Table 1. Elemental concentrations in the rhizosphere and in the bedrock in the natural habitat of Phyllanthus balgooyi, Phyllanthus securinegioides and Rinorea bengalensis values as ranges and means in μg g⁻¹ and *wt% dry weight).

Species	n	Rhizosphere soil chemistry
		pH	Mg (total)*	Mg (exch.)	P (total)	K (total)	K (exch.)	Ca (total)	Ca (exch.)
Phyllanthus balgooyi	3	6.4–6.5 [6.4]	6.93–9.92 [8.58]	1040–3520 [1970]	82–180 [140]	153–179 [163]	32–100 [57]	180–1500 [640]	340–3320 [1590]
Phyllanthus securinegioides	9	5.6–7.3 [6.6]	3.33–14.71 [7.56]	510–6120 [2732]	44–590 [200]	36–328 [102]	17–200 [67]	90–7720 [3750]	450–4440 [1600]
Rinorea bengalensis	6	6.6–7.6 [7.1]	0.20–5.40 [2.45]	710–4790 [2190]	45–540 [200]	32–144 [91]	21–310 [120]	63–9240 [2820]	360–3460 [1330]
Species	n	Cr (total)	Mn (total)	Fe (total)*	Co (total)	Co (DTPA)	Ni (total)	Ni (DTPA)	Ni (Sr(NO3)2
Phyllanthus balgooyi	3	420–440 [430]	1432–2330 [1770]	5.42–7.71 [6.35]	170–560 [360]	16–68 [40]	1620–3960 [2480]	180–290 [220]	4.2–48 [20]
Phyllanthus securinegioides	9	1240–6050 [3080]	1427–6460 [3010]	4.03–18.55 [9.83]	240–710 [430]	5–24 [15]	1080–5450 [2570]	21–200 [88]	2.1–15 [7.4]
Rinorea bengalensis	6	1920–10980 [4710]	2200–7330 [4060]	7.92–39.60 [16.12]	210–690 [350]	4–24 [11]	2160–4410 [3110]	21–440 [150]	3.4–17 [9.2]
Species	n	Bedrock chemistry
		Na*	Mg*	Al*	Si*	P	S*	K*	Ca*
Phyllanthus balgooyi	3	0.02–0.15 [0.08]	38–46 [42]	0.4–4.5 [2.5]	16–20 [18]	11–72 [42]	0.04–0.1 [0.07]	0.01–0.01 [0.01]	0.8–2.4 [1.6]
Phyllanthus securinegioides	3	0.01–0.13 [0.06]	7.0–46 [29]	0.2–2.8 [1.3]	13–20 [17]	30–52 [38]	0.05–0.1 [0.07]	0.01–0.03 [0.02]	0.2–1.7 [0.7]
Rinorea bengalensis	2	0.12–0.20 [0.16]	9.0–18 [14]	0.7–2.4 [1.6]	2–21 [12]	38–76 [57]	0.06–0.09 [0.07]	0.01–0.03 [0.02]	1.8–2.6 [2.2]
Species	n	Cr	Mn	Fe*	Co	Ni	Cu	Zn	Mo
Phyllanthus balgooyi	3	750–2830 [1790]	1170–5770 [3470]	6.0–10 [8.2]	9.2–20 [15]	1110–1390 [1250]	0.7–35 [18]	54–120 [85]	1.0–1.5 [1.2]
Phyllanthus securinegioides	3	850–2230 [1730]	890–2540 [1630]	1.9–8.5 [5.9]	9.0–11 [10]	1030–1610 [1380]	8–14 [10]	49–59 [55]	1.2–1.6 [1.4]
Rinorea bengalensis	2	1661–2630 [2140]	930–1300 [1120]	4.3–4.6 [4.5]	6.8–8.8 [7.8]	970–1220 [1090]	43–50 [47]	46–68 [57]	0.9–1.3 [1.1]

The digests and extracts were analysed with ICP-AES. Abbreviations: ‘ICP-AES’ is Inductively Coupled Plasma Atomic Emission Spectroscopy), ‘Total’ is extractable with HCl/HNO₃ digest, ‘DTPA’ is extractable with Diethylenetriamine pentaacetic acid solution, ‘Exch.’ is extractable with silver thiorea solution, and ‘Sr(NO₃)₂’ is extractable with strontium nitrate solution.