Colocasia mannii

Colocasia mannii Hook.f., Fl. Brit. India 6: 524 1893.;
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Assam; Bangladesh; Nicobar Is. as per CoL;
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Hook. f. ; leaves oblong-ovate base sagittate lobes very obtuse sinus broad acute, spathe narrowly oblong cymbiform, spadix half as long as the spathe sub-acute, appendage 0.
UPPER ASSAM ; at Makum, Mann.
Leaves 8-12 by 4-7 in., nerves 6-7 pairs, not stout, basal lobes 4 in. ; petiole 1-3 ft. Peduncle rather slender. Spathe 6-7 in., tube 1 in. Spadix 1.1/2-4 in. ; male infl. 1 in. intermediate space 1/2 in. ; male 1.1/4-1.1/2, tip rounded. Anthers stellately crenate. Ovaries globose, stigma a discoid area.
(Attributions- IBIS Flora (Flora of British India))
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MSJune,2015/06 Araceae : 6 posts by 3 authors. Attachments (2)

Location : Buarpui – W.Bungtlang road
Date : 24/06/2015
Habit : Herb
Habitat : Wild in the forests

Calla lily. Could be a species of Zantedeschia (Zantedeschia aethiopica ?)

I am unable to identify it. Please upload details of open spadix as in – efi thread

Colocasia esculenta ?

I think looks different from Colocasia esculenta

Alocasia acuminata ?

Inflorescence looks different as per images at IAS

I think, it would be Alocasia fallax Schott – POWO and https://www.gbif.org/species/5329901

The species is confined in Sikkim Himalaya and Khasia, as per F-B-I.
Unfortunately, neither the F-B-I nor the internet provides me details on flower/spadix.

As per F-B-I, vol-6, page 527, the species should be near A. decipiens & A. fornicata.

I am not convinced about it being Alocasia fallax as per GBIF  specimens or Alocasia decipiens as per GBIF.
What I see here is shining leaves with clear tertiary veins and contrasting colours of both sides of the leave, as can be seen in GBIF specimens of Alocasia fornicata at one, two, three, four, five, six. It also have distribution in the area as per POWO.
However, I am not sure.
Pl. confirm or otherwise.

Please send me the flower to examine physically.

I know I am asking for too much! Please understand that I am no expert on Alocasia or Colocasia, I am here too to learn something about plant-world. However, I do know what a flower of A. fornicata look like. And I believe that identification based on leaf morphology can mislead, specially in case of Alocasia or Colocasia.
I have doubt if your plant can be Alocasia fornicata – flowers are not like the ones I see here.- (a) floral chamber and spathe appear to be narrower and more elongated in your species, (b) spadix is different.
I do not know if the above characters can be regional variation.
I attach here description of Alocasia fornicata from the booh, “Botany of Bihar and Orissa”.
Also attached an edited picture for your perusal, along with other pictures (one immature flower and the other mature) of Alocasia fornicata flower that I recorded.

And KEY is there in a private mail for certain spp of Alocasia.

I would like to add one more point – I never came across any such phrase that “shiny leaf means Alocasia.”

I think it may be some Remusatia species as per comparative images herein, mostly Remusatia hookeriana Schott as per details and images herein and as per Flora of China keys, FoC illustrations- one, two, three and GBIF specimens – one, two, three, four

I am not acquainted with this genus, Sir ji.

Yet, I do not think it can be Remusatia hookeriana -(1) as per Fl.Br.Ind., spathe max 2.5 inch, / 7 cm max.- FoC) (2) spadix max. 11+7+9 = 27 mm = 1 inch approx (check FoC).

The spadix in this thread looks much longer, though actual size can only be verified by Sawmliana ji.

To me relative size of spathe, ovule and leaves appears to be OK. Actually close up images (making them look appear large) has confused us, into thinking this to be an Alocasia.

Yes, Sir ji, photographic illusions are quite possible.

Sir ji, is there any possibility of Steudnera colocasioides ? Please check the spadix at –  Aroid pictures

I do not think so.

Is it flower or the leaves?

Ok Sir ji in this case you are correct –

It is not Alocasia – since its flower does not carry an appendix
It is not Steudnera – spathe is differentiated into two zones, and spadix indicates a constricted sterile zone above the floral chamber.

Now, I will check, later, if it can be Colocasia – colocasia can have reduced or no appendix. Thereafter I will go to Remusatia.

Sir ji, I fail to connect it with any Alocasia (no appendix in flower) / Colocasia / Steudnera, “Flora of China ” has to offer.

I fail to connect it to any Remusatia as well, – the exposed part of the spadix is significantly longer than the hidden part in spathe tube.

If this is the same plant as in the other thread – efi thread – which I think it is – then I am afraid we have to think outside Remusatia hookeriana.

This is Colocasia mannii Hook.f.

“A herb ….. stolon absent —— upper surface of leaf blade glossy green ……. spadix 9-11 cm., …. female zone 3-3.8 cm., sterile zone 3cm., male zone 3-4.2 cm., synandria ivory ….”
So, is the other thread, spathe limb and male + strile + synandria decayed showing only fruiting chamber since that was photographed in September – efi thread
Don’t ask me where did I otain the data from – obviously I copied from somewhere!!!

Don’t redirect me to Indiabiodiversity site.

Hope you are right as per GBIF– specimens one and two.
Description from FBI from IBIS Flora is as below:
Hook. f. ; leaves oblong-ovate base sagittate lobes very obtuse sinus broad acute, spathe narrowly oblong cymbiform, spadix half as long as the spathe sub-acute, appendage 0.
UPPER ASSAM ; at Makum, Mann.
Leaves 8-12 by 4-7 in., nerves 6-7 pairs, not stout, basal lobes 4 in. ; petiole 1-3 ft. Peduncle rather slender. Spathe 6-7 in., tube 1 in. Spadix 1.1/2-4 in. ; male infl. 1 in. intermediate space 1/2 in. ; male 1.1/4-1.1/2, tip rounded. Anthers stellately crenate. Ovaries globose, stigma a discoid area.

Colocasia mannii

I am happy that your species id has been resolved. Please do not bother to send me any flower. I remember your difficulties.
I expect, in the coming days, you will offer us more and more uncommon or lesser-known species from your region. Please record as much detail of your plants as you can.

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Alocasia sp. for ID (Araceae) : 4 posts by 3 authors. Attachments (4).

Location : Sairang, Mizoram
Date : 01-09-2014
Habit : Herb
Habitat :Grows wild in shady place

Alocasia acuminata Schott (inflorescence usually solitary)?

same alocasia ?

For the same reason as I have explained in your thread I suggested it to be A. acuminata. But again I request you to check the population, for you should have A. acuminata, A. fallax (according to Hooker similar to A. fornicata; maybe A. navicularis as per http://www.aroid.org/aroidl-archive/showthread.php?id=724).

Again, it should be Alocasia fallax Schott.

I am not convinced about it being Alocasia fallax as per GBIF specimens or Alocasia decipiens as per GBIF.

What I see here is shining leaves with clear tertiary veins and contrasting colours of both sides of the leave, as can be seen in GBIF specimens of Alocasia fornicata at one, two, three, four, five, six. It also have distribution in the area as per POWO.
However, I am not sure.

Pl. confirm or otherwise.

Please send me the flower to examine physically.


I know I am asking for too much! Please understand that I am no expert on Alocasia or Colocasia, I am here too to learn something about plant-world. However, I do know what a flower of A. fornicata look like. And I believe that identification based on leaf morphology can mislead, specially in case of Alocasia or Colocasia.
I have doubt if your plant can be Alocasia fornicata – flowers are not like the ones I see here.
I do not know if there can be regional variation.
I attach here description of Alocasia fornicata from the booh, “Botany of Bihar and Orissa”.
Also attached an edited picture for your perusal.
2 attachments

I think it may be some Remusatia species as per comparative images herein, mostly Remusatia hookeriana Schott as per details and images herein and as per Flora of China keys, FoC illustrations- one, two, three and GBIF specimens – one, two, three, four

Again, Sir, the floral chamber(s) in the 3rd pic seems longer and cylindrical than all the references you have linked. However there might be some possibility which can not be confirmed without seeing the spadix.

Pl. see them in 2nd image, which shows their relative size compared to the leaves.

Again, I would say that please compare the probabilities with these illustrations- Steudnera illustrations