rachilla

(redirected from rachillae)
Also found in: Dictionary, Encyclopedia.

rachilla

(rə-kĭl′ə)
n. pl. ra·chillae (-kĭl′ē)
The axis of a spikelet of a grass or sedge.
References in periodicals archive ?
The flowers are 6.81 to 11.44 mm in length and 2.41 to 5.24 mm in width, and are located in the apical rachillae of significantly shorter length (Table 2).
inajai, inflorescencis with up to 35 rachillae. In the present work, the number of rachillae varies from 18 to 36.
(2006) observed only staminate flowers in the apical rachillae of four of the seven inflorescences of Astrocaryum aculeatum studied, which is a new finding for this species.
Inflorescence erect or curved, pendulous in fruit, once branched; peduncle 80 cm long, with brownish indumentum, densely armed with black (yellowish in bud) spines to 4 cm long; peduncular bract >52 cm long, 2.4 cm wide, coriaceous, with brown indumentum, unarmed; rachis 28-38 cm long, with indumentum like that of the peduncle, with abundant short spinules up to 0.1 mm long, and scattered spines up to 1 cm, mostly near base; rachillae 54-62, densely spinulose; basal rachillae 17-20 cm long, with a basal sterile portion up to 12 mm, with triads in the basal 1/3-1/4 their length; apical rachillae ca.
erinacea Middle pinnae length 50-69 cm 14-40 cm Middle pinnae shape Narrowly Broadly cuneate cuneate to almost linear Middle pinnae 4-13 1.5-4.5 length/width ratio Number of rachillae 8-13 15-180 Insertion of rachillae Evenly spaced Widely 3-4 cm apart separated along the proximallly, rachis densely crowded distally Pollen Spiny With densely positioned, sparsely fusing supratectal clavae Table 2.
Epicarp covered in indument, setose or spiny; pistillate flower usually one per rachilla (some rachillae, usually those located at the base of the rachis, are sometimes found with 2-3 flowers in the most vigorous plants)--21
Acaulescent or subacaulescent (to short-stemmed) palms; petiole rusty-red tomentose; rachis up to 30 cm long, bearing up to 70 rachillae up to 20 cm long--14
Palms with large stems; petiole not rusty-red tomentose; rachis usually longer than 40 cm, bearing more than 90 rachillae usually longer than 25 cm--15
This group is defined by the unilateral staminate flowers on staminate rachillae and conspicuous fiber clusters organized in one circle in the thick endocarp (Fig.
4), peduncular bract thin, staminate flowers spirally arranged on staminate rachillae and dispersed fibers within a thin endocarp (Fig.
phalerata complex but have spirally arranged staminate flowers on staminate rachillae similar to those of the A.