rachilla


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rachilla

[rə′kil·ə]
(botany)
The axis of a grass spikelet.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The fruit was attached to the rachilla between the intermediate portion and the end opposite to the support.
The axis of spikelet (rachilla) is a sinuous, notched structure and is composed of a number of short segments.
Male inflorescence much smaller, 12-25 cm long, sometimes larger, main stalk 60-90 cm long, flat, glabrous, rachilla arises from and near the apex of the main stalk.
In addition, the rachilla that joins the fertile lemmas with the sterile lemmas was clearly observed (Fig.
At the larger end of the seed and in the furrow there is a club-shaped appendage (rachilla) about one-sixteenth of an inch long.
It is a mid-season, white pearl, six-rowed spring barley with smooth awns, short rachilla hairs and more lateral vein barbs than Morex.
Each lateral spikelet emerges from the axillary bud of a bract, bearing a prophyll and a varying number of glumes arranged on an open axis (rachilla); some or all of these glumes develop an axillary flower, so some taxa have empty glumes, while in other taxa each glume carries a flower.
The flowers were measured (length and width) and quantified, estimating the average number per inflorescence and per rachilla and their positions on the rachis.
The results imply that, grains along the rachis were less affected in their nutrient concentrations than those along the rachilla. Similar results have been found for grain N concentration between wheat spikelets [8, 9].
They differ from all the other species of Astrocaryum in having (i) multifold lateral segments in adult palms, (ii) staminate flowers covering the whole rachilla, without a sterile part, (iii) rachilla woolly-white between the flowers, (iv) stigmas much shorter than ovary, and (v) perivascular sclerified sheath continuous (discontinuous in Astrocaryum).
Perigynia lacking a rachilla or, if present, vestigial and not tipped with a hooked inrolled scale I.
Three types of spike disarticulation are observed within the Aegilops and wild Triticum species present in Europe, that is, at the base of the rachilla (wedge-type), at the top of the rachilla (barrel-type), and at the base of the lowest fertile spikelet (whole-spike type).