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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However, so as to avoid crop damage, lower rates of application are recommended for use on sandy soils Siwicki, ; Thomson, In order to restrict the plant’s introduction or spread via emsx intervention, E. The plant produces many seeds with a hard, prickly casing.
Its species name, ‘spinosa’ is Latin for ‘prickly or thorny’ and presumably refers to its achenes. You can help Wikipedia by expanding it.
Stems are decumbent to erect Zohary,radiating from the crown in all directions and branching dichotomously at periodic nodes. Scott JK; Beasley P, Control of Emex species. Docks and Knotweeds of the British Isles. Synonyms Rumex spinosus L. Achenes are dimorphic with large mg and not very spiny subterranean smex formed, attached to the crown near the neck of the root and smaller Environmental Requirements A prerequisite to invading a new habitat is the ability to tolerate the new climatic conditions.
Chemical control of Emex sp. Bulletin of Entomological Research, 82 3: Photoperiod and temperature effects on growth and development of Emex australis and E. The plant develops a long and thick taproot. Editions des Conservatoir et Jardin botaniques de la Ville de Geneve.
Branched tendrils NA Hair between stem nodes the stem has no hairs between eme 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 spijosa the base of the flowering stem Plant height 30—80 cm Tendril origin NA Tendrils the plant does not have tendrils.
Each achene contains a single, trigonous seed. Biological Control, 13 3: These symptoms were referred to as “doublegee decline” but were later found to be caused by an aphid, Brachycaudus rumexicolens, thought to be native to North Psinosa and an insect that was not intentionally introduced into Australia Berlandier and Scott, ; Scott et al. The initial and rapid production of a few large, non-dispersing subterranean achenes ensures that the fittest progeny reappear at a site that has already proven itself to be suitable for the species.
Bischof makes a general comment that E.
Morphologie, Geobotanik, Oekophysiologie, Physical damage to the subterranean achene stimulated germination and the authors consider this to be a ‘last chance’ event, seedlings being produced just prior to the seeds losing viability.
Fullaway notes that in Hawaii, cattle dispersed E.
It should, however, also be affecting E. Habitat Top of page E. Description Top of page E. Plants listed as noxious or as pest plants inand Emex australis a and E. Sometimes Confused With Chorizanthe pungens: Cotyledons are linear in E. Bracteole number Apiaceae 0 Bracts in plantain Plantago NA Final leaf segment length compound lvs only 0 mm Final leaf segment length to width ratio compound lvs only 0 Hairs on underside of leaf the underside of the leaf is not hairy, or it has very few hairs Leaf arrangement alternate: When viewed from the side with the pedicle pointing towards the ground, the mature aerial achene in E.
Graham, ; Agnew, ; Holm et al. emxe
spiny emex, Emex spinosa Polygonales: Polygonaceae
Don’t need the entire report? Weiss and Simmons studied the effects of photoperiod and temperature on growth and development in E. Due to the more erect morphology of E. These germination pre-requirements, together with the ability of the aerial achenes to disperse widely and to remain viable for many years, permit the plant to colonize areas that are only periodically suitable for successful reproduction, thereby reducing the possibility of competition, whilst ensuring germination only occurs in favourable microhabitats such as buried near the surface during favourable seasons, i.