Urtica is a genus of flowering plants in the family Urticaceae. Many species have stinging hairs and may be called nettles or stinging nettles, although the latter name applies particularly to Urtica dioica.
Urtica species are food for the caterpillars of numerous Lepidoptera (butterflies and moths), such as the tortrix moth Syricoris lacunana and several Nymphalidae, such as Vanessa atalanta, one of the red admiral butterflies.[2]
The generic name Urtica derives from the Latin for sting.[3]
Urtica species grow as annuals or perennial herbaceous plants, rarely shrubs. They can reach, depending on the type, location and nutrient status, a height of 10–300 centimetres (3.9–118.1 in). The perennial species have underground rhizomes. The green parts have stinging hairs. Their often quadrangular stems are unbranched or branched, erect, ascending or spreading.
Most leaves and stalks are arranged across opposite sides of the stem. The leaf blades are elliptic, lanceolate, ovate or circular. The leaf blades usually have three to five, rarely up to seven veins. The leaf margin is usually serrate to more or less coarsely toothed. The often-lasting bracts are free or fused to each other. The cystoliths are extended to more or less rounded.
In 1874, while in Collioure (south of France), French botanist Charles Naudin discovered that strong winds during 24 hours made the stinging hairs of Urtica harmless for a whole week.[4]
In New Zealand, U. ferox is classified among poisonous plants, most commonly upon skin contact.[5]
The last common ancestor of the genus originated in Eurasia, with fossils being known from the Miocene of Germany and Russia, subsequently dispersing worldwide. Several species of the genus have undergone long distance oceanic dispersal, such as Hesperocnide sandwicensis (native to Hawaii) and Urtica ferox (native to New Zealand).[6]
_Urtica_thunbergiana_20220406201651.jpg)
A large number of species included within the genus in the older literature are now recognized as synonyms of Urtica dioica. Some of these taxa are still recognized as subspecies.[7] Genetic evidence indicates that the two species of Hesperocnide are part of this genus.[6]
Species in the genus Urtica, and their primary natural ranges, include:
Due to the stinging hairs, Urtica species are rarely eaten by herbivores, but rather provide shelter for insects, such as aphids, butterfly larvae, and moths.[9]
Fabric woven of nettle fiber was found in burial sites in Denmark dating to the Bronze Age, and in clothing fabric, sailcloth, fishing nets, and paper via the process called retting (microbial enzymatic degradation, similar to linen processing).[10] Other processing methods include mechanical and chemical.[11]
Urtica is an ingredient in soups, omelettes, banitsa, purée, and other dishes. In Mazandaran, northern Iran, a soup (Āsh) is made using this plant.[12] Nettles were used in traditional practices to make nettle tea, juice, and ale, and to preserve cheeses, such as in Cornish Yarg.[10][13]
Nettles have many folklore traditions associated with them. The folklore mainly relates to the stinging nettle (Urtica dioica).
Milarepa, the great Tibetan ascetic and saint, was reputed to have survived his decades of solitary meditation by subsisting on nothing but nettles; his hair and skin turned green and he lived to the age of 83.[14]
The Caribbean trickster figure Anansi appears in a story about nettles, in which he has to chop down a huge nettle patch in order to win the hand of the king's daughter.[15]
An old Scots rhyme about the nettle:
Coo, cow, and stoo are all Scottish for cut back or crop (although, curiously, another meaning of "stoo" is to throb or ache), while "laich" means short or low to the ground.[16] Given the repetition of "early," presumably this is advice to harvest nettles first thing in the morning and to cut them back hard [which seems to contradict the advice of the Royal Horticultural Society]. Alternatively, it may be recommending harvesting early in the year before the plants grow tall, as they become tough and stringy later.[17]
The English figure of speech "grasp the nettle", meaning to nerve oneself to tackle a difficult task, stems from a belief that nettles actually sting less if gripped tightly. This belief gave rise to a well-known poem by Aaron Hill:
In Hans Christian Andersen's fairy-tale "The Wild Swans," the princess had to weave coats of nettles to break the spell on her brothers.
In the Brothers Grimm's fairy-tale "Maid Maleen", the princess and her maid must subsist on raw nettles while fleeing their war-ravaged kingdom. While standing in for the false bride during the wedding procession, she speaks to a nettle plant (which later proves her identity):
.jpg)
{{cite web}}: CS1 maint: url-status (link) {{citation}}: CS1 maint: multiple names: authors list (link) Urtica is a genus of flowering plants in the family Urticaceae. Many species have stinging hairs and may be called nettles or stinging nettles, although the latter name applies particularly to Urtica dioica.
Urtica species are food for the caterpillars of numerous Lepidoptera (butterflies and moths), such as the tortrix moth Syricoris lacunana and several Nymphalidae, such as Vanessa atalanta, one of the red admiral butterflies.
The generic name Urtica derives from the Latin for sting.
