Aponogeton

Aponogeton appendiculatus H.Bruggen (Images by Sushant More (Inserted by J.M.Garg) (For more images & complete details, click on the links))
Aponogeton bruggenii S.R.Yadav & Govekar (Images by Dinesh Valke (Inserted by J.M.Garg) (For more images & complete details, click on the links))

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Aponogeton satarensis Sundararagh., A.R.Kulk. & S.R.Yadav (Images by Adesh Shivkar, Pravin Kawale, Dinesh Valke & Prashant Awale (Inserted by J.M.Garg) (For more images & complete details, click on the links))

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As per efi thread :
Aponogeton: perianth 1-3, white membranous, stamens 6 or more
Potamogeton: perianth 4, green, herbaceous, stamens 4, opposite
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Pl. go through Aponogeton page (‎‎‎‎Aponogetonaceae) with images of species in efloraofindia (done by me).

If you find any mis-identification, pl. let us know.
If anybody can send images of other species of this genera (for incorporation in the website), it will be really nice. Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.

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Aponogeton bruggenii (Maharashtra- Sindhudurg district)
Aponogeton echinatus (A.P., Karnataka, Kerala, Maharashtra & Tamilnadu)
Aponogeton natans (A.P., Karnataka, Kerala, Maharashtra, Odisha & Tamilnadu)
Aponogeton satarensis (Maharashtra- Satara & Ratnagiri district)
Aponogeton undulatus (Karnataka, Maharashtra & Odisha)