Dark blue snakeweed
Stachytarpheta cayennensis, Fam. Verbenaceae
Clumping perennial woody-based sub-shrub to about 2m tall. Stems four-angled and generally purplish.
Other invasive plants
Invasive plants that are not prohibited or restricted invasive plants, but are known to spread readily and cause negative impacts, within the region.
|Form or habit:||Shrub|
Simple, opposite or sometimes alternate, oval or lance-shaped, thin textured and usually sparsely hairy leaves..
|Flower description:||Dark purplish blue flowers with paler centres are borne on slender spikes, up to 30 x 2.5mm.|
|Fruit description:||Dry, enclosed in floral remnants, turning dark brown to black and splitting at maturity into two, 1 seeded segments.|
|Food source for:|
|Toxicity:||No toxicity known|
|Origin:||Tropical and subtropical|
|Notes:||Spread by: seeds; contaminated soil and in contaminated pasture seed or fodder. Invades/threats: degraded pastures, cropland and disturbed or abandoned areas, woodland on any soil type. Notes: originally introduced as a garden ornamental. Its presence usually indicates past disturbance; it spreads rapidly by seeds and is favoured by overgrazing, either by native or introduced animals. Environmental weed.|
|Information sources:||Mackay Regional Pest Management Group (2018) Weeds of the Mackay Whitsunday Region Second Edition.|