Calina acaulis L.(Silver thistle)

9th September 2018 Categories: Radix

Carlina acaulis, the stemless carline thistle, dwarf carline thistle, or silver thistle, is a perennial dicotyledonous flowering plant in the family Asteraceae, native to alpine regions of central and southern Europe. The specific name acaulis (New Latin for “without a stem,” from Latin caulis “stem” or “stalk”) and common names are descriptive of the manner in which its flower head rests directly upon a basal leaf rosette.

The spiny, pinnatilobate leaves grow in a basal rosette approximately 20 cm in diameter. The flowers are produced in a large (up to 10 cm) flowerhead of silvery-white ray florets around a central disc. The disc florets are tubular and yellow-brown in colour. To protect the pollen, the head closes in wet weather, a phenomenon folklore holds to presage forthcoming rain. The flowering time is between August and September.

It prefers chalky soils and dry pastures in environments from valleys up to an altitude of 2,800 m.

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