Cirsium hydrophilum var. vaseyi
Leafl. W. Bot. 9: 11. 1959.
Heads usually 3–3.5 cm. Cypselae oblong or elliptic, 4–5 mm. 2n = 32.
Phenology: Flowering spring–summer (May–Jul).
Habitat: Spring-fed marshy meadows on serpentine parent material in areas of chaparral and mixed evergreen forest
Elevation: 300–500 m
Of conservation concern.
Variety vaseyi is endemic to the slopes of Mt. Tamalpais in the southern North Coast Range of Marin County, California.
"fine" is not a number."broad" is not a number.