QUADRATS 



169 



the decimeter interval is small, and the centimeter square which corresponds 

 is divided into twenty-five tiny squares. Each plant is put in whenever pos- 

 sible, but mats, turfs, and mosses are merely outlined in mass if the individ- 

 uals are not distinguishable. This holds true of all large rosettes and mats, 

 even when they are single plants. Symbols were formerly used for indicat- 



Fig. Z:l. Chart of the quadrat shown in figure 51. Legend: a, Aiid- 

 rosace cJiamaejasme; c,Carcx rupestris; t, Tetrancuris lanata; p, Potcn- 

 tilla rubncaulis; as, Arenaria sajanensis ; ar, Artemisia scopulorum; 

 ag, Agropyrum scribncri; sa, Silene acatilis; st, Sievcrsia turbinata; d, 

 Dasyphora fruticosa; al. Allium retictilatnm; o, Oreoxis alpina. 



ing the various species. They have the advantage of requiring little space 

 on the chart, and the disadvantage of necessitating constant reference to the 

 legend. They are at present replaced by initials. By this plan, the decap- 

 italized first letter of the generic name is used if no other genus found in the 

 quadrat begins with the same letter. If, however, two or more genera begin 

 with a, for example Agropyrum, Anemone, and Allium, the most abundant > 



