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Scale bar 10mm. Copyright CSIRO
Cotyledon stage, epigeal germination. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Leaves and Flowers. Copyright CSIRO
Hyptis pectinata (L.) Poit.
Poiteau, P.A. (1806) Ann. Mus. Par. vii.: 474. Type: ?.
Comb hyptis; Hyptis, Comb
Usually flowers and fruits as an erect herb but may reach 4 m.
Leaf bearing twigs +/- 4-angled, twigs and leaves aromatic or not aromatic when crushed. Leaf blades about 2-8 x 1-4.5 cm. Hairy on both leaf surfaces, usually denser on underside.
Inflorescence a 6-15-flowered cyme. Calyx about 2.5 mm long, 10-ribbed, lobes linear, all parts of the outer surface of the calyx clothed in hairs. Corolla white to pale blue or pink-tinged, 3-3.5 mm long.
Cotyledons about 3-5 x 4-6 mm, reniform. First pair of leaves opposite, margins crenate with about 3-5 teeth, upper and lower surfaces of the leaf blade hairy. At the tenth leaf stage: crushed plant parts emit an odour like that of mint (Mentha sp.) leaf margin irregularly serrate. Leaf petiolate. Stem square in transverse section.
Distribution and Ecology
An introduced species originally from tropical America, which has become naturalized in NEQ. Altitudinal range near sea level. Usually grows along roadsides, under powerlines and other disturbed areas.
A serious tropical weed.
Herb (herbaceous or woody, under 1 m tall)
Shrub (woody or herbaceous, 1-6 m tall)