orthostichy

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orthostichy

(ɔːˈθɒstɪkɪ)
n, pl -chies
1. (Botany) an imaginary vertical line that connects a row of leaves on a stem
2. (Botany) an arrangement of leaves so connected
[C19: from ortho- + Greek stikhos line]
orˈthostichous adj
References in periodicals archive ?
4 cm, yellow-beige tomentose with green undertones; microsporophylls arranged in 14-16 orthostichies of 16-25 fertile sporophylls each, obtrullate, 10-11 x 89 mm at pollen shedding, bullae encompassing 1/4 to 1/3 of total length of sporophyll, beige-yellow tomentose, face hexagonal, 5-5.
In the inflorescence of some species of Cyperus (Guarise & Vegetti, 2007), the formation of more than three orthostichies can be observed.
These 20 species include Attalea maripa, which has leaves arranged in five vertical ranks or orthostichies, corresponding to a 2/5 phyllotactic fraction, while most other species of Attalea sensu lato and Cocoseae in general have a 3/8 fraction.