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n. pl. ra·chil·lae (-kĭl′ē)
The axis of a spikelet of a grass or sedge.

[New Latin, diminutive of rachis.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(rəˈkɪlə) or


(Botany) (in grasses) the short stem of a spikelet that bears the florets
[C19: from New Latin, diminutive of rachis]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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In fact, Schoenus paludosus also differs morphologically from the other Schoenus species in having a lower male flower and an upper bisexual flower at each spikelet, next to a nonzigzag rachilla (as opposed to the usual states for the genus of bisexual flowers and upper internodes of the rachilla elongated and prominently zigzag) (Wilson 1993).
Among the mechanical properties relevant to the study of the dynamic behavior of the macaw palm fruit-rachilla system, the modulus of elasticity of the rachilla is of utmost importance, as a material, which undergoes elastic deformation when subjected to tension.
This node is referred to as the corn ear rachilla, which connects the grain to the cob structure.
The inflorescences showed development and anthesis progressing from the extremity to the centre of the rachilla. The male flowers occur at the apex and open first, while the female flowers are located at the base of the rachilla and expose their stigmas after senescence of the male flowers.
The principal mode of fungal spread in wheat from floret to floret inside a spikelet and from spikelet to spikelet is through the vascular bundles in the rachis and rachilla (Ribichich et al.
Induction and growth of callus derived from rachilla explants of young inflorescences of coconut palm.
The objectives of this present study were to establish the characteristics of the vascular system in the different parts of rachilla through which food was supplied to individual differentially growing grains of spikelet and correlate the same with their innate natures.
Female inflorescence 90-120 cm long, main stalk flat, 45-75 cm long, glabrous rachilla 30 cm or so long, spikelets numerous.
Fruit subglobose, obovoid to turbinate, laterally flattened, 2,5-3,5 cm x 1,7-2,6 cm wide, 3,1-6,2 cm long including a 2-4 mm long beak, with a pedicel (base of the rachilla) to 3 cm long; exocarp yellow to brown, covered with black bristles 1-3 mm long; mesocarp yellow, fleshy, fibrous, 2-5 mm thick; endocarp 2,1-4 cm long, asymmetrical, ovoid to turbinate and acute basally.
Spikelets 2-2.5(-2.9) mm long, 1.4-2.2 mm wide, ovoid to subflabelloid, acute to subtruncate, 2-9flowered; rachilla greenish.
Bill Rachilla is the business solutions manager for CSC's self-insured market solutions.
Spikelet morphology is characteristic of the Poaceae family, but the sterile lemmas were nearly as long as the fertile lemmas, and they have an unique crown-like structure of lignified spines between the rachilla and the fertile lemmas.