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Aquatic and Wetland Vascular Plants of the Northern Great Plains

Lamiaceae - The Mint Family

Perennial herbs, some aromatic, with square stems and simple, opposite, serrate or incised-toothed leaves. Flowers axillary or in terminal heads or spikes, often appearing verticillate, perfect, nearly regular to irregular; calyx 5-toothed or sometimes bilabiate, the lobes equal to unequal; corolla white, pink, blue or purple, sometimes spotted, often bilabiate, 5-lobed or 4-lobed by fusion, the lobes very unequal to subequal; stamens 4 or 2, epipetalous; pistil 2-carpellary, style slender, gynobasic, 2-cleft at the tip, ovary superior, 4-celled and 4-lobed, splitting into 4, 1-seeded nutlets at maturity.

Lead Characteristic Go To
1 Corolla regular or nearly so, the lobes subequal. Lead 2
1 Corolla distinctly irregular, the lobes unequal. Lead 3
2 Stamens 2; plants not strongly aromatic. Genus Lycopus
2 Stamens 4; plants strongly mint-scented. Genus Mentha
3 Upper lip of the corolla lacking, the lower lip prominent, the other 4 corolla lobes positioned on its lateral margins. Genus Teucrium
3 Both upper and lower lips of the corolla well-developed. Lead 4
4 Calyx with a rounded protuberance on the upper side, 2-lipped, not toothed. Genus Scutellaria
4 Calyx without a dorsal protuberance, toothed, 2-lipped or not. Lead 5
5 Flowers short-pedicelled, borne singly in the axils of short bracts, the inflorescence comprised of 1-several, terminal and lateral racemes. Genus Physostegia
5 Flowers sessile and whorled, in a continuous or interrupted terminal spike. Lead 6
6 Calyx strongly 2-lipped, unequally 5-toothed; spike dense, continous. Genus Prunella
6 Calyx not strongly 2-lipped, with 5 equal or subequal teeth; spike interrupted. Genus Stachys

41. Lamiaceae, the Mint Family
1. Lycopus L. -- Bugleweed
1. Lycopus americanus Muhl. ex Bart. -- American bugleweed
2. Lycopus asper Greene -- Rough bugleweed
3. Lycopus uniflorus Michx.
2. Mentha L. -- Mint
1. Mentha arvensis L. -- Common mint
3. Physostegia Benth. -- Obedient plant
1. Physostegia ledinghammii (Boivin) Cantino
2. Physostegia parviflora Nutt. ex A. Gray
3. Physostegia virginiana (L.) Benth.
4. Prunella L. -- Selfheal
1. Prunella vulgaris L.
5. Scutellaria L. -- Skullcap
1. Scutellaria galericulata L. -- Marsh skullcap
2. Scutellaria lateriflora L. -- Blue skullcap
6. Stachys L. -- Hedge-nettle
1. Stachys palustris L.
2. Stachys tenuifolia Willd.
7. Teucrium L. -- Germander
1. Teucrium canadense L. -- American germander

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