rachilla


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rachilla

[rə′kil·ə]
(botany)
The axis of a grass spikelet.
References in periodicals archive ?
The average diameter of the rachillas were obtained from the average of three diameters measured along the rachilla, one in the intermediate portion and the other two at the extremities.
Among the spikelets with a single glume, a rachilla remnant may or may not be recognized.
At each node, the rachilla bore a lemma in whose axil a floret axis ascended.
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.
The variety is a six-rowed, roughawned, long rachilla hair, white pearl spring barley.
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.
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).