PREFACE. 



He has also read my manuscript upon the other families and given me 

 much valuable assistance and advice. 



The present flora is but a "report of progress" preliminary to a COM- 

 PLETE FLORA, which will be published as soon as the territory is carefully 

 worked up so that such a flora is possible. To make this work easier 

 the present edition has been made a pocket flora, suitable for field work. 

 Alternate leaves have been left blank for notes and the species have 

 been numbered. The plants believed to be native are printed in bold- 

 faced type, while introduced plants are printed in small capitals. 



The discovery of a new plant or of a new locality for a plant not 

 marked "common," "abundant" or "frequent," should be carefully noted 

 on the blank leaf opposite the genus to which it belongs, with date, 

 locality, its abundance, and any other valuable or interesting facts. 



Specimens should be pressed, and preserved either in your own or your 

 school herbarium, and a duplicate sent either to the Lackawanna Insti- 

 tute at Scranton, to Wyoming Seminary at Kingston, or to the West 

 Pittston High School. Credit for all such discoveries will be given 

 in the complete flora when published. 



Much remains to be done, especially among the aquatic plants of our 

 ponds, marshes and streams. Our summary shows that less than a 

 thousand species of plants are known to grow without cultivation in our 

 territory ; the total should be at least two hundred larger. 



Many plants believed to be common, as Thalictrum polygamum, are 

 reported from Wyoming Valley alone, others are reported from Lacka- 

 wanna Valley only. 



Such plants can be easily worked up by beginners, while the more 

 advanced students should form botany clubs, and the work should be 

 given out by families; in this way more rapid advancement can be 

 made both in our knowledge of the flora and in the botanical knowledge 

 of the student. 



Among the many places, mentioned by the teachers and botanists 

 of the valleys, as especially worthy of a visit, are the Archbald "pot- 

 holes" and White Oak Creek, both near Archbald; Elk Mt., north west 

 of Carbondale; Bald Mt., easily reached from Scranton; Campbell's 

 Ledge, and Falling Spring, near West Pittston; the Ice Cave Gorge 

 above Luzerne; Tilbury Knob, opposite Nanticoke; Penobscot Knob, 

 its summit and southern ledges ; the lake east of Glen Summit ; Lehigh 

 Pond ; Lake Henry ; Sink-hole Marsh, Ararat ; and the pond opposite 

 Duryea. It might be added that a visit to any pond, marsh or mountain 



