Leucas aspera (PROSEA)
Leucas aspera (Willd.) Link
- Protologue: Enum. hort. berol. alt. 2: 113 (1822).
- Herbe à mouches (Fr)
- Indonesia: ngangegan (Javanese)
- Philippines: karukansoli, pansi-pansi (Tagalog), paysi-paysi (Bisaya)
- Cambodia: phlom ang kep
- Thailand: phak hua to, yaa hua to (south-western), yaa nok khao (northern)
- Vietnam: mè dất nkám.
L. aspera is distributed from India, the Mascarenes, Burma (Myanmar), Thailand and Indo-China to Peninsular Malaysia, Java, Madura, Sulawesi, the Philippines and Papua New Guinea.
In general, the leaf sap of L. aspera is used to treat sores of the eyes and nose. In the Philippines, the bruised leaves are considered to be active against bites of poisonous insects, and in India, the smoke of dried leaves is used as an insecticide and repellant.
An annual herb, 30-60 cm tall, stem and branches hispid, with preading hairs; leaves linear-lanceolate, 4-6 cm × 0.8-1 cm, margin remotely crenate, membranaceous, tomentose on both surfaces, petiole 0.5-1 cm long, densely hispid; inflorescence composed of flowers in terminal verticillasters, forming a globular head, 1.5-2.5 cm in diameter, bracts narrowly lanceolate, 8-10 mm long, ciliate along the margins, calyx tubular, 8-9 mm long, only slightly enlarged in fruit, tube pilose, 10-veined, 10-toothed, mouth strongly oblique, teeth erect, posterior one largest, corolla 15-16 mm long, strongly curved, with a hairy ring inside near the middle, upper lip 2 mm long, densely velutinous, lower lip 6 mm long, sparsely pubescent; nutlets narrowly ovoid, 2.5 mm × 0.8 mm, ventral surface triquetrous, dorsal side rounded, finely granulate or nearly smooth, black. L. aspera occurs in various habitats, from seasonal to perhumid areas, mostly grassy plains, as a weed in arable crops, open dry sandy soils, waste places, teak forest, railway embankments, dunes, locally often common, from sea-level up to 500 m altitude.
- Council of Scientific and Industrial Research, 1948-1976. The wealth of India: a dictionary of Indian raw materials & industrial products. 11 volumes. Publications and Information Directorate, New Delhi, India.335, 529, 788, 801, 810, 890, 939, 1001, 1035.