The woods of C. indica and C. sativa differ significantly 
in each feature listed in Table 1. 
Vessels in C. indica tend to occur in radial chains; 
whereas those of C. sativa usually occur singly (as illus- 
trated in Hayward, 1948). That difference in distribution 
can be seen in Figs. 1-2. Vessel members are angular 
to round in transection. ‘They have simple perforation 
plates, and the end walls are slightly oblique. Pits are 
alternate with elliptic borders. Pit apertures are elon- 
gate; they are 6-9 » long in C. indica and 4-8 p» in C. 
sativa. 
Vessel members and wood fibres differ between the 
two samples in average width, length and cell wall thick- 
ness (Table 1). In C. indica, both cell types are wider, 
have thicker walls, but are shorter in length compared 
to those of C. sativa. 
Fibres in the secondary xylem must not be confused 
with the hemp fibres of commerce, which are phloem or 
bast fibres. Wood fibres of C. indica are typical, lignified 
libriform fibres. Fibres in C. sativa differ in two respects. 
They are dimorphic, with successive tangential bands of 
Taste 1. Averaged measurements on wood anatomy in Cannabis. 
Feature C. indica C. sativa Significance 
level@ 
vessel number per group 3.05 1.39 ” 
vessel member width, / 68.52 62.16 * 
vessel member wall thickness, 4 3.50 2.30 = 
vessel member length, 209.71 244,54 at 
fibre width, /@ 18.41 14,28 eK 
fibre wall thickness, - 3.44 0.68 = 
fibre length, » 281.10 443.47 sii 
ray width (cell number) 2.23 1.63 a 
ray height, mm 0.87 0.68 * 
* Analysis of variance (F test): * = p < .05, ** = p < .001 
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