23
May
2010
Helianthemum nummularium - Rock Rose
Trees and shrubs | Magnoliopsida
8
0

Scientific Name - Helianthemum nummularium

Synonyms - Helianthemum vulgare Gaertner, Helianthemum chamaecistus Mill

Popular names - iarba osului, eliantemo maggiore, eliantemo giallo dorato, rock rose..

Distribution and Habitat - grows naturally throughout Europe meridional center of the sea up to alpine regions, arid soils, rocks, limestone.

Description - perennial species, undergrowth, evergreen. Prostrata strain, ascending, wood, 40 inches tall. Stipelate leaves, opposite, lanceolate-ovata, dark green top, bottom tomentoasa, edge revoluta. Flowers yellow, rarely white, grouped in Cima racemiforma. Calyx persistent, 5 sepals, sepals three internal and two external ovata smaller linear. Corola with five yellow petals. Blooms in May-September. Fruit oval capsules, three valves. Seeds ovoid, 1.5 x 1.1 mm, brown to violentlet brown. 2n = 20.

Requirements - exhibitions sunny soil slightly alkaline, well drained.

Management - Past flowers trimming encourages new growth.

Cultivars - 'Eloise' blooms in May-June, yellow with an orange eye.

Properties and Uses - are doing very well with dranaj rocarii excellent.

Leaves harvested in April-May before flowering, contain tannins, salicilico acid, potassium salt.

Curiosity - scientific name, Helianthemum numularium, derived from the Greek term Helios = sun and the Latin word indicating the currency, numumus = currency, because the flowers that shimmer in the sun like a gold currency.

Pozele realizate pe Colli Euganei (IT).

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