Abstract
An anatomical study ofOchna wallichii Planch,O. kirkii Oliver andO. squarrosa Roxb. shows that sclereids are totally absent fromO. squarrosa. Exclusively brachysclereids occur in the cortical region of the mature stem of the other two species. They occur in sub-epidermal rows and groups in the cortex. They are more abundant in the nodal regions, and form with the bast fibres a more or less continuous peripheral mechanical tissue cylinder. The adult empty sclereids which are oval or round inO. wallichii and a little squarish inO. kirkii have a thick, lignified, lamellated secondary wall traversed by pit-canals. Sclereid features are important in distinguishing the secondary woods of these species.
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