octostichous

from The Century Dictionary.

• 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.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Bot.) In eight vertical ranks, as leaves on a stem.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective botany In eight vertical ranks, as leaves on a stem.