parastichy

parastichy

[pi-ras-ti-kee]
noun, plural parastichies. Botany.
one of a number of seemingly secondary spirals or oblique ranks winding around the stem or axis to the right and left in a spiral arrangement of leaves, scales, etc., where the internodes are short and the members closely crowded, as in the houseleek and the pine cone.

Origin:
1870–75; para-1 + stich1 + -y3

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World English Dictionary
parastichy (pəˈræstɪkɪ)
 
n , pl -chies
1.  a hypothetical spiral line connecting the bases of a series of leaves on a stem
2.  an arrangement of leaves so connected
 
[C19: from para-1 + Greek stikhia, from stikhos row, rank]
 
pa'rastichous
 
adj

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