Transcript The Stem
The Stem Develops from plumule SHOOT: portion bearing leaves Node, Internode, bud, flowers Types( on the length of life) 1.Annuals 2.Biennials For one Season Wheat, Rice 2 seasons Radish, Turnip Istudy.pk 3.Perennials Many years woody plants Stem: types On the basis of size, habit, soft and woody Trees Herbs Shrubs Colummar Unbranched, Crown of leaves At top. Palm Excurrent Branched, max girdth Tapering towards apex Polyalthia Deliquescent Divide and Redivide Mango Stem: types Colummar Unbranched, Crown of leaves At top. Palm Excurrent Branched, max girdth Tapering towards apex Polyalthia Deliquescent Divide and Redivide Mango Stem: types On the basis of size, habit, soft and woody Herbs Soft stem, small in size Radish, Mint, Mustard Shrubs Woody, bushy in nature, stem branched near ground Rose, Jasmine Trees Tall, woody, perennials. Mango, Peepal Colummar Unbranched, Crown of leaves At top. Palm Excurrent Branched, max girdth Tapering towards apex Polyalthia Deliquescent Divide and Redivide Mango Stem: types On the basis of form and nature Herbacous Soft stem, small in size Radish, Mint, Mustard Woody hard Fistular Internode hollow Bamboo Jionted Swollen at internodes Grasses Succulent Thick and fleshy Opuntia Spiny Acacia Lateral Sides Terminal At the apex Axillary Axil of a leaf Accessory More than one in axil central one is Reduced Small green Radish Climbing upsupport Erect Forms Strong Weak Unable to erect 2. 3. Horizontal no daughter plants Horizontal, aerial shoots Grass Climbing upsupport Climbing upsupport Cuscuta Curved kooks Bougainvillia Prostrate, long internodes, nodes scale leaves. Bud develop into erect leafy shoots Underground erect Mint Elongated, distinct node and internode. Each node small bud Thread like, Cucumber Axillary branches hard and pointed. Orange Flowers Axillary buds into swollen Lilium Phyloclade and Cladodes Stem leaflike many nodes Single node cladodes (Asparagus)