Carthusian Pink

Dianthus carthusianorum is an extremely variable species; at least 12 subspecies and 35 varieties have been described. A comprehensive study is warranted to determine how many of those taxa should be recognized or whether, as proposed by T. G. Tutin and S. M. Walters (1993), the variation in many of these characters is indeed continuous.

The New Hampshire collections of Dianthus carthusianorum were made between 1914 and 1926 in Coos County (R. K. Rabeler and R. E. Gereau 1984); all other observations and collections are post-1975. Dianthus carthusianorum is sometimes cultivated and may escape.

Plants cespitose, not matted. Stems erect, simple or branched proximally, 25-65 cm, glabrous. Leaves: sheath (5-)8-18(-25) mm, 3-8 times as long as stem diam.; blade linear to spatulate, 3-7(-13) cm, green, margins glabrous. Inflorescences dense, 4-15(-20+)-flowered heads; bracts lanceolate, equaling or longer than calyx, herbaceous to scarious, apex aristate; bracteoles 4 or 6, brown, oblong-obovate to oblanceolate, 2/ 3/ 4 times as long as calyx, scarious, apex aristate in distal 1/ 1/ 5. Pedicels 0.1-2 mm. Flowers subsessile; calyx 40-45-veined, 10-15 mm, glabrous, lobes ovate, 3-4 mm; petals deep pink to scarlet or purple, bearded, 10-15 mm, apex dentate. Capsules 8-10 mm, slightly shorter than calyx. Seeds 1.6-2 mm. 2n = 30, 60 (both Europe).

introduced; Mich., N.H., N.Y., Wis.; Europe.

Flowering summer.

Disturbed areas, fields; 200-400m.

Dianthus carthusianorum, commonly known as Carthusian pink, is a species of Dianthus, native to Europe, from Spain north to Belgium and Poland, and east to Ukraine, occurring in dry, grassy habitats at elevations of up to 2,500 meters (8,200 ft) in mountains.

It is a variable herbaceous perennial plant growing to 60 centimeters (24 in) tall. The leaves are slender, up to 7 centimeters (2.8 in) long and 5 millimeters (0.20 in) broad. The flowers are 18–20 millimeters (0.71–0.79 in) wide, dark pink to purple, occasionally white; they are produced several together in tight flowerhead.