Dictamnus albus, commonly known as Burning Bush, Gas Plant, Fraxinella, or Dittany, is a species of flowering plant in the citrus family Rutaceae. Native to southern Europe, North Africa, and much of Asia, it is a long-lived herbaceous perennial known for its attractive flowers, aromatic foliage, and unique flammability under specific conditions.
Description
Dictamnus albus typically grows to a height of 30 to 90 cm (12 to 35 inches). It has:- Leaves: Pinnate, glossy, dark green, and strongly aromatic when crushed, resembling ash tree leaves (hence "Fraxinella," meaning "little ash").
- Flowers: Borne in showy, upright racemes during late spring to early summer. The individual flowers are zygomorphic (bilaterally symmetrical), with five petals, and range in color from pure white to pink or lilac, often with prominent dark purple venation.
- Stems and Seed Pods: The stems are covered in glandular hairs. After flowering, star-shaped seed pods develop, which burst open explosively to disperse seeds when ripe.
A distinctive characteristic of Dictamnus albus is its production of volatile essential oils, particularly limonene and anethole, which are released from its glandular hairs. On hot, still evenings, especially during flowering, these oils can concentrate in the air around the plant. If ignited (e.g., with a match), the resulting brief flash of flame (often described as a "flash fire") is visible, but the plant itself is typically unharmed, leading to its common name "Burning Bush" or "Gas Plant." This phenomenon is most reliably observed under specific atmospheric conditions and is generally more pronounced in older, established plants.
Habitat and Cultivation
Dictamnus albus thrives in well-drained soils and prefers full sun to partial shade. It is often found in rocky areas, dry grasslands, and open woodlands. Once established, it is very drought-tolerant and long-lived, making it a valuable plant for perennial borders and xeriscaping. It is generally slow to establish from seed and resents transplanting due to its deep taproot.Uses
- Ornamental: The plant is widely cultivated in gardens for its aesthetic appeal, including its striking flowers, attractive foliage, and the curiosity of its flammable oils.
- Traditional Medicine: Historically, Dictamnus albus has been used in various traditional medicines, particularly in Europe and Asia. Extracts were used for conditions ranging from fevers to digestive issues. However, modern scientific evidence supporting these uses is limited, and its use is cautioned due to its chemical compounds.