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Key to MenthaView taxon page for Mentha
(For a list of species in Mentha, use the above link.) Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots. 1. Calyx interior with ring of hairs; vegetative stems decumbent lying mostly flat on the ground but with tips curving up. , flowering stems upright ..... M. pulegium 1' Calyx interior glabrous or hairs few, scattered; both vegetative and flowering stems upright 2. Inflorescence generally axillary Pertaining to or within an axil, especially a leaf axil. 3. All leaves ± equal in size, blade Expanded portion of a leaf, petal, or other structure, generally flat but sometimes rolled, cylindric, wavy, or cupped. generally ovate Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf. , generally spicy-scented ..... M. arvensis 3' Leaves reduced in size distally, blade generally linear Elongate, with nearly parallel sides; narrower than elliptic or oblong. to lanceolate Narrowly elongate, widest in the basal half, often tapered to an acute tip. , generally pennyroyal- or spearmint-scented 4' Leaves greatly reduced distally on stem, generally spearmint-scented (fruit-scented) 5. Calyx 1.5–3 mm, lobes 1. A major expansion or bulge, such as on the margin of a leaf, sepal, or petal, or on the surface of an ovary. 2. The free tips of otherwise fused structures, such as sepals or petals; larger than teeth. triangular ..... M. ×gracilis 2' Inflorescence terminal 6. Inflorescence generally head-like, clustered at distal 3–5 nodes Position on a stem from which one or more structures (especially leaves, buds, branches, or flowers) arise. 7' Blade ovate to lanceolate, generally peppermint- or spearmint-scented (lavender and citrus) ..... M. ×piperita 6' Inflorescence spike-like 9. Blade lance-oblong, glabrous (branched-hairy abaxially), spearmint-scented ..... M. spicata (2) 8' Leaves not wrinkled, occasionally deeply veined 10. Blade lanceolate to lance-oblong 11. Blade widest near middle, hairs unbranched; fertile anthers ± 0.3–0.4 mm; generally musty-scented ..... M. longifolia 11' Blade widest near base, occasionally branched-hairy abaxially; fertile anthers ± 0.4–0.5 mm; generally spearmint-scented ..... M. spicata (2) 10' Blade oblong Longer than wide, with nearly parallel sides; wider than linear. to ovate 12. Calyx ciliate Having generally straight, conspicuous hairs along margins or edges. ; fertile anthers 4; leaf Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets). blade base tapered Gradually (not abruptly) narrower or smaller at base or tip. to ± lobed; corolla 2.5–3.5 mm; GV, CCo, TR ..... M. ×rotundifolia 12' Calyx generally canescent; fertile anthers generally 0; leaf blade base tapered; corolla 3–4 mm; TR ..... M. ×villosa
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Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, https://ucjeps.berkeley.edu/eflora/ [accessed on ]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .
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