a thin twig or thin twigs, a green twig (freshly cut) (see Molina)
Alonso de Molina:
tlacocelic. vardasca, o mimbre. s. vara verde. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 118r. col. 2. Thanks to Joe Campbell for providing the transcription.