Parthenium Hysterophorus & X28;Parthenium Weed& X29;. Parthenium Hysterophorusã‚ Is A Much-Branched, Short-Lived & X28;Annual& X29;, Upright & X28;Erect& X29; Herbaceousã‚ Plant That Forms Aã‚ Basalã‚ Rosetteã‚ Of Leaves During The Early Stage Of Growth. It Usually Grows 0.5-1.5 M Tall, But Can Occasionally Reach Up To 2 M Or More In Height. Mature Stems Are Greenish And Longitudinally Grooved, Covered In Small Stiff Hairs & X28;Hirsute& X29;, And Become Much Branched At Maturity. Theã‚ Alternately Arrangedleaves Are Simple With Stalks & X28;Petioles& X29; Up To 2 Cm Long And Form Aã‚ Basalrosetteã‚ During The Early Stages Of Growth. The Lower Leaves Are Relatively Large & X28;3-30 Cm Long And 2-12 Cm Wide& X29; And Are Deeply Divided & X28;Bi-Pinnatifid Or Bi-Pinnatisect& X29;. Leaves On The Upper Branches Decrease In Size And Are Also Less Divided Than The Lower Leaves. The Undersides Of The Leaves, And To A Lesser Degree Their Upper Surfaces, Are Covered With Short, Stiff Hairs That Lie Close To The Surface & X28;They Areã‚ Appressedã‚ Pubescent& X29;.

KEYWORDS

0515 212 330 abasalrosetteduring abasalrosetteof also annual areappressedpubescent arrangedleaves become bipinnatifid bipinnatisect branched branches can close covered decrease deeply degree divided early erectherbaceousplant form forms greenish grooved grows growth hairs heightmature hirsute hysterophorus hysterophorusis large leaves lesser lie long longitudinally lower maturitythealternately much muchbranched occasionally parthenium petioles reach relatively short shortlived simple size small stage stages stalks stems stiff surface surfaces tall undersides upper upright usually weed wide