12
Jul
2010
Polemonium caeruleum
Flowers | Magnoliopsida

Scientific Name - Polemonium caeruleum L.

Synonyms -

Popular names - Greek valerian, Jacob's Ladder

Distribution and Habitat - originating in the mountains of Europe, wet meadows, from 1500-2300 m altitude.

Description - herbaceous perennial, rhizome white. Stem ribbed, hollow, 30-90 cm high, glabra hairy-glandular at the base and tapered. Basal compound leaves, 10-40 cm, 17-23 segments lanceolate, alternate leaves caulinare. Cimoase inflorescences, corymb, stems pubescent, 2-3 mm, calyx actinomorf, lacini acute, 2-4 mm Corola actinomorfa, white tube, lacinii subrotunde, patents, 11 x 10 mm, purplish at the base with three ribs in darker color, filaments equal in length, pubescent. Blooms in July-August. Fruit pear-shaped capsule, 4-6 mm. Seeds elliptical, 2.8-3.2 x 1.2-1.4 mm, surface slightly shiny, dark purple. 2n = 18

Tolerances - temperate-20 C sites.

Requirements - well-drained moist soil in sunny or semi-shade exhibitions.

Propagation - by seeds sown in spring cold greenhouse.

Cultivars - 'Album' White flowers, 'Blue Pearl' cobalt blue flowers with yellow center.

Properties and Uses - species used as ornamental plants in gardens with spontaneous or rock gardens. Are planted at 30 cm distance between plants.


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