Flora of the Southeastern United States
2022 Edition

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Key to Calopogon

Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

1 Petals wider toward the tip than toward the base; lip usually as wide as or wider than long; flowers strongly fragrant
1 Petals equal or narrower toward the tip than toward the base; lip usually narrower than long; flowers scentless or mildly fragrant.
..2 Leaf appressed to the inflorescence during flowering; flowers < 1 cm apart; flowers not fragrant; flowers on same plant opening simultaneously
..2 Leaf not appressed to the inflorescence during flowering; flowers > 1 cm apart; flowers faintly to distinctly fragrant; flowers on same plant opening nearly simultaneously to sequentially.
....3 Lateral sepals 10-15 mm long, falcate, widely spreading
....3 Lateral sepals 15-28 mm long, weakly falcate to straight.
......4 Flowers of each plant opening nearly simultaneously; dilated distal portion of middle lip lobe usually much narrower than long, triangular to broadly rounded; stigma typically flat against column surface; corms elongate, forked
......4 Flowers of each plant opening sequentially; dilated distal portion of middle lip lobe usually much wider than long, typically anvil-shaped; stigma at angle to column surface; corms globose to elongate, not forked.
........5 Leaf blade strongly inrolled, almost tubular, appearing about 2-3 mm wide when not flattened; dilated distal portion of middle lip lobe whitened; [wet, alkaline sites in s. FL]
........5 Leaf blade slightly curled transversely but not inrolled, appearing about 1 cm wide; dilated distal portion of middle lip lobe pink, not whitened (except of course in all-white flowers); [acidic wetlands, widespread in our region]