Appearance
"Dactylorhiza sambucina" reaches on average 10–40 centimetres of height. These plants are "bulbous geophytes", as they bring their buds in underground tubers or bulbs, organs that annually produce new stems, leaves and flowers. Furthermore these orchids are "terrestrial", because unlike "epiphyte" species do not live at the expense of other plants of major sizes.This orchid has a short, quarrying and tubulous stem. The leaves are amplexicaul and vary from 4 to 7, the lower ones are oblong-obovate with obtuse apex, while the upper leaves are lanceolate with acute apex. Size of leaves: width 1 to 2.5 cm, length 6 – 12 cm.
The underground part of the stem has two webbed tubers each one more or less deeply divided into several lobes or tubercles, the first one plays the important functions of supplying the stem, while the second one collects nutrient materials for the development of the plant that will form in the coming year.
The inflorescence is 5–10 centimetres long and it is composed of flowers gathered in dense spikes. The flowers are placed in the axils of bracts membranous and lanceolate-shaped. The flowers reaches on average 10–15 centimetres and bloom from mid-April to early July. Their colors vary from yellow with light reddish stains or purple speckled with darker spots on the labellum.
They are hermaphrodite and pollinated by insects entomophily, especially bumblebees. These orchids are almost without nectar, but they are visited by various pollinator insects as they are confused with other plants with nectar. The seeds germination is conditioned by the presence of specific fungi.
Naming
The name of the genus "Dactylorhiza" is formed from Greek words δάκτυλος "daktylos" meaning "finger" and ρίζα "rhiza" meaning "root" and refers to the tubers of this plant, that are split into several tubercles. The specific Latin name "sambucina", should refer to the smell of "Elder" emanating by some plants of this species.The scientific binomial name of this plant was initially "Orchis smabucina", proposed by the Swedish naturalist and botanist Carl von Linné in 1755. The name has been subsequently amended to the one currently accepted, by the Hungarian botanist Károly Rezső Soó in 1962. In German this plant is called "Holunders-Knabenkraut", in French is called "Orchis à odeur de sureau", in Italy is called "Orchide sambucina".
Distribution
This orchid is quite common and widespread throughout central and southern Europe.
Habitat
The "Elder-flowered Orchid" prefers fresh or dry meadows, light woods and clearings or scrubland. They grow on siliceous and calcareous substrate, at an altitude of 300–2,000 metres above sea level.References:
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