Dipentodon sinicus Dunn, Bull. Misc. Inform. Kew 1911: 311 1911. (syn: Dipentodon longipedicellatus C.Y.Cheng & J.S.Liu);
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Assam to China (Yunnan, SW. Guizhou, NW. Guangxi): Assam, China South-Central, China Southeast, Myanmar, Tibet as per POWO;
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/wp-content/uploads/2020/10/Shrub%20from%20Arunachal%20Pradesh.jpg/wp-content/uploads/2020/10/Shrub%20from%20Arunachal%20Pradesh%20-2-.jpg/wp-content/uploads/2020/10/Shrub%20from%20Arunachal%20Pradesh%20-1-.jpg

Shurb/Small tree from Arunachal Pradesh for ID:
Shrub, 2.5 – 3m tall. In Primary Forests. Alt. 2500m.


It at first reminded me of Alniphyllum, but the inflorescence is wrong.


First, please let me state clearly that – please do not waste much of your time trying to find a satisfying result based upon my random guess!
My guess is, it may be a Rhynchotechum species of Generiaceae family.


First, please let me state clearly that – please do not waste much of your time trying to find a satisfying result based upon my random guess!
My guess is, it may be a Rhynchotechum species of Generiaceae family.


Thanks, … I do not feel so as per Rhynchotechum


I did tell you Sir, it was my random guess, based on the inflorescence character!


It maybe a member of Ericaceae, like Diplycosia or Gaultheria.


Leaf veins does not seem fit to match any sp. as suggested. However , doubtful about Gaultheria akaensis S.Panda & Sanjappa ?? Not sure. And flowers also look different!


Agreed, Sir, no entry in the “Flora of British India”, based on my suggestion, matches with the submitted photographs.


I spent a lot of time, all in vain, didn’t even reach a remotely possible id. Even, I am not sure what I am looking at – flowers/buds or fruits?!


Finally, I think what I see in these pictures are not flowers (or buds) but early stage of samara hanging from annotinous (!!!) shoots, as can be seen in Ulmus.
But as per FBI, Ulmus have serrate to crenulate leaf margin.
For this species, please check any probability of Holoptelea integrifolia (Roxb.) Planch. I know the id would not tally with eFI uploads. I have only two things for my favour (1) KEW herbarium where leaf venation looks similar and (2) leaves coriaceous, glabrous or pubescent beneath (FBI).
If you don’t agree it’s okay with me. But I am done with it!


Thanks, …, for your efforts. I do not think so.


You are right Sir ji, but there are very few genera where perianth limbs are so many, as in Ulmus – https://www.flickr.com/photos/helicongus/7558255778


A reply from Kate Armstrong ji;
This is Dipentodon sinicus (Dipentodontaceae). See the Flora of China account here:
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200012789
It has been reported from NE India by Bhattacharyya and Johri (Fl. Pl. Taxon. & Phylogeny, 75. 1998).”


A great relief !


Thanks Sir, no wonder I failed!


You’re very welcome – I’m glad this was helpful! I misidentified one of my own collections of Perrotettia (also Dipentodontaceae) from northern Myanmar as a Gaultheria. So, when I saw these “Gaultheria”/Dipentodon photos from Arunachal Pradesh, the taxon was familiar. Dipentodontaceae is, apparently, quite rare in India. I had thought that your photo might represent a new record, but it appears as though the species had already been reported in 1998 paper Bhattacharyya & Johri. Nonetheless, it’s a very interesting find!


If you see the note in Flora of China under Dipentodon sinicus (Dipentodontaceae). Reported from NE India by Bhattacharyya and Johri (Fl. Pl. Taxon. & Phylogeny, 75. 1998 but no specimens from there have been seen by the authors. There is a need for collecting the specimens for confirming the identity by Kate Armstrong. From photographs the serrated leaf margin is not clear, floral parts and fruit would also help in confirming the identity. All photographers should provide place (including District, Taluka or subdivision Lat-Long and altitude as it is now possible on android mobile phones) and date of photography and other field information. Here altitude is given


Image downloaded from POWO


You mean to say that it is not Dipentodon sinicus ?


No, I am no very sure. If it is Dipentodonton It could be a new one?! Ask the the member who posted it provide precise locality so that I can request a BSI Scientist to collect it. The Type image is also posted in POWO


It was posted by Late …


Thanks for your message about the Dipentodon images. I am not an expert in this (monotypic) genus and have actually never collected it before. Nonetheless, the photos in the previous email do match the description and illustration of Dipentodon sinicus in the Flora of China, and I would identify it as this species. To check if it could be a new species, I agree that specimens are necessary. Bruce Bartholomew (at California Academy of Sciences) was the co-author on the FoC Dipentodontaceae treatment and could probably advise better on whether this could be a new species or not… but as you pointed out, he would likely ask to see specimens.


Thank you … for the feed back. Kate Amstrong was right it should been seen by family expert and in such cases very difficult to depend on images to confirm id.
Incidentally, Late Dr M K Pathak was my Ph D student.


 

 


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References:
POWO Catalogue of Life The Plant List Ver.1.1 WCSP IPNI GBIF (High resolution specimens) Flora of China FOC illustration India Biodiversity Portal Research Gate plantsystematics  Flickr treesandshrubsonline

Comments

  1. Sanjappa

    If you see the note in Flora of China under Dipentodon sinicus (Dipentodontaceae). Reported from NE India by Bhattacharyya and Johri (Fl. Pl. Taxon. & Phylogeny, 75. 1998 but no specimens from there have been seen by the authors. There is a need for collecting the specimens for confirming the identity by Kate Armstrong. From photographs the serrated leaf margin is not clear, floral parts and fruit would also help in confirming the identity. All photographers should provide place (including District, Taluka or subdivision Lat-Long and altitude as it is now possible on android mobile phones) and date of photography and other field information. Here altitude is given

  2. Sanjappa

    Contd…
    We do not know it could be a new species or new variation. If you compare the photographs as the group members depend on the images of flowering twigs appear apparently different in the images give above and those from China in POWO. The number flowers per umbel are many in China (I have not counted) while in Arunachal specimen are comparatively fewer. There could be many other characters if we examine actual specimens.

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