36 Lackawanna Institute. 



this station apparently being on its northeastern limit. It is 

 rare in Pennsylvania, Professor Porter reporting it on the 

 Schuylkill below Norristown (its extreme eastern limit), 

 and as sparing^ on the lower Susquehanna. Near Moca- 

 naqua occurs Erysimum clieiranthoides, hitherto regarded as 

 peculiar to the Susquehanna below Harrisburg. 



Outside the valley proper are localities of presumable in- 

 terest to the botanist, because of their height and exposure ; 

 and they are near enough to be readily visited from Seranton, 

 but it is doubtful whether they will yield as much that is of 

 interest as the places already mentioned. Elk Mountain, ten 

 miles northwest of Carbondale, has two peaks, the South 

 Knob, 2575 feet, the Xorth Knob, 2700 feet above tide. A 

 single visit to this mountain in June revealed but few rare 

 plants. Panieum xanthophysum, between the knobs, may be 

 justly called so. It is not reported south of Luzerne County, 

 and occurs but sparingly from Massachusetts to Minnesota. 

 Sixteen miles north of Carbondale are Ararat Peak, 2600 feet, 

 and Sugar Loaf, 2450 feet above tide. These have not been 

 visited by myself. 



The illustrations given indicate that our limits include 

 many rare plants and a very great variety of soil and hab- 

 itat; and yet it will be seen that explorations have been 

 both hasty and incomplete. The promise is clearly great for 

 the discovery of as interesting forms as any yet found, and 

 there is, therefore, every incentive to this fascinating work 

 for those who can carry it forward. Let everyone interested 

 make it a point to press the plants secured, even the common 

 ones; and let duplicates of each species, accompanied by a 

 label giving exact date and locality, — even if the name be 

 omitted, — be placed in the hands of a curator appointed by 

 the Institute. From these labels a slip catalogue could be 

 easily made and kept by the curator, and he could direct 

 future searches for plants which ought to occur within limits, 

 but which have not been secured. In doing this it would be 

 wise to assign particular orders of plants to individuals and 

 make each responsible for work done in collecting the species 

 belonging to such orders. Let each specimen pressed be as 



