from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Arranged in exactly vertical ranks, as leaves on stems.
from the GNU version of the Collaborative International Dictionary of English
- adj. Arranged in exactly vertical ranks, as the leaves on stems of many kinds; -- opposed to curviserial.
from The Century Dictionary and Cyclopedia
- Disposed in a right line; rectilinear or straight, as a row or series of parts.
- In botany, disposed in one or more straight ranks: specifically used by Bravais, in contrast with curviserial (which see), to describe those forms of phyllotaxy in which a second leaf soon stands exactly over any given leaf, and thus all fall into right lines.
recti- + serial (Wiktionary)
The leaves of this plant are naturally rectiserial and decussate, but, in the twisted stem the leaves were curviserial, and arranged according to the 5/13 plan.