The weed flora of Californian rice fields

Barrett, S.C.H. and Seaman, D.E. (1980) The weed flora of Californian rice fields. Aquatic Botany, 9 (4). pp. 351-376.

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The origin and present composition of the flora of California rice fields is discussed. About 62 species of aquatic vascular plants have been recorded of which 2/3rds are native. Seventeen of the 20 alien species are of Old World origin and several (Cyperus difformis, Dopatrium junceum, Echinochloa crus-galli, Scirpus mucronatus, Monochoria vaginalis, Oryza rufipogon, Ottelia alismoides and Rotala indica) are widely distributed and well-documented weeds associated with rice. It is proposed that the most likely method by which these species have been introduced to California is as seed contaminants of imported rice stocks. The small seed size, annual life form and autogamous breeding systems of the majority of these species probably aid in their dispersal, establishment and colonization of rice fields. A survey of 70 rice fields indicated that the annuals Sagittaria montevidensis ssp. calycina, Ammannia coccinea, Bacopa rotundifolia and taxa in the Echinochloa crus-galli complex are the most abundant and widely distributed rice weeds in California. From summary

Item Type: Article
Author Affiliation: Department of Agronomy and Range Science, University of California, Davis Rice Exp. Sta., Biggs, CA 95917, USA
Subjects: Plant Protection
Divisions: Other Crops
Depositing User: Mr B Krishnamurthy
Date Deposited: 19 May 2012 06:36
Last Modified: 19 May 2012 06:36

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