A Grammatical Dictionary of Botanical Latin

Verticil, whorl, the 'whorl of a spindle;’ “a whorl [q.v.]; a ring of organs on the same plane” (Lindley); a whorl or circular arrangement of similar parts around an axis; three or more leaves or flowers at one node, in a circle; the 'cycle', q.v.; (fungi) “a whorl of spores, etc.” (S&D): verticillus,-i (s.m.II), abl. sg. verticillo, nom. pl. verticilli, acc. pl. verticillos, dat. & abl. pl. verticillis [> dim. of L. vertex,-icis (s.m.III), a whirl, that which turns; the whirl [sic] of a spindle (Lewis & Short)]; a 'cycle', q.v.; see whorl; cf. candelabriformis,-e (adj.B);

- folia quaterna, in quoque verticillo duo longiora, duo breviora, leaves four together, in each whorl two longer, two shorter (Stearn).

- foliis oppositis verticillatisve parvis indivisis stipulatis (B&H), with opposite leaves or small undivided stipulate verticils.

Verticillus,-i (s.m.II) spurius (adj.A), abl. sg. verticillo spurio: the same as verticillaster, q.v.