octostichous

Century Dictionary and Cyclopedia

1. In botany, eight-ranked: a term employed in phyllotaxy to indicate those plants in which the leaves are arranged on the stem in eight vertical ranks, as in the holly and aconite, and the radical leaves of Plantago. The leaves are separated by three eighths of the circumference, the ninth leaf being over the first at the completion of the third turn of the spiral. See phyllotaxis.

Wiktionary

1. adj. botany In eight vertical ranks, as leaves on a stem.

GNU Webster's 1913

1. adj. (Bot.) In eight vertical ranks, as leaves on a stem.