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- n. Plural form of verticillaster.
Sorry, no etymologies found.
In _Lamium album_ I have seen one of the verticillasters on one side of the stem completely wanting, the adjacent leaf being, however, as fully formed as usual.
A singular instance of prolification in the central flower of one of the verticillasters of _Phlomis fruticosa_ fell under my own notice; it was
Inflorescences generally compound, sometimes flowers solitary and axillary; verticillasters 2 - to many flowered, subtended by leaves or bracts.
a terminal spike, at the summit of along naked stalk, the spike being composed of six to ten verticillasters, more widely separated toward the base of the spike; in young plants two or four sub-spikes will branch alternately in pairs from the main stalk; this indicates great vigor in the plant, and occurs rarely after the second year of the plant's growth.