decussate


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

decussate

[′dek·ə‚sāt]
(botany)
Of the arrangement of leaves, occurring in alternating pairs at right angles.
(science and technology)
To intersect in the form of an X.
References in periodicals archive ?
thesauri has much deeper whorls, a higher spire, narrower umbilicus, irregular scale-like subsutural pliculae and lacks the finely decussate microsculpture of T.
Inflorescence 2-3 mm wide, spicate, terminal and lateral, segmented; each fertile segment composed of two 3-flowered cymes, decussate, immersed in the pair of opposite scale--like bracts, arising from the node above.
Symmetry of staminate pleiochasial arms: 0, decussate: 1, bilateral.
The leaves tend to be decussate on the lower stem (with opposite pairs, the succeeding pairs turned 180[degrees]), usually alternate near the stem apex, petiolate, palmately compound (except for small unifoliolate leaves at branch apices), with an odd number (3-13) of coarsely serrate, lanceolate leaflets.
More proximal to the cochlear nuclei, however, some ascending fibers decussate while others stay ipsilateral.
Two pairs of scutellar bristles, posterior pair not decussate. Presternum with 1 or 2 inconspicuous setulae on each half of sclerite.
Opposite decussate leaves; glauco-pruinose, specially in the adaxial face, varying in size and shape; ovate blade (or ovate-lanceolate, ovate-elliptic, ovate-oblong, ellipticoblong, (4-) 5.5-9 (-12) cm long and (2.5-) 3.5-5 (-7) cm wide, coriaceous; Acute or obtuse apex (sometimes acuminate); cordate base; margin entire, fimbriate; venation mix craspedodromous, inconspicuous at the adaxial face.
Type species: Pseudosubulina (Rectaxis) decussate Baker, 1926 (venezuela).
The presence of three decussate whorls of 2 stamens in Siparuna, each whorl with 2 opposite stamens is reported for the first time.
These tracts decussate (except for the anterior tract) in the lower medulla before entering the spinal cord.
Leaf simple opposite, decussate, cauline, exstipulate, petiole short, flattened, glabrous, pulvinous to sheathing base Flower bisexual, typically zygomorphic, complete, erect, sessile, hypogynous.