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 > > > --
