The Collaborative International Dictionary
Rectiserial
Rectiserial \Rec`ti*se"ri*al\ (-s?"r?*al), a. [Recti- + serial.] (Bot.) Arranged in exactly vertical ranks, as the leaves on stems of many kinds; -- opposed to curviserial.
Wiktionary
rectiserial
a. (context botany English) Arranged in exactly vertical ranks, as leaf on stems.