... has posted six species of Alternanthera recently.
He has also stated in one of the threads that "... the Alternanthera species on our databases need to be sorted out...".

In view may I request the members to pl. have a re-look at their Alternanthera species in Indiantreepix Database or otherwise & post them for sorting out in case they have any doubts.

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Id confirmation has to be made by looking at all the characters.
The thread is open for suggestions and corrections if any......................
1) Colour of leaves red brown; cultivated garden plant........A.brasiliana
2) Sessile linear leaves...................................................A.sessilis
3) Plant carpet like; leaves orbicular or ovate3*3cm...........A.pungens
4) ...................similar....not much info............................A.pulchella
5) Erect tufted herbs; small petiole................................A.ficoidea or
Erect branched herb ................................................A.bettzichiana
.................may be syn..As per BSI Mah.......................A.tenella var.versicolour
6) Aquatic herb; flowers in globose heads........................A.philoxeroides.
This is an humble attempt some corrections might erupt..

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Trying to keep it as simple as possible (but also fearing technical differences may get blurred) for easy identification:

1. Inflorescence a head on raised stalk

     2. Plants with thick reddish leaves, atleast ¾ as broad as long; cultivated as  hedge/border plant  ...1. A. brasileana (incl. A. dentata)

     2. Leaves not reddish, less than ½ as broad as long; wild plant of moist or aquatic habitats.  ….2. A.philoxeroides.

1. Inflorescence a sessile head in leaf axils

        3. Plants prostrate, mat-forming

             4. Leaves atleast ¾ as broad as long, stems and leaves rigid; flowers (tepals) spine-tipped ……3. A. pungens

             4. Leaves usually less than ½ as broad as long, stems and leaves soft; flowers (tepals) not spin-tipped …..4. A. paronychoides

      3. Plants erect or spreading not mat-forming

5. Leaves sessile, linear or narrowly oblanceolate; plant of moist or wet situations …. 5. A. sessilis

5. Leaves with distinct petiole; mostly cultivated

    6. Leaves green or tinged with purple; mostly oblanceolate, gradually narrowed into petiole, less than ½ as broad as long …….6. A. bettzickiana (incl. A. amoena and A. versicolor)

    6. Leaves green, not tinged with purple; mostly elliptic-ovate, more than ½ as broad as long, more sharply narrowed into short petiole…………………..……………...7. A. ficoidea