Fig. 3.

Biomass allocation and haustorium formation in Pedicularis rex and P. tricolor (as indicated in the key). (A) Ratios between the dry weight (DW) of fine rootlets (<0·5 mm in diameter) and total root DW, (B) root:shoot (R:S) ratios, (C) total number of haustoria produced per gram of dry root and (D) number of presumably functional haustoria (PFH) produced per gram of dry root. Data are presented as the mean ± s.e. of four replicates. Statistical analyses were performed separately for the two Pedicularis species. * Indicates a statistically significant difference at the P < 0·05 level. Treatments (nutrient solutions based on Long Ashton solution): N, nitrogen; P, phosphorus; K, potassium; ‘–’ indicates absence of the nutrient in the solution; ‘2’ indicates doubled concentration of the nutrient in the solution.