Abstract
Nicotiana plumbaginifolia Viv. (Tex-Mex tobacco) is recorded from Karachi as a rare winter weed in flower beds and growing
as road-side plant near plant-nurseries and along sewerage lines. Data on its plant size and the leaf characteristics, based on sample
size of 120 leaves, are presented here. Measured Leaf area of radical leaves varied from 24.44 to 126.03 cm2
(mean 80.8 ± 5.86 cm2
;
CV = 34.04%) and for cauline leaves from 0.61 to 124.36 cm2
(mean: 22.29 cm2
; CV = 126.38%). The regression coefficients were
computed from multiple regression to fit in the allometric model – Y = a + b1X1 + b2 X2, where Y is the true leaf area (LA) and X1 and
X2 were leaf length and leaf breadth, respectively. The predictive equation was as follows:
Log e LA = - 0.38295 + 0.88962 Log e L + 1.06053 Log e B ± 0.098195
t = -5.72 t = 17.97 t = 29.04
p < 0.00001 p < 0.00001 p < 0.00001
R
2 = 0.9953; Adj. R2
= 0.9952; F = 12241.7; r = 0.9976
OR
LA = antilog [-0.38295.L 0.88962.B 1.06053]
