grass Chionachne? from Hooghly 8/10/12 sk2

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grass Chionachne? from Hooghly 8/10/12 sk2 surajit koley 10/8/12 11:15 AM

Found this grass in a roadside waste place. Is this the same Chionachne koenigii (Spreng.) as in my earlier post at -

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,

Re: [efloraofindia:134316] grass Chionachne? from Hooghly 8/10/12 sk2 Rohitkumar 10/9/12 12:03 AM
Can u try with Coix ??????


MO.NO.:- 09724337687

Re: [efloraofindia:134316] grass Chionachne? from Hooghly 8/10/12 sk2 surajit koley 10/9/12 9:24 AM

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.


Re: grass Chionachne? from Hooghly 8/10/12 sk2 manoj chandran 10/9/12 10:18 AM
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. 
Re: [efloraofindia:134976] Re: grass Chionachne? from Hooghly 8/10/12 sk2 surajit koley 10/9/12 10:34 AM

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.




Re: [efloraofindia:134511] Re: grass Chionachne? from Hooghly 8/10/12 sk2 JM Garg 10/20/12 6:32 AM
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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Re: grass Chionachne? from Hooghly 8/10/12 sk2 manoj chandran 10/21/12 10:32 PM
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. 
Manoj Chandran

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