Sir, I can only say that i am earnestly grateful to you for your guidance and support.
With regards, surajit On Sat, Aug 4, 2012 at 9:55 AM, manoj chandran <[email protected]> wrote: > Hai ! > The photo you send reveals several features. Most of the spikelets in the > photograph show the lower lemma, which you can see is having distinguishing > nervation. The lower glume is absent and that it why you see only the lower > lemma. On the bottom right corner, you can see a spikelet that is looking > almost naked. This is the other side of the spikelet showing the upper > lemma. You can see a small triangular scale like upper glume in this > spikelet, which distinguishes it from D.sanguinalis, in which case, this > upper glume would be covering the upper lemma to a great extent and not > leave it naked like this one. You can try turning around the other > spikelets too to see this character. > Regards... > Manoj Chandran. > > On Friday, August 3, 2012 10:35:53 PM UTC+5:30, surajit koley wrote: >> >> Sir, >> >> I was trying to understand the visual differences between *Digitaria >> setigera* and *D. sanguinalis*. But, i confess that the ID keys are >> beyond my capacity. The only key i could understand is the stiffer and less >> racemes, on *D. sanguinalis*, with larger spikelets. Unless i find both >> the species side by side and examine them with the help of a very good >> magnifying glass, i think, i won't be able to identify these *Digitaria* >> grasses. >> However, i am attaching another image of this grass showing a closer view >> of the inflorescence. >> >> Thank you for the correct ID of this grass. >> >> Regards, >> >> surajit >> >> >> >> >> On Fri, Aug 3, 2012 at 8:39 PM, manoj chandran <[email protected]>wrote: >> >>> This is Digitaria setigera. The racemes are numerous and flexuous. Also >>> try to see whether there are isolated setae (small single hair) on the >>> racemes or rachis. The same grass can also be seen with shorter racemes in >>> low nutrition habitat and then they will not be flexuous. D.sanguinalis >>> usually has stiffer racemes and not so many racemes. The spikelets are much >>> larger in D.sanguinalis and the zig zag rachis is more winged and serrate. >>> The upper glume would be large in case of D.sanguinalis (but this character >>> is not visible in the photo). In case of D.setigera, the upper glume is >>> reduced to a small triangular scale. Also, on maturity, you can see the >>> ciliate hairs protruding out of the spikelet in case of D.sanguinalis. >>> Some authors do not consider D.sanguinalis as a separate species, but >>> consider it as a variety of D.ciliaris. >>> Regards... >>> Manoj Chandran. >>> >>> On Thursday, August 2, 2012 11:33:01 PM UTC+5:30, surajit koley wrote: >>>> >>>> Sir / Madam, >>>> >>>> I attach two sets of photographs, recorded at different places and on >>>> different dates. I am not sure if the two sets are of same species. >>>> >>>> Species : *Digitaria sanguinalis* (L.) Scop. ? >>>> Habit & Habitat : set1 & set2 : about 2.5 feet, beside railway track, >>>> (set2 : leaves 20 cm x 1.5 cm) >>>> Date : set1 - 19/7/12 & set2 - 1/8/12 >>>> Place : Hooghly >>>> >>>> Thank you & Regards, >>>> >>>> Surajit Koley >>>> >>>> >>>> -- >>> >>> >>> >>> >> >> -- > > > > --
