grass Chionachne? from Hooghly 8/10/12 sk2

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surajit koley

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Oct 8, 2012, 2:15:30 PM10/8/12
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Sir,

Found this grass in a roadside waste place. Is this the same Chionachne koenigii (Spreng.) as in my earlier post at - https://groups.google.com/d/topic/indiantreepix/FW5XrKtEnho/discussion?

Species : Chionachne koenigii (Spreng.)
Habit & Habitat : about 5.5. feet high, some even 7 feet or more; leaf avg. 45 cm x 5 cm
Date : 8/10/12, 10.11 a.m.
Place : Hooghly

Thank you & Regards,

surajit
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Rohit Patel

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Oct 9, 2012, 3:03:56 AM10/9/12
to surajit koley, efloraofindia
Can u try with Coix ??????

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surajit koley

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Oct 9, 2012, 12:24:11 PM10/9/12
to Rohit Patel, efloraofindia
Sir,

It looks like Coix lacryma-jobi. Moreover, as per Flora of Pakistan  the leaves of Chionachne koenigii are narrower than what can be seen in my post. But i am not sure.

Regards,

surajit

manoj chandran

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Oct 9, 2012, 1:18:33 PM10/9/12
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This is Coix gigantea. You can see the large wings on the glumes of the male spikelets. The earlier post was not showing the spikelets very clear. It could also be  Coix gigantea. You can see if the plant in the earlier post had winged glumes and whether the stems/leaf sheaths were having stinging hairs, if so it is Chionachne. The female spikelet of Chionachne koenigii is flatter than Coix. Both are tall and the habit and habitat are also similar in both genera. 

surajit koley

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Oct 9, 2012, 1:34:14 PM10/9/12
to manoj chandran, indian...@googlegroups.com
Sir,

Thank you very much for all details on Coix and Chionachne. This grass is from another place and i could not get closer to the species of the earlier post. I think i will be able to identify the three species in future, based upon the keys you have given here. Descriptions available in Flora of China and Flora of Pakistan are often confusing. specially regarding the leaves sizes.

Regards,

surajit


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jmgarg1

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Oct 20, 2012, 9:32:41 AM10/20/12
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Thanks, Manoj ji, for the Id.
Both GRIN as well as The Plant List treat Coix gigantea J.Koenig & Chionachne koenigii (Spreng.) Thwaites as the syn. of Chionachne gigantea (J.Koenig) Veldkamp as per links:
 
Do you think that they are different ?

 
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manoj chandran

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Oct 22, 2012, 1:32:19 AM10/22/12
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Dear Sir,
Thank you for the links. I think they have made a grave mistake. It is ok whatever genus name they want to put, Coix and Chionachne may be treated under the same genus, though there are characters sufficient enough to treat them differently. However, both koenigii and gigantea are entirely different species. 
The main difference between the two genera are the shape and position of the 'bead', i.e, the female spikelet. In Coix, it is enclosed by the leaf sheath modified involucre to look like a spherical ovate to orbicular bead and completely exserted, whereas in Chionachne, the female spikelet is a compressed, oblong bead and not exserted completely and the leaf sheath is not modified into an involucre . Another major difference is the presence of stinging hairs in Chionachne, whereas Coix does not have such hairs. Hence Coix is more palatable and a good fodder, whereas Chionachne is not. Coix is more common in moist and waterlogged and abandoned agriculture fields, canal banks, etc., wheras Chionachne is a species found in similar habitat in forest areas. 
Regards...
Manoj Chandran

On Monday, October 8, 2012 11:45:36 PM UTC+5:30, surajitkoley wrote:

J.M. Garg

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Dec 2, 2019, 12:01:43 AM12/2/19
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Relevant feedback from another thread:
.............. Coix gigantea (both Hoogly photos) .....
It is clear that Chionachne koenigii is definitely different from Coix gigantea even when treated as Chionachne gigantea. As per priority rule, the genus Coix will prevail over Chionachne, even if someone wants to consider both under the same genus. But there are very distinct differences between the two genera. The new combination of Chionachne gigantea with all the others being treated as synonyms is published in the revision of Chionachne in Blumea. But definitely there is some mistake. I have not yet gone through the full paper of revision of Chionachne published in Blumea. Once I get a copy of this and go through, I will respond further.

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dr.rakesh Singh

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Dec 2, 2019, 9:02:22 AM12/2/19
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This is very similar to my recordings from Siwan , Bihar , though my photos are not that good . 

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J.M. Garg

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Dec 2, 2019, 11:32:34 AM12/2/19
to efloraofindia, dr.rakesh Singh
Thanks a lot, Manoj ji.

---------- Forwarded message ---------
From: Manoj Chandran
Date: Mon, 2 Dec 2019 at 21:38
Subject: Re: [efloraofindia:134316] grass Chionachne? from Hooghly 8/10/12 sk2
To: J.M. Garg <jmg...@gmail.com>


Coix gigantea

On Mon, Dec 2, 2019 at 10:31 AM J.M. Garg <jmg...@gmail.com> wrote:
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