Fig. 3. Temperature datalogger readouts from the winters of 1996–97 and 1997–98, showing rhizosphere and leaf temperatures of clusters of Dichanthelium lanuginosum plants. A, Rhizosphere temperatures of plants adjacent to (5–10 cm) a hot springs outflow stream located in the Rabbit Creek thermal area (Fig. 1, site 5) of YNP. B, Plants on a steaming ground site in the Amphitheater Springs thermal area (Fig. 1, site 1) of YNP, showing simultaneous rhizosphere (upper tracing) and leaf (lower tracing) temperatures.