Sheviak, C., Catling, P., 2002. Pogonia, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., 2002. Pseudorchis, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Brown, P., 2002. Spiranthes, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Catling, P., Sheviak, C., 2002. Tipularia, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Catling, P., 2002. Amerorchis, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Catling, P., 2002. Aplectrum, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Catling, P., 2002. Arethusa, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Catling, P., 2002. Calypso, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Catling, P., 2002. Cephalanthera, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.

Sheviak, C., Catling, P., 2002. Coeloglossum, in: Committee, Flora (Ed.), Magnoliophyta: Liliidae: Liliales and OrchidalesOxford University Press, New York, New York.