthesis: The period during which pollen is presented and/or the stigma is receptive.
shading proximally to distally from deep olive-green through very pale pink to medium pink, the interior of the spatheSpathe: A large sheathing bract enclosing the flower cluster.
tip rostrum with 5-7 conspicuous keels; persistentPersistent: Remaining attached to the plant beyond the usual time of falling.
fruiting spatheSpathe: A large sheathing bract enclosing the flower cluster.
wide-flared; plants frequently limestone associated; SW Sarawak (? NW Kalimantan) .. 📌Piptospatha viridistigma
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| │ | │ | │ | ├8B. | SpadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
cylindrical; staminate flowers uniform throughout zone; thecaeThecae: One of the lobes of an anther in which pollen is produced.
longitudinally sulcateSulcate: Furrowed; grooved.
with the pores ventral and dorsal to the sulcae; stigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
s pink or dirty whitish. SpatheSpathe: A large sheathing bract enclosing the flower cluster.
at anthesisAnthesis: The period during which pollen is presented and/or the stigma is receptive.
shading proximally to distally from deep plum purple through medium pink to deep pink, the interior of the spatheSpathe: A large sheathing bract enclosing the flower cluster.
tip rostrum with 2-3 conspicuous keels or keels 6 absent. PersistentPersistent: Remaining attached to the plant beyond the usual time of falling.
fruiting spatheSpathe: A large sheathing bract enclosing the flower cluster.
narrowly obconic; plants of sandstone or granite .. 9
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| │ | │ | │ | │ | ┌9A. | StigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
s mid-deep pink; antherAnther: The part of a stamen that contains the pollen.
s with connective flat; spatheSpathe: A large sheathing bract enclosing the flower cluster.
tip rostrum almost straight or only weakly reflexed (ca. 45u) relative to spatheSpathe: A large sheathing bract enclosing the flower cluster.
axis at anthesisAnthesis: The period during which pollen is presented and/or the stigma is receptive.
, inside with 2-3 conspicuous longitudinal keels; plants exclusively of granite; NW Borneo .. 📌Piptospatha elongata
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| │ | │ | │ | │ | └9B. | StigmaStigma: The receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.
s dirty whitish; antherAnther: The part of a stamen that contains the pollen.
s with a short acute-triangular connective on each side, spatheSpathe: A large sheathing bract enclosing the flower cluster.
tip rostrum strongly reflexed (ca. 130u) relative to spatheSpathe: A large sheathing bract enclosing the flower cluster.
axis at anthesisAnthesis: The period during which pollen is presented and/or the stigma is receptive.
, inside lacking keels, or keels only very vaguely defined; plants exclusively of sandstone; NW Sarawak .. 📌Piptospatha impolita
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