Nathaniel Whitmore
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Mentha

6/24/2015

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some study notes for Mentha
in consideration of a patch of Mint growing in a field
key culled from Plants of Pennsylvania by Rhoads & Block



LAMIACEAE

1. corola regular or nearly so
     2. inflorescences dense, head-like terminal clusters  -  Pycnanthemum  Mountain Mints
     2. inflorescences of many-flowered terminal or axillary clusters  -  Mentha 
1. corola conspicuously liped
     3. calyx regular or nearly so
          4. upper lip of corola hooded
               5. calyx lobes prolonged into short, stiff spines  -  Galeopsis bifida  Hemp Nettle
               5. calyx lobes not prolonged into spines  -  Stachys  Hedge Nettles
          4. upper lip of corola more-or-less flattened  -  Pycnanthemum
     3. calyx distincly 2-lipped; upper calyx lip 3-lobed, lower lip 2-lobed  -  Clinopodium vulgare  Wild Basil 


Mentha

1. infloresnences essentailly terminal, whorls of flowers subtended by bracts or greatly reduced leaves
  2, M. aquatica  Water Mint  (very rare in streambanks SE & SW)
  2. inflorescence spike-like, consisting of 3 or more whorls extending down the stem
    3. leaves densely pubescent beneath  ...M. longifolia (Horse Mint)...M. x rotundifolia (Apple Mint)...M. x villosa (Wooly Mint)
    3. leaves glabrous    ...M. spicata...  ...M. x piperata
2. inflorescences essentially axillary, whorls of flowers subtended by normal or somewhat reduced leaves
  4. M. pulegium  Pennyroyal
  4. leaves with 4 or more lateral veins on each side of the midvein
    5. plants generally pubescent
      6. calyx 1.5 - 2.5 mm long  -  M. arvensis  Field Mint     (Used in Chinese herbal medicine.)
      6. calyx 2.5 - 4 mm long  -  M. x verticillata  Mint
    5. plants essentially glabrous or with sparse pubescence  -  M. x gentilis  Red Mint


Notes on some eliminations (35 general in original key):
Hedeoma (Mock and American Pennyroyal) sp. are annual.
Blephilia (Wood Mints) mostly West.
Salvia sp. mostly South and with showy flowers.
Cunila origanoides (Common Dittany or Stone Mint) is glabrous and mostly South.
Trichostema dichotomum (Blue Curls) is annual and has showy "blue-curls".
Teucrium canadense (Wild Germander or Wood Sage) has leaves 5-10 cm.
Agastache (Giant Hyssops) sp. are 1 to 1 1/2 meters tall.
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