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Trichomes morphology of 53 species representing 28 genera of the family Labiatae (Lamiaceae) have been examined by light and scanning microscope. With in the family various types of trichomes are found. Trichomes are generally eglandular, uniseriate (2-3 celled) rarely glandular. In some species both types of trichomes are observed. In the family Labiatae four types of trichomes are found. Small trichomes with pointed tips, soft long ribbon like trichomes with blunt apex or arrow tip, long conical trichomes with pointed tip and stellate often branched trichomes. In many genera both types of trichomes are found (long and short). Usually conical trichomes with pointed tips are common. Similarly, trichomes are distinct in trichomes base also. On the basis of trichomes morphology family is divided in to six group I: Uniseriate macroform trichomes– type, II: Uniseriate microform trichomes-type, III: Uniseriate macro & microform trichomes-type, IV: Unicellular moniliform trichomes -type, V: Stellate trichomes -type and VI: Branched trichomes– type. Trichomes morphology is significantly helpful at the specific level.
Anjum Perveen. (2006) MICROMORPHOLOGICAL STUDIES OF THE FAMILY LABIATAE FROM PAKISTAN WITH SPECIAL REFERENCE TO TRICHOMES AND ITS USE AS A TAXONOMIC EVIDENCE, , Volume 3, Issue 2.
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