Flora of the Southeastern United States
2022 Edition

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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 Hyptis

1 Flowers borne in irregular verticillate spikes, sessile to pedunculate on peduncles 1-2 mm long; leaves either ovate to deltate, narrowed to a broadly cuneate to truncate base and well-developed petiole (4-6 cm long on larger leaves), or lanceolate and narrowed to a cuneate, subpetiolar base.
..2 Stem scabrous on the angles; corolla blue-purple; leaves ovate to deltate, narrowed to a broadly cuneate to truncate base and well-developed petiole (4-6 cm long on larger leaves)
..2 Stem glabrous or pubescent; corolla white; leaves lanceolate, narrowed to a cuneate, subpetiolar base
1 Flowers borne in large, globose heads, 1.5-2.5 cm across, borne on peduncles 2-6 cm long; leaves lanceolate, narrowed to a narrowly cuneate, subpetiolar base.
....3 Involucral bracts < 1 mm wide; peduncles usually < 1 cm long; [alien, so far known only from FL]; [section Marrubiastrae]
....3 Involucral bracts > 1.5 mm wide; peduncles usually > 1 cm long; [native, widespread in the Coastal Plain of our area]; [section Hyptis]
......4 Stem internodes short-pubescent; leaves 3-8× as long as wide; [NC to FL to e. TX]
......4 Stem internodes glabrous or nearly so; leaves 8-20× as long as wide; [c. and s. peninsular FL]