Leaf : Leaves are simple, 3-5 cm long, 0.6-2 cm broad; sessile,
obtuse, lanceolate to
ovate-lanceolate; margin entire or toothed around the apex,
unequal at base; both
surfaces pubescent, distinct small hairs more prominent near veins;
texture brittle, papery;
odour characteristic; taste astringent and slightly bitter. Transverse
section of midrib shows single
layered epidermis covered by thick, striated cuticle;
collenchyma 2-5 layered towards xylem,
1-3 layered towards phloem; beneath collenchyma 2-5 layers of
parenchyma present on both sides.
Central portion is occupied by a large vascular bundle, xylem facing
towards upper and phloem towards lower epidermis.
Root : Root 1 to 5 mm in diameter somewhat twisted and gradually
tapering. The external surface
is white when young while it is light to dark brown in mature one
and the wood is brownish. Odour
indistinct and fracture is short. Transverse section of mature root
shows cortex which is composed
of 3-5 layers of tangentially elongated, radially arranged cells.
Medullary rays are broad and funnel
shaped, multiseriate, 4-9 cells wide in phloem and 3-6 cells wide
in xylem region. Sub-spherical or elliptical cavities like resin canals are present in phelloderm, medullary
rays, wood region
and are surrounded by a layer of epithelial cells.