What is "dutchman's pipe"

Dutchman \Dutch"man\, n.; pl. Dutchmen. A native, or one of the people, of Holland.

Dutchman's laudanum (Bot.), a West Indian passion flower ( Passiflora Murucuja); also, its fruit.

Dutchman's pipe (Bot.), .

Dutchman's pipe is a common name for some unrelated flowering plants, which have flowers, inflorescences or stems resembling a pipe:

• Aristolochia species (birthworts or pipevines) from the Aristolochiaceae, particularly Aristolochia macrophylla
• Epiphyllum oxypetalum (" night-blooming cereus") from the Cactaceae
• Monotropa hypopitys (also known as yellow bird's-nest or pinesap) from the Ericaceae