Description The Common White Spider Orchid is a spider orchid from Western Australian. The flower is white with very long drooping lateral petals and sepals. The dorsal petal is more upright, and the labellum or lip has toothed edges. there are a number of subspecies with differences in flower shape and color. Most subspecies has red markings on the labellum such as red toothed margins and red warts (calli), although the Stark White Spider Orchid (Caladenia longicauda eminens) has an all white form with no red. Subspecies include Merritt's White Spider Orchid (Caladenia longicauda merrittii), Inland Spider Orchid (Caladenia longicauda rigidula), Coastal White Spider Orchid (Caladenia longicauda calcigina), Tangled White Spider Orchid (Caladenia longicauda redacta), Hills White Spider Orchid (Caladenia longicauda clivicola). The species has a single leaf that grows to about 25 cm long.
Habitat swamps, wet hollows, water margins
Distribution Caladenia longicauda is found in south west of Western Australia from around Geraldton to east of Esperance.