ty 
ERRATA 
31, second paragraph, line 4, for 500 read 5c00. 
126, line 5 from bottom, for p=o. 500 read r=o. 500. 
214, line 7 from bottom, for 0’ read b. 
220, line 7, for pod read pa 
222, line 22, for Linneaus’ Apt Linnaeus’. 
300, line 10 from bottom, for S. Rare read S. glaucescens. 
300, last line, for (fig. 8) read (fig. 6). 
318, line 11, for represent read represents. 
355, line 17, for dropper read runner. 
382, line 2, for Alpanes read A planes. 
