Table 3.

Correlations of alkamides (alk) and cichoric acid (cic) contents between the roots and the nearly matured seed heads (NMSH) (R and H), between the roots and the young tops (R and T), and in the roots, the NMSH, and the young tops of Echinacea purpurea (n = 30 plants).

Parameter	Total alk	Alk 8 and 9	Cic	Alk and cic^z	Total alk and alk 8 and 9^y
R and H	0.0792^NS	−0.1670^NS	−0.0032^NS	0.0438^NS
R and T	−0.2182^NS	0.0353^NS	−0.4363^*	0.4894^**
R				−0.1999^NS	0.4827^**
T				−0.1873^NS	0.9844^**
H				−0.1845^NS	0.9705^**

For correlation between R and H or R and T, alkamides were from the roots.

Dodeca-2E, 4E, 8Z, 10E-tetraenoic acid isobutylamide and dodeca-2E, 4E, 8Z, 10Z-tetraenoic acid isobutylamide (alkamides 8 and 9).

^NS,*,**Nonsignificant or significant at P < 0.05 or 0.01, respectively.