The earhead of cumbu.the pearl millett(Penninsetum typhoides.) Stapf and Hubbard)is composed of a number of fascicles seriately disposed along a central rachis.Surrounding the spikelets in each fascicle is a whorl of 30-70 (average 400free bristles.One of these bristles is thicker and longer than the rest and is called the "principal"bristle.The morphological nature of this principle bristle has been discussed elsewhere and set down as the proloongation of the fascicle axis."
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