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Key to Chelone
Plantaginaceae
Chelone
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40421
1 Leaves sessile or nearly so, the petioles 0-3 mm long; flowers distinctly 4-ranked; staminodes with purple tips; corolla purple
1 Leaves petiolate, the petioles 2-40 mm long; flowers less distinctly 4-ranked; staminodes with white, green, or pinkish tips; corolla purple or white.
2 Petioles (2-) 10-40 mm long; leaf blade rounded or truncate at the base; leaf blades averaging ca. 2× as long as wide, 4-8 cm wide; staminodes with white to light pink tips; corolla purple; inflorescence bracts 2-7 mm long
2 Petioles 0-15 mm long; leaf blade cuneate at the base; staminodium white or green; leaf blades averaging 3× (or more) as long as wide, 1-6 cm wide; corolla purple or white; inflorescence bracts 4-23 mm long.
3 Corolla white (or tinged with purple, pink, or green near the mouth); staminodes with green tips; palate white-bearded (rarely greenish-yellow-bearded)
3 Corolla pink or purple throughout; staminodes with white tips (rarely with green or purple tips); palate yellow-bearded (rarely white-bearded).
4 Calyx lobes glabrous or sparsely ciliate; petioles 0.3-1.0 cm long; [more widespread in our area].
5 Midcauline leaves 10.2-17.2 cm long; leaves 1.8-5.6 cm wide; [tetraploids]; [Southern Appalachians, at elevations over 400 m]
5 Midcauline leaves 5.3-10.0 (-12.5) cm long; leaves 0.8-3.8 cm wide; [hexaploids] [mainly Coastal Plain, at elevations below 200 m]