Data mode


Sign up

Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Lycopus

Copy permalink to share

1 Calyx lobes acute at the apex, shorter than or equaling the nutlets.
..2 Plant without tubers; leaf base tapered to a long, winged petiole; corolla lobes 4, erect; leaf teeth (6-) avg. 8.6 (-11) per side
..2 Plant usually with tubers; leaf base subsessile or tapered to a short, winged petiole; corolla lobes 4 or 5, all or some spreading; leaf teeth (2-) avg. 5.0 (-7) per side.
....3 Corolla lobes 4, one erect and three spreading; nutlet tubercles well-developed, deeply toothed; leaf teeth (2-) avg. 4.5 (-6) per side; [Fall-line Sandhills of NC and SC]
....3 Corolla lobes 5, spreading; nutlet tubercles weakly developed, undulate; leaf teeth (4-) avg. 5.4 (-7) per side; [Mountains, upper Piedmont, and VA Coastal Plain]
1 Calyx lobes acuminate to subulate-tipped, much exceeding the nutlets.
......4 Nutlet tubercles not developed or only weakly so.
........5 Calyx 2.0-3.3 mm long; stems and branches glabrous to sparsely pubescent with hairs < 0.5 mm long; leaf teeth sharply acute to short-acuminate
........5 Calyx 3.0-4.5 mm long; stems and branches densely to sparsely pubescent with hairs 0.5-1.6 mm long; leaf teeth blunt to acute
......4 Nutlet tubercles well developed (appearing as 4-5 knuckle-like knobs.
..........6 Leaves evidently petiolate, the petioles narrowly winged; collectively widespread in our region].
............ 7 Calyx lobes subulate, apex acute; leaves pubescent with short eglandular, and also densely distributed short stipitate-glandular trichomes, especially distal vegetative parts; [West Gulf Coastal Plain]
............ 7 Calyx lobes triangular, attenuate to acute apex; leaves glabrous, glabrate, canescent or pubescent, sometimes densely so throughout; [widespread in our region]
..........6 Leaves sessile or subsessile; [mainly Coastal Plain, scattered and disjunct inland].
............ ..8 Leaves ovate to lanceolate, usually rounded at the base, scarcely reduced upward on the stem, occasionally glandular pubescent
............ ..8 Leaves lanceolate to linear, cuneate at the base, upper leaves conspicuously narrower (and often also shorter) than the lower leaves, typically glandular pubescent
Cite as...