Weed flora of Pir Mehr Ali Shah Arid Agriculture University Rawalpindi: winter aspect.
Weeds inventory survey was conducted in the PMAS-Arid Agriculture University, Rawalpindi campus during October, 2007 to February, 2008. Plant specimens were collected, dried, pressed and mounted on sheet and deposited in the Department of Botany, Pir Mehr Ali Shah Arid Agriculture University, Rawalpindi. The status of each taxa was determined by taking frequency percentage. During the survey, a total of 42 weed species belonging to 37 genera and 18 families were identified. Among them, 27 species were dicot and 15 monocot. Poaceae was found to be the most dominant family in the campus that contributed 30.95% followed by Amaranthaceae (14.29%), Euphorbiaceae and Fabaceae (9.52% each). Most of the species recorded were annual (54%), followed by perennial (29%) and biennial (17%). The most common species were Alternanthera pungens Linn., Cannabis sativa Linn., Convolvulus arvensis Linn., Euphorbia hirta Linn., Malvestrum coromendilianum (Linn.) Garcke, Oxalis corniculata Linn., Parthenium hysterophorus Linn. and Tribulus terrestris Linn.