Petra iris

What does Petra iris look like?

Petra iris is a compact perennial with a small brown rhizome and waxy, sword-shaped grey-green leaves that form low tufts up to 25 cm tall. Its flower stalks rise above the foliage, bearing large blooms 5–7 cm across. The flowers are deep shades of burgundy, brown, or purple, sometimes appearing almost black. Each flower has three large outer petals (falls) with a nearly black patch and a row of orange, yellow, or dark-tipped hairs called the beard, plus three upright inner petals (standards) with dark veining.

Where does Petra iris come from?

This iris grows wild in the sandy deserts and loess plains of southern Jordan and the Negev region of Israel, often near Tafilah and Yeruham. It was first described in 1933 from plants found between Ma'an, Syria, and Amman. The species is named after Petra, the ancient city in Jordan. Over time, its populations have declined due to habitat loss and grazing, and it is now protected in places like the Yeruham Iris Nature Reserve.

When and how Petra iris blooms

Petra iris blooms from February to April, after the spring rains. It thrives in well-drained sandy soils and desert margins, preferring dry conditions, especially in summer. The plant can be grown from seed or by dividing its rhizomes. After flowering, it produces seed capsules whose seeds are dispersed by wind and collected by ants, which are attracted to the fleshy coating on the seeds.

How Petra iris is used

This iris is admired for its unusual dark flowers and is sometimes grown in gardens with suitable dry conditions. In the wild, it is a symbol of the desert landscape and is protected as an endangered species in Israel. All parts of the plant are poisonous if eaten and can cause skin irritation, so it is not used for food or medicine.

Kinds of Petra iris

The Petra iris is sometimes confused with Iris nigricans, and populations in the Negev and around Yeruham were once thought to be a separate species (Iris hieruchamensis), but are now considered the same. Its flower color can vary from deep burgundy to dark violet, with some appearing nearly black depending on light.

What Petra iris means

The Petra iris is a regional emblem of the desert areas where it grows and is listed as endangered in Israel. It is protected in reserves like the Yeruham Iris Nature Reserve. The species is not on the IUCN Red List, but local conservation efforts aim to preserve its unique desert habitat and striking flowers.

Where Petra iris is used and seen

BouquetA creative arrangement of flowers, given or displayed for many occasionsHakone Botanical Garden of WetlandsA garden of wetland and alpine plants in Hakone, JapanParc floral de ParisA botanical garden and flower park in the Bois de Vincennes, ParisParc Floral de la SourceA large public garden in Orléans built around the source of the Loiret riverKeukenhofA vast Dutch flower garden famous for its spring tulip displaysKanzashiTraditional Japanese hair ornaments, often crafted as folded silk flowersHanafudaJapanese playing cards with flower designs used for traditional gamesHistory of flower arrangementHow arranging flowers became an art across cultures and centuries

Questions people ask about Petra iris

Good reading and sources

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

• Iris petrana on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data