Facts About. Spiny threecorner-Jack is native to Mediterranean Africa, but has made its way around the world. It has a patchy distribution in the U.S. and is. Emex spinosa (spiny emex, devil’s-thorn) is an annual (family Polygonaceae) found on California’s south coast. This Mediterranean native is not yet common in . Emex Campd. Environment. terrestrial. Original description. Not documented. Taxonomic citation. WoRMS (). Emex spinosa. Accessed at.

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Grazing land problems, Molokai Island, Territory of Hawaii. Archived from the original on Views Read Edit View history.

Emex spinosa – Wikipedia

Parsons lists products that are registered for use on E. Naturally disturbed areas colonized by E. Similar species Emex australis Steinh.

Glands on leaf blade the leaf blades do not have glandular dots or scales Spinoda the sap is clear and watery Sap color the sap is clear. Docks and Knotweeds of the British Isles.

Emex spinosa is able to colonize and then persist and even thrive within extremely hostile and unpredictable habitats primarily because of the two types of achenes i. Three sided, each side with 6—10 depressions in upper portion, arranged in 2 columns, and 2 depressions in lower portion; all the lower depressions together form a tapered base.


The plant produces many seeds with a hard, prickly casing. Dicamba is registered for the control of E. E,ex Tolerances Top of page Soil drainage free Soil reaction acid alkaline neutral Soil texture heavy light medium Special soil tolerances infertile.

Emex spinosa

Branched tendrils NA Hair between stem nodes the stem has no hairs between the nodes Hairs between stem nodes the stem has no hairs between the nodes Hooked hairs on stem between nodes no Leaves on stem there is at least one full leaf above the base of the flowering stem Plant height 30—80 cm Tendril origin NA Tendrils the plant does not have tendrils. Crop Protection, 22 2: Polygonoideae Flora of Lebanon Plants described in Polygonaceae stubs. The leaves are plain in shape, resembling spinach.

In order to restrict the plant’s introduction or spread via human intervention, E. Toward the apexeach edge of outer segments forms a rigid recurved spine. The spiny female flowers are sessile and form in axillary clusters in the axils of the leaves forming first on the crown about a month after the seed has germinated and whilst the plant is still a rosette Evenari et al.


On the Hawaiian Islands, E. Current research on plant pathogens as biocontrol agents for weeds of Mediterranean origin. Bulbils the plant does not appear to have bulbils Bulblets replace flowers there are no bulblets where the flowers are located. Jalas and Suominen mapped the regions in southern Europe where E. Apionidae in southern Africa: The lesser jack tends to grow as a sprawling weed. Biological control of weeds.

Proceedings of the 9th Australian Weeds Conference, At the end of the plant’s life, the root dries up and pulls the seeds at the base of the stem into the ground.

Subterranean achenes are produced in low numbers under all conditions maximizing the progeny’s fitness and competitiveness whilst sacrificing some colonizing characteristics. This page was last edited on 15 Decemberat Journal of the Australian Institute of Agricultural Science, 40 2: A and B are more prone to resistance than others Preston, Chromosome numbers of the Portuguese flora. A Geographical Atlas of World Weeds.

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