Secondary Growth

Secondary Growth - of a young Tilia(basswood stem The Leaf The leaf consists of the(generally flat blade one or more leaf veins a petiole and

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Secondary Growth Secondary growth is produced by a cambium . It occurs in rows or ranks of cork , secondary xylem or secondary phloem cells. Cork cells (produced by a cork cambium ) are technically part of the epidermis, and contribute to the bark of woody stems. Dicot secondary growth occurs by growth of vascular cambium , to complete a full vascular cylinder around the plant. Secondary xylem is produced to the inside of the vascular cambium, secondary phloem to the outside. The living parts of the woody plant are next to the vascular cambium. Cross-section of a young stem of basswood. Note the primary growth in cross section
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Unformatted text preview: of a young Tilia (basswood) stem. The Leaf The leaf consists of the (generally) flat blade, one or more leaf veins, a petiole , and usually an axillary bud . The petiole can be long (as in celery and bok-choy) or short (as in cabbage and lettuce). Leaves may be simple or compound : simple leaves have a single subdivision or leaflet, compound leaves have more than one leaflet. Leaves attach to stems at nodes ( internodes are the spaces between nodes). Leaf phyllotaxy is the pattern exhibited (spiral, opposite, alternate, whorled) of leaf attachment to a stem....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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