Table 3.

Correlation analyses between measured vein pattern and ground tissue traits in mid-portion of leaf in C₃ and C₄ Flaveria species

Correlated variables†	C3F. robusta	C4F. bidentis
Vein density vs. leaf length	− ***	− ***
Vein density vs. branching	+ ***	+ ***
Vein density vs. freely ending veinlets	+ ***	+ ***
Vein density vs. bundle sheath	− ***	− ***
Vein density vs. palisade mesophyll	− ***	− ***
Vein density vs. spongy mesophyll	− ***	− **
Palisade mesophyll vs. spongy mesophyll	+ ***	+ **
Bundle sheath vs. palisade mesophyll	+ ***	+ ***
Bundle sheath vs. spongy mesophyll	+ ***	+ *

^† Size based on medial cell diameter; *P < 0·05; **P < 0·005; ***P < 0·001.