FLORA OF WASHINGTON AND VICINITY. 59 



6. The dates given are usually those of flowering, except in case of 

 the Carices, when they indicate the time of fully-developed perigynia, 

 and in the Cryptogams, where it is aimed to show the period of devel- 

 oped spores. As before remarked, they are compiled from actual dates 

 at which the plants have been collected or observed, due allowance 

 being made for the condition of each specimen when collected. While, 

 therefore, many of them may doubtless be found at other dates, the 

 collector will usually be safe in keeping within the limits noted. Where 

 an exact date is stated, this implies that the plant has only been found 

 once and on that date ; or if two such dates are given, these are the 

 only times the species has been seen. 



7. The date of fruiting is only stated where this is important to the 

 collector, i. e., where it is necessary or preferable that the fruit be col- 

 lected at a particular time. Where fruiting follows naturally upon 

 flowering, or where the fruit persists so as to be obtainable at any time 

 in the fall or winter, these facts are not specially stated unless they are 

 in some manner peculiar to this locality. 



8. In genera embracing a number of species to all of which the com- 

 mon name will apply, this is only given for the first, e. g., Pycnanthemum 

 linifolium^ Mountain Mint; the designation "Mountain Mint" being 

 equally applicable to P. incanuni, P. clinopodioides, or any other species. 



9. Species with the dagger (t) prefixed occur under the same or some 

 other name in Brereton's Frodromus. 



