Cape tulip (one-leaf)
|Common name:||Cape tulip (one-leaf)|
|Scientific name:||Moraea flaccida (Sweet) Steud.|
|Other scientific name/s:||Homeria flaccida Sweet|
|Other common name/s:|
Catchment management authority boundaries
Regionally prohibited in the Mallee and Goulburn Broken Catchments
Regionally controlled in the Wimmera, Glenelg Hopkins, North Central, Corangamite,North East, East Gippsland, West Gippsland, Port Phillip & Westernport Catchments
Restricted in no areas in Victoria
Herbaceous plant - Forb (flowering herbaceous plant - not a grass)
Cape tulip (one-leaf) is an erect perennial herb that grows from a bulb.
Stems are stiff, erect, somewhat zigzagged and branched near the summit 30-60 cm high.Corms (swollen, underground stems which stores food for the plant) are white, about 1-2 cm in diameter, enclosed in a light brown fibrous tunic. One to three new corms are produced above the old corm each year.
Cape tulip (one-leaf) usually only has one leaf per plant which is flat, ribbed, 1-2 cm wide and 1 m long.
Flowers of Cape tulip (one-leaf) are orange or salmon pink(occasionally yellow) with a yellow patch in the centre. They are 3-5 cm diameter and appear in small clusters at the ends of the branches. Flowers have six petal-like segments 2.6-4 cm long.
Green at first, turning brown when mature; a thin 3-valved capsule to 5 cm long, opening at the top to discharge numerous brown irregularly shaped seeds to 2 mm long
Seeds are brown, irregularly shaped that grow to 2 mm long.
Growth and lifecycle
Method of reproduction and disperal
The weed is dispersed mainly by the movement of corms and seeds which contaminate farm produce, machinery and attach to the wool and feet of animals.
The dried plants, with seed capsules still intact, break off at ground level and are blown about by wind and carried by running water. Movement of gravel or soil from infested sites can also spread the corms and seeds.
Another major method of dispersal of Cape tulip (one-leaf) occurs in hay or silage cut from infested paddocks.
Rate of growth and spread
Plants are two to three years old before they flower and set seed.
Seedbank propagule persistence
Dense infestations can produce up to 7,000 corms per square metre.
Seeds remain viable after passing through stock.
Seeds of Cape tulip (one-leaf) do not live long in the soil. Most germinate in the autumn following formation, and those that do not germinate during that season die.
Seeds germinate more readily on the soil surface than when buried. Seeds buried at 5 cm fail to produce seedlings. Corms show longer viability than seeds.
The weed can produce up to 150 seeds per capsule with eight capsules per plant amounting to 1,200 seeds per plant.
Cape tulip (one-leaf) prefers semi-arid and sub humid, subtropical scrublands on a wide range of soil types. It grows mostly in areas with annual rainfall of less than 600 mm and does not establish well in shaded sites.
In Victoria, the weed grows in isolated patches, although it is extensive in some cases throughout the Wimmera, Western District and around Melbourne.
The icons on the calendar below represent the times of year for flowering, seeding, germination, the dormancy period of Cape tulip (one-leaf) and also the optimum time for treatment.
Impact on ecosystems and waterways
Cape tulip (one-leaf) grows best in open environments, such as grasslands and pasture, where it competes with and replaces desirable plants.
The plant severely impedes the growth and regeneration of indigenous ground flora.
Aerial parts of the plant are only present for five to six months each year. However, the root system, while not deep, is fine and fibrous.
Agricultural and economic impacts
All parts of Cape tulip (one-leaf) are toxic, although it is thought that the green leaves are far more dangerous than other parts of the plant.
It is poisonous to cattle, sheep and goats but is generally avoided by grazing animals. This results in desirable pasture plants being replaced by this weed and stock not grazing valuable pasture that is growing within the infested area.
Social value and health impacts
All parts of the plant are poisonous if ingested.
Prescribed measures for the control of noxious weeds
- Application of a registered herbicide
Other management techniques
Changes in land use practices and spread prevention may also support Cape tulip (one leaf) management after implementing the prescribed measures above.
Carr, GW, Yugovic, JV and Robinson, KE. 1992, Environmental weed invasions in Victoria: Conservation and management implications, Department of Conservation and Natural Resources and Ecological Horticulture, Victoria.
Hawkins, C, Kruger, E & Lloyd, S. 2001, Cape Tulip. Farmnote 10/2001, Department of Agriculture, Western Australia.
Parsons, WT & Cuthbertson, EG. 1992, Noxious Weeds of Australia, Inkata Press, Melbourne, Sydney
Department of Primary Industries, Regionally Prohibited Weed Information Sheet - Cape Tulip (one-leaf), 2010.