Maybe this is a dumb question, but, - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 11-16-2006, 09:38 PM Thread Starter
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Maybe this is a dumb question, but,

How do I tell the difference between Sagittaria subulata and
Echinodorus tenellus?
The lfs told me it was dwarf sag, but it looks like it could be Echinodorus. Any ideas how to tell the difference?

I'm trying to think but nothing happens.
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post #2 of 6 (permalink) Old 11-16-2006, 10:56 PM
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Hard to tell between the two at the early stage...

Sagittaria subulata will grow larger than Echinodurus tenellus.

Echinodurus t. is spose to be the smallest of the species. it would be pretty hard to tell. Sagittaria sub. likes a lil harder water, where the later will do fine in slightly more acidic water.

I guess if yer water is soft, Sagittaria sub might not grow as well. If they are thriving, then echinodurus t. is prolly what ya got...

Then again, sag sub with c02, an ferts would be just fine in soft or hard water...

Bottom line is just plant them an see how they grow!
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post #3 of 6 (permalink) Old 11-16-2006, 11:28 PM Thread Starter
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Thanks bastalker. They are all small. I was hoping to have the sag so that when the tank cycles, I could replace them. If they are Echinodurus I would feel bad. But if you say it is hard to tell when they are young than maybe I have the right ones.

I'm trying to think but nothing happens.
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post #4 of 6 (permalink) Old 11-18-2006, 09:30 AM
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THe easiest way to tell them apart is to try and press the leaves gently between 2 fingers. The sags have a thickness (fleshiness) to their leaves and the leaves sort of spongy especially near the crown. Echinodorus leaves are evenly thin. The dwarf sag leaves also curve a bit down at their tips and the leaves are rather stiff (so that you can almost keel over the plant by lifting one leaf only). Echinodorus leaves have some resistance but the whole rosette is not affected as much...
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post #5 of 6 (permalink) Old 11-18-2006, 01:04 PM
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From what i observed,sags are generally more rounded at the tips as compared to e.tenellus which is more needle like.
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post #6 of 6 (permalink) Old 11-18-2006, 01:16 PM
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Oh yes, I concur with Y0uH0!
E. tenellus has really narrow (~1-2 mm wide) submersed leaves as opposed to wider leaves (~5-7 mm) of S. subulata. But if the plants are rather fresh from the LFS, the Echi might still have the emersed leaves that are more 'spoon-shaped', ie. the leaf blade can be told apart from the petiole.
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