Fls sessile in compact globose heads, all or mostly 5-merous; cal- lobes very broadly ovate, acute, about equaling the urceolate cor; stigma slender, appearing as a continuation of its style, the two together to about as long as the ovary, included in the eventually calyptrate cor; fr depressed-globose, 2-2.5 mm high and 2.5-3 mm thick, circumscissile near the base; seeds 4, ca 1.2 mm; 2n=42. Native of Europe, parasitic on flax and to be expected in this country wherever flax is grown.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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