Root : Small, 4-5 cm long, 0.5-2 mm thick, cylindrical, ribbed, gradually tapering, having a
few secondary roots, pale brown; fracture short; odour and taste indistinct. Microscopically,
young roots shows exfoliated, single layered epidermis. Mature root shows cork, composed
of 10-12 layers of thin-walled rectangular cells; secondary cortex consists of 4-6 layers of
oval, elliptical, parenchymatous cells; oval to elongated, elliptical, thick-walled, lignified
cells with wide lumen. Groups of stone cells and a few fibres are present in this region.
Stem : Slender, glabrous, cylindrical, 1-3 mm thick, internode 1-1.5 cm long, light yellow;
fracture short, odour and taste indistinct. Transvrse section of the stem shows a single
layered epidermis compoed of thick-walled, flattened, tangenmtially elongated cells.
Older stme shows 4-5 layers of cork composed of thin-walled, rectangular,
tangentially elongated and radially arranged cells.
Leaf : 1.7-7 cm long, 0.2-0.8 cm wide, sessile, linear-lanceolate or linear oblong,
sub acute, base rarely rounded or sub-cordate; greenish-yellow; odour and taste
not distinct. Transverse section of midrib shows slightly convex outline; epidermis
singl elayered, covered externally with thick, striated cuticle.