Nettle family

What does Nettle family look like?

Members of the nettle family range from green herbs and shrubs to hemi-epiphytes and rare trees. Most bear simple leaves with stipules, and many feature cystoliths or silicone deposits. Stinging hairs often defend the foliage against plant-eating mammals and invertebrates. When touched, the sharp tips break off and embed in skin, injecting an irritating fluid containing histamines and acetylcholines. Flowers are typically unisexual with a perianth of four to five parts. Male flowers release pollen explosively when drying stamens snap straight in warm temperatures, sending pollen grains into the air. The resulting fruits are dry achenes.

Where does Nettle family come from?

Plants in this family grow wild across the world, with the greatest concentration found in tropical ecosystems, especially tropical Asia. The family has a long fossil record based largely on preserved fruits and leaves. Twelve species known from fossil achenes date to the Late Cretaceous in Central Europe, representing modern genera like Boehmeria, Debregeasia, and Pouzolzia alongside the extinct Urticoidea. Fossil leaves resembling the tribe Cecropieae have been found in Maastrichtian deposits in Colombia. Furthermore, Eocene fossils from the Allenby Formation in the Okanagan Highlands preserve distinct stinging hairs along their stems and veins.

When and how Nettle family blooms

Pollination occurs through the wind after stamens dry in the heat and trigger an explosive release of pollen. Beyond stinging trichomes, some species produce latex within their bark to deter herbivores, or form mutual relationships with ants, as seen in many Cecropia species. When grown or kept in collections, these plants are vulnerable to several parasitic pathogens. Known ailments include bacterial leaf spot from Xanthomonas campestris, anthracnose caused by Colletotrichum capsici, water mold infections such as Phytophthora blight, and fungal diseases including Myrothecium leaf spot and southern blight.

How Nettle family is used

People gather and cultivate various nettle species for food, tools, and herbal treatments. In southern African countries, Pouzolzia mixta, known as soap nettle, is used as a culinary herb, twisted into rope, and taken as traditional medicine. In eastern Asia, Urtica angustifolia plays an important role in traditional Chinese medicine. In Brazil, healers use species such as Cecropia obtusa, Laportea aestuans, and Urera baccifera to address inflammation and diabetes. Common stinging nettle, Urtica dioica, has also been applied traditionally for conditions including gout, arthritis, anemia, and eczema.

Kinds of Nettle family

Botanists classify approximately 2,625 species in this family across 53 genera. The largest genera include Pilea with up to 715 species, Elatostema with around 300, Urtica with 80, and Cecropia with 75. Notable cultivated and foraged plants in the group include ramie, māmaki, and ajlai. While some relatives like Pellionia and Parietaria grow as herbs or low shrubs, others develop into hemi-epiphytes, and genera such as Cecropia and Dendrocnide can grow as trees.

What Nettle family means

The nettle family is well known for its painful stinging defenses, evolved to deter browsing animals. While most stings cause short-lived skin irritation without serious danger to health, rare species can be far more hazardous. Stings from the tree species Dendrocnide cordata and Urtica ferox have been documented to cause human fatalities. Across tropical forests, myrmecophyte species in the genus Cecropia demonstrate unique ecological partnerships by housing and living alongside ant colonies.

Questions people ask about Nettle family

Good reading and sources

• Encyclopaedia BritannicaArticle
• Plants of the World OnlineRoyal Botanic Gardens, Kew, Plant database
• Where it has been recordedGBIF, Plant database
• Sightings and photos by naturalistsiNaturalist, Plant database

• Urticaceae on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data