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Catnip,
Nepeta cataria
Flowers in short spikes of crowded clusters terminating the branches, per Wildflowers of the Southern Mountains (Smith, 1998).
Clingman's Hedgenettle,
Stachys clingmanii
Hedgenettles are tall plants w interrupted spikes of .5" pink-purple flowers, per Wildflowers of the Southern Mountains (Smith, 1998).
Broadtooth Hedgenettle,
Stachys latidens
Hedgenettles are tall plants w interrupted spikes of .5" pink-purple flowers, per Wildflowers of the Southern Mountains (Smith, 1998).
Florida Pennyroyal,
Piloblephis rigida
Small flowers are in compact, conelike spikes at branch tips, per Everglades Wildflowers (Hammer, 2002, 2015).
Spearmint,
Mentha spicata var. spicata
Spikes more slender than Peppermint's and with a distinctive Spearmint aroma, per Wildflowers of the Southern Mountains (Smith, 1998).
Peppermint,
Mentha ×piperita var. piperita
Flowers in thick compact spikes. Lvs smooth, lanceolate, w 1/8-1/4" petioles, per Wildflowers of the Southern Mountains (Smith, 1998).
Culver's-root,
Veronicastrum virginicum
Flowers born in showy spikes, terminal or from upper leaf whorls, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
Eastern Indian Paintbrush,
Castilleja coccinea
Greenish-yellow flowers in terminal spikes subtended by red leaf-like bracts, per Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011).
Squawroot,
Conopholis americana
Small white to yellowish tubular flowers in dense terminal spikes make up half or more of the stem, per Wildflowers & Plant Communities of the Southern Appalachian Mountains and Piedmont (Spira, 2011).
Yellow Bractspike,
Yeatesia viridiflora
Flowers in conspicuously bracted spikes, per Manual of the Southeastern Flora (JK Small, 1933).
Heartleaf Plantain,
Plantago cordata
Spikes on scapes from plant base, the inflorescences often 1 meter in height, per Weakley's Flora (2022).
Black Snakeroot,
Pterocaulon pycnostachyum
Heads in oblong, terminal spikes, per Weakley's Flora (2022).