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I'd actually guess that it was C. moehlmannii since the undersides of the leaves are the same green as the tops. C. pontederiifolia grown in bright light typically has a pink to violet underside. I'm guessing on the bright light based on the size of the plant pictured.
 

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I have both too and the flower looks to long in the tube to be pontederiifolia.

Does your plant still have the flower? How long is the tube, it's about the only characteristic that is easily dissernable between the two plants.
 

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tsunami said:
Cryptocoryne pontederiifolia, because of the yellow flower.

C. moehlmannii would have a very dark flower.

Carlos
Does Kasselmann's book have it wrong?
 

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SCMurphy said:
Does Kasselmann's book have it wrong?
C. moehlmannii:

"Marsh plant with a creeping rhizome, 10-30 cm tall. Leaves 5-15(-20) cm long petiolate. Blade lanceolate to narrow ovate, 10-15 cm long and 3.5-7 cm wide, smooth or slightly bullate. Apex acute and base slightly to distinctly cordate. Margin entire. Light to olive green coloration, not brownish.

Spathe 4-6 cm long. Tube 0.5-1 cm long. Limb 3-3.5 cm long, cuspidate, more or less erect (form from Tapaktuan) or 1-2 times obliquely twisted (form from Sasok), mamillate, interior dark purple-red. Collar narrow. Throat and collar colored similarly to the limb. Female flowers 5. Male flowers 25-30. Number of chromosomes 2n = 30."

C. pontederiifolia:

"Marsh plant, 10-40 cm tall. Blade lanceolate to narrow ovoid, 9-14 cm long, 3-8 cm wide, smooth or slightly bullate, light to olive green, occasionally brownish or mild violet. Apex acute; base usually cordate.

Spathe 4-7 cm long. Tube up to 0.5 cm long. Limb 1.5-5 cm, cuspidate, erect or recurved, little twisted, rough to slightly wrinkly, interior yellow or reddish. Collar wide, smooth to a little rough, coloring like the limb. Female flowers 5-6. Male flowers 20-35. Number of chromosomes 2n = 30."
 

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As per Jan D. Bastmeijer's site....

Cryptocoryne pontederiifolia inflorescence:


Cryptocoryne moehlmannii inflorescence:


I have specimens of both species, emersed, under 2x55w PC lighting. The C. pontederiifolia has never produced violet/purple undersides. The foliage of both species is strikingly similar.

Carlos
 
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