| ┌1A. | Two types of staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s, upper clearly of different shape or reduced compared to the lower ones .. 2
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| │ | ┌2A. | SpatheSpathe: A large sheathing bract enclosing the flower cluster.
tube fused; 3-5 bulbils in the lower part of the petiolePetiole: Leaf stem.
.. 📌Sauromatum gaoligongense
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| │ | ├2B. | SpatheSpathe: A large sheathing bract enclosing the flower cluster.
tube convoluteConvolute: The process of convolute vernation involves the wrapping of one margin of the leaf's blade over the other. This folding mechanism makes the emerging leaf look like a tube.
.. 3
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| │ | │ | ┌3A. | Lower staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s clearly clavateClavate: Club-shaped; thicker at the apex than at the base.
.. 4
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| │ | │ | │ | ┌4A. | Leaves simple, ovateOvate: 
, cordateCordate: 
to hastateHastate: 
; upper staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s smaller than the lower ones, subulate or occasionally ab- sent .. 📌Sauromatum giganteum
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| │ | │ | │ | └4B. | Leaves pedatisect; upper staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s filiform, gradually shorter towards the male zone .. 📌Sauromatum horsfieldii
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| │ | │ | │ | └3B. | Lower staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s clavateClavate: Club-shaped; thicker at the apex than at the base.
/spathulate, clavateClavate: Club-shaped; thicker at the apex than at the base.
part anvil shaped or dorso-ventrally flattened, dark purple; upper staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s narrowly spindle shaped, whitish .. .. 📌Sauromatum tentaculatum
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| ├1B. | Only one type of staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s, upper sterile part longitudi- nally grooved and roughened with projections or processes, or naked .. 5
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| │ | ┌5A. | SpatheSpathe: A large sheathing bract enclosing the flower cluster.
tube free; leaf blade simple and ovateOvate:
-lanceolateLanceolate: 
, cuneateCuneate: 
to hastateHastate:
3-5-lobed or 5-9-foliolate pedatisect; upper sterile part of the spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
naked or with apiculate projections .. 📌Sauromatum diversifolium
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| │ | ├5B. | SpatheSpathe: A large sheathing bract enclosing the flower cluster.
tube fused, at least basalBasal: Forming or belonging to a bottom layer or base.
part .. 6
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| │ | │ | ┌6A. | PetiolePetiole: Leaf stem.
and leaf blade with hairs; upper sterile part of the spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
axis completely naked .. 7
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| │ | │ | │ | ┌7A. | Hairs distinct and long; also outside surface of spatheSpathe: A large sheathing bract enclosing the flower cluster.
cov- ered with hairs .. 📌Sauromatum hirsutum
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| │ | │ | │ | └7B. | Hairs short (ca 0.5 mm); outside surface of spatheSpathe: A large sheathing bract enclosing the flower cluster.
smooth .. 📌Sauromatum brevipilosum
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| │ | │ | ├6B. | PetiolePetiole: Leaf stem.
and leaf blade without hairs, upper sterile part of the spadixSpadix: A spike of minute flowers closely arranged around a fleshy axis and typically enclosed in a spathe.
axis rough, shaggy or with minute processes (highly reduced staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s) .. 8
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| │ | │ | │ | ┌8A. | Leaflets oblongOblong: 
-lanceolateLanceolate:
, apexApex: End forming a point.
acuminateAcuminate: Tapering to a point.
; inflorescence up to 40 cm long; spatheSpathe: A large sheathing bract enclosing the flower cluster.
tube dark purple inside, spatheSpathe: A large sheathing bract enclosing the flower cluster.
blade inside maculate .. 📌Sauromatum venosum
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| │ | │ | │ | └8B. | Leaflets linearLinear: 
-lanceolateLanceolate:
, apexApex: End forming a point.
long acuminateAcuminate: Tapering to a point.
; lower clavateClavate: Club-shaped; thicker at the apex than at the base.
staminodeStaminode: A sterile or abortive stamen, frequently resembling a stamen without its anther.
s white, upper minute processes purple; inflorescence max. 7.5 cm long; spatheSpathe: A large sheathing bract enclosing the flower cluster.
tube inside green- ish to white, spatheSpathe: A large sheathing bract enclosing the flower cluster.
blade inside not maculate, dull purple basalBasal: Forming or belonging to a bottom layer or base.
ly and pink above .. 📌Sauromatum brevipes
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