Table 1 Floral traits and plant density of H. petelotii and H. limprichtii (mean ± SE). Statistically homogeneous groupings based on a one-way ANOVA

Flower length (mm)

29.93 ± 0.450 (N = 29)

42.36 ± 0.82 (N = 28)

185.826

P < 0.0001

Flower width (mm)

27.67 ± 0.36 (N = 29)

43.03 ± 1.09 (N = 28)

178.036

P < 0.0001

Spur length (mm)

16.37 ± 0.14 (N = 29)

19.61 ± 0.16 (N = 28)

233.372

P < 0.0001

Nectar volume (mm)

6.06 ± 0.34 (N = 29) (2.41–10.09)

4.88 ± 0.53 (N = 28) (2.37–15.56)

3.674

P = 0.06

Nectar sugar concentration (%)

14.80 ± 1.11 (N = 29) (13–19)

22.16 ± 0.67 (N = 28) (17–27.5)

32.271

P < 0.0001

Flowers per inflorescence

9.08 ± 0.48 (N = 133)

7.47 ± 0.24 (N = 196)

6.108

P = 0.0105

Floral longevity (days)

13.18 ± 0.35 (N = 60)

7.70 ± 0.14 (N = 54)

196.566

P < 0.0001

Plant density

2.8 ± 0.47 (N = 10) (1–5)

11.2 ± 1.03 (N = 10) (5–17)

55.125

P < 0.0001