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.
|Published (Last):||11 October 2004|
|PDF File Size:||8.6 Mb|
|ePub File Size:||19.77 Mb|
|Price:||Free* [*Free Regsitration Required]|
Screening is made difficult because achene size in E. Within the desert habitats of Israel, Evenari et al.
Australian Seeds Research Conference, 2 a Fruit an achene enclosed in persistent hardened perianth4—8 mm long, 2. Plant and seed population dynamics of Emex. Siddiqi reports that on each of the three flat faces between spines are six small pits, although the actual number of small pits can vary with pits per face being reported in Parsons and Cuthbertson Each achene contains a single, trigonous seed.
WoRMS – World Register of Marine Species – Emex spinosa
The genus name Emex is thought to be derived from Rumex, the genus in which it was originally placed, and the Latin word ex, ‘out of’ Shivas and Sivasithamparam, Host range of Brachycaudus rumexicolens Patchand aphid associated with the Polygonaceae.
The Australian populations did, however, vary in their multilocus genotypes, suggesting that there have been at least four separate eemx of the plant into Australia. Kosinova found E. Only low numbers of subterranean achenes are produced emrx plant and this occurs whilst the plant is still at the rosette stage Evenari et al.
In the late s and early s, farmers in Australia reported E.
Emex spinosa – Wikipedia
Bulletin of Entomological Research, 82 3: The spiny fruits of Emex spinosa and Emex australis distinguish this small genus of only two species from RumexFagopyrumand Polygonum. The presence of a proportion of achenes with long-term innate dormancy also results in a seed bank that can persist for years Evenari et al.
The male flowers, together with the occasional perfect flower, form in short axillary racemes, often emerging between the female achenes Zohary, Associations In the Negev, Israel, E. Upland Kenya wild flowers. The plant develops a long and thick taproot.
To overcome the problems in using knapsack sprayers for spinoaa application, a ‘drizzle’ method has been zpinosa in which concentrated droplets of herbicides are squirted as a fine jet stream from up to 5 m away from the target weed which breaks up into large, sparsely distributed droplets that then drizzle onto the plant. Pathogens of Emex australis Steinheil and their potential for biological control.
Journal of Range Management, 5: Cotyledons are hairless and linear and the first leaf is oval with an acute apex Gilbey and Weiss,whereas subsequent leaves are more triangular with an indented, heart-shaped base Wilding et al.
Emex spinosa is an erect, annual herb, up to 40 cm tall. 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 aerial achenes are triangular in cross section with their spines arranged so that one spine always points outwards. Australian Journal of Biological Sciences, Similar species Emex australis Steinh. The state of weed infestation and the possiblities of weed control in sugarbeet plantations in Libya Stan zachwaszczenia i mozliwosci zwalczania chwastow na plantacjach burakow cukrowych w Libii.
Three inner segments form an erect, connivent apex taller than spines.
Proceedings of the international workshop on combating desertification: The adult plant has stems that are round, ribbed and sometimes reddish. Risk of Introduction Top of page There is a high risk of further accidental introduction of E.
Subterranean achenes are produced in low numbers under all conditions maximizing the emed fitness and competitiveness whilst sacrificing some colonizing characteristics. In Sousse, Tunisia, E.