KEY TO THE SPECIES

1Verticillasters consisting of 2-12 flowers, apart, secund, forming a spike-like inflorescence. Calyx 2 mm (in fruit 2-5-3 mm) long, tube gibbous, sparsely short-haired
1'Verticillasters consisting of many (usually over 15) flowers, closely approximate, terete, in dense spike-like or paniculate inflorescences. Calyx tubular, not gibbous, 2-4.5 mm long, in fruit 3-6.5 mm, sparsely or densely covered with whitish hairs