Fig. 6

Stem density of 5-cm stem segments that included 1, 2, and 3 or more (3+) nodes within the segment. For each box (grey), the center line represents the median, the grey box represents 25 and 75% data boundaries, the whiskers represent 10 and 90% data boundaries, and black circles represent the 5 and 95% data boundaries. For some species and node numbers, sample sizes precluded the calculation of all of these parameters. Same sizes are included for each box in the parentheses within a panel. For three species, there were significant differences in stem density among segments with different numbers of nodes (Jc F_2,33 = 3.60 P = 0.038, Qr F_2,33 = 5.82 P = 0.007, and Ra F_2,33 = 3.44, P = 0.044) and there was no differences for the fourth species (Pt F_2,33 = 0.65 P = 0.530). Within a panel, different letters indicate significant differences in stem density with the number of nodes. Species abbreviations are included in Table 1