treatments/Cirsium hydrophilum var. vaseyi

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Cirsium hydrophilum   var. vaseyi Leafl. W. Bot.. 9: 11. 1959.

Mount Tamalpais or Vasey’s thistle

Heads usually 3–3.5 cm. Cypselae oblong or elliptic, 4–5 mm. 2n = 32.

Flowering spring–summer (May–Jul). spring-fed marshy meadows on serpentine parent material in areas of chaparral and mixed evergreen forest ;300–500 m;Calif.;

Variety vaseyi is endemic to the slopes of Mt. Tamalpais in the southern North Coast Range of Marin County, California.