Alocasia and Xanthosoma : a query

65 views
Skip to first unread message

surajit koley

unread,
Sep 4, 2014, 1:01:30 PM9/4/14
to efloraofindia
In a recent thread I and Pudji Ji have initiated a discussion on a certain aroid member. This is the first time I come across the genus Xanthosoma. I searched for the genus in FI, FBI, BP, BoB&O, even I tried with synonyms of Xanthosoma sagittifolium, but to no avail. Searched the internet, again couldn't find much info. Specially regarding the species distribution of Xanthosoma in our country, India.

In fact very little documents can be found on Xanthosoma related to India. One doc., related to antioxidants in X. sagittifolium, informs that the authors collected the specimen from Western Ghats. EFI has two, one from Coimbatore and the other from Uttarakhand. Bangladesh also reports presence of Xanthosoma spp.

An old, yet interesting document on Alocasia macrrorhiza and other species can be found at - http://137.132.71.21/dna/docs/cf944ffddd72f5381003c0758c52dc83.pdf which informs the author did receive Xanthosoma material from Calcutta. It is further more interesting that FoC or FoP or even FoNA doesn't feature Xanthosoma.

Morphological difference, based on leaf characters, between Alocasia and Xanthosoma can be found in a few website. But those authors themselves are not very sure about the differences they have recorded there!

Yet, I think we might have some Xanthosoma hidden in the posts submitted to eFI, recently or in past.

Many thanks to Pudji Ji for drawing my attention to a new line of thought.

In this pretext I would request members+moderators to please provide species list of Xanthosoma found in India and their identifying characters.

Thank you

Regards

surajit koley

unread,
Sep 4, 2014, 10:15:04 PM9/4/14
to efloraofindia, Pudji Widodo
In continuation with the discussion in the other thread, with Pudji Ji, I would request to draw attention to few posts, first the cases I have submitted so far. It is to be noted that the identities of Alocasia indica Schott and A. macrorrhiza Schott (of BP or BoBO) are not clear to me. I take those are synonymous.


Another one that I have recorded recently https://groups.google.com/forum/#!topic/indiantreepix/tyNUNT6diR8 may be Xanthosoma.

I request all to record your views.

Thank you

Regards

surajit koley

unread,
Sep 5, 2014, 11:38:04 AM9/5/14
to efloraofindia
This is what I know as Alocasia fornicata (Roxb.) Schott. I think the plant features satisfy FI, FBI, BP, BoBO and Wight illustration T.792.

Since this plant, photographed today, is growing on a wall it is rather a small one and the stock is visible. In all previous cases I have never seen the stock above the ground level. Of-course they do not get a free hand to grow undisturbed though no part of this Alocasia is edible.

My next post will be another Alocasia.

Thank you

Regards

A-_fornicata_P1110791.jpg
A-_fornicata_P1110789.jpg
A-_fornicata_P1110794.jpg
A-_fornicata_P1110796.jpg
A-_fornicata_P1110798.jpg

surajit koley

unread,
Sep 5, 2014, 11:46:21 AM9/5/14
to efloraofindia
This is what I know as Alocasia indica Schott. Again I have never seen stock growing above the ground, for they are often cut and used for several purpose.

Thank you

Regards
A_indica_P1110778.jpg
A_indica_P1110780.jpg
A_indica_P1110781.jpg
A_indica_P1110782.jpg
A_indica_P1110786.jpg

surajit koley

unread,
Sep 5, 2014, 11:54:51 AM9/5/14
to efloraofindia
Now, this is the third plant. What would be its identity?

Thank you

Regards

P1110766.jpg
P1110767.jpg
P1110768.jpg
P1110770.jpg
P1110773.jpg
P1110774.jpg
P1110775.jpg
P1110776.jpg

surajit koley

unread,
Sep 7, 2014, 2:32:50 AM9/7/14
to efloraofindia
The third plant in this thread is definitely Xanthosoma species, possibly Xanthosoma sagittifolium (L.) Schott. Attached here detail photographs of its flower.

In this set of photographs I have marked two plates. Please correct me if I am wrong. The last plate features leaves of A. fornicata(top-left), C. esculenta (top-right) and the plant in question, Xanthosoma (bottom).

Again I thank Pudji Ji for his immense help, but his points regarding the difference between Alocasia, Colocasia and Xanthosoma, in the following threads, are still unclear to me -

Thank you

Regards
DSCN9059.jpg
DSCN9061.jpg
DSCN9065.jpg
DSCN9071.jpg
DSCN9073.jpg
DSCN9076.jpg
DSCN9077.jpg
DSCN9080.jpg
DSCN9085b.jpg
is this correct.jpg

J.M. Garg

unread,
Sep 13, 2014, 5:58:20 AM9/13/14
to efloraofindia, surajit koley

Forwarding again for any assistance in the matter please.


--
You received this message because you are subscribed to the Google Groups "efloraofindia" group.
To unsubscribe from this group and stop receiving emails from it, send an email to indiantreepi...@googlegroups.com.
To post to this group, send email to indian...@googlegroups.com.
Visit this group at http://groups.google.com/group/indiantreepix.
For more options, visit https://groups.google.com/d/optout.



--
With regards,
J.M.Garg

'Creating awareness of Indian Flora & Fauna'
The whole world uses
my Image Resource of more than a thousand species & eight thousand images of Birds, Butterflies, Plants etc. (arranged alphabetically & place-wise). You can also use them for free as per Creative Commons license attached with each image.

For identification, learning, discussion & documentation of Indian Flora, please visit/ join our Efloraofindia Google e-group (largest in the world- more than 2400 members & 2,00,000 messages on 9.9.14) or Efloraofindia website (with a species database of more than 10,000 species & 2,00,000 images). Winner of Wipro-NFS Sparrow Awards 2014 for efloraofindia

Also author of 'A Photoguide to the Birds of Kolkata & Common Birds of India'.

DSCN9059.jpg
DSCN9061.jpg
DSCN9065.jpg
DSCN9071.jpg
DSCN9073.jpg
DSCN9076.jpg
DSCN9077.jpg
DSCN9080.jpg
DSCN9085b.jpg
is this correct.jpg

surajit koley

unread,
Sep 19, 2014, 1:48:32 PM9/19/14
to J.M. Garg, efloraofindia
Leaves sagittate or not is not at all important, caudex also is less important to identify a Alocasia or Xanthosoma. It takes a detail of spadix to identify any Alocasia or Xanthosoma species. Otherwise the identification is bound to be wrong very often than not!

Since the spadix of this species doesn't have any appendix this is not Alocasia. But which Xanthosoma is it? Our group has expert(s) on Xanthosoma sagittifolium (L.) Schott .... who can identify the species merely by leaves! Ironically he/they is/are silent on this thread. The silence may mean that it is not X. s. .... or two more options I don't like to write here.

Unfortunately I do not have description of Xanthosoma robustum Schott, except http://www.hear.org/pier/species/xanthosoma_robustum.htm, where no detail of spadix can be found. While the TPL and GRIN recognize Xanthosoma robustum Schott as an accepted name the PIER and SMITHSONIAN, unlike TPL, think it is the accepted name of X. roseum Schott.

As per FLORA BRASILIENSIS -
  1. X. sagittifolium (L.) Schott = Caudex arborescence; foliorum petiolus usque 1m., lamina 4-5 dm longa ...... ovaria ovoidea, albida, stigmate flavo coronata......
  2. X. mafaffa Schott = Caudex abbreviatus; ....  ovaria ovoidea annulo stylino violaceo atque stigmate aureo 3-4 lobo instructa.....
  3. X. violaceum Schott = Caudex abbreviatus; .... 
  4. X. atrovirens C.Koch  et Bouché = Caudex abbreviatus; ....feminea cylindroidea quam mascula 3.5 plo breviore lutea, mascula sterili pallide rosea....
All the above are synonyms of X. sagittifolium (L.) Schott, where the ovaries can be whitish, yellowish or even golden (against green in Curtis's) and sterile stamens can be pale pink!

So, finally it is X. sagittifolium (L.) Schott unless expert(s) identify it as Xanthosoma robustum Schott

Thank you

Regards


P1110883x.jpg

surajit koley

unread,
Sep 20, 2014, 11:37:02 AM9/20/14
to J.M. Garg, efloraofindia
At least two species were reported from West Bengal as per paper found in the net - 1) X. sagittifolium (L.) Schott and 2) X. maximiliani Schott. The later has identified by " spathae tubus intus purpureo-sanguineus, lamina extus sanguinea" (vide Flora Brasiliensis).

It is to be noted that leaves of X. s. are tasty vegetable (vide Curtis's, Engler).

Thank you

Regards

Reply all
Reply to author
Forward
0 new messages