PHILOSOPHICAL SOCIETY OF WASHINGTON. 107 



Salvia lyrata, Monarda fistulosa, and M. punctata; Nepeta glechoma, 

 Brunella vulgaris, Mertensia Virginica, Flox paniculata, and P. dir 

 varicata; Solatium Carolinense, and Asclepias cornuti. 



Of herbaceous Monochlamydece may be named Polygonum Virgin- 

 ianum, P. sagittatum, and P. dumetorum; Laportea Canadensis, 

 Pilea pumila, and Bozmelxria cylindrica. 



The Monocotyledons give us Arisazma triphyllum, the Indian 

 turnip, Sagittaria variabilis, Aplectrum hyemale, Erythronium Amer- 

 icanum, Luzula campestris, Juncus effusus, Juncus marginatus, and 

 Juncus tenuis, Pontederia cordata. 



Of the Cyperi, C. phymatodes, G strigosus and G ovularis are the 

 most common. Eleocharis obtusa and E. palustris; Scirpus pungens, 

 S. atrovirens, S. polyphyllus, and S. eriophorum, are very conspicuous. 

 Of Garices, C. crinata, C. intumescens, the various forms of C. laxi- 

 flora, C. platyphylla, C. rosea, C. scoparia, G. squarrosa, G. straminea, 

 C. stricta, G. tentaculata, G. virescens and G. vulpinoides, are the 

 most obtrusive. In the Graminece, those which most uniformly 

 strike the eye are Agrostis scabra, Muhlenbergia Mexicana, and M. 

 sylvatica, Tricuspis seslerioides, Eatonia Pennsylvanica, Poa pratensis, 

 Poa sylvestris, and P. brevifolia,; Eragrostis pectenacea, Festuca 

 nutans, Bromus ciliatus, Elymus Virginicus, Danthonia spicata, An- 

 thoxanthum odoratum, Panicum virgatum, P. latifolium, P. dichotomum, 

 (with a multitude of forms,) and P. depauperatum ; Andropogon 

 Virginicus, and A. scoparius. 



Of ferns Polypodium vulgar e, Pteris aquilina, Adiantum pedatum, 

 Asplenium ebeneum, and A. Filix-jozmina ; Phegopteris hexagonoptera, 

 Aspidium acrostichoides, A. marginale and A. Noveboracense ; Os- 

 munda regalis, 0. Claytoniana, and 0. cinnamonea, are the most con- 

 stantly met with. 



Lycopodium lucidulum is quite common, and L. complanatum is 

 very abundant in certain localities. 



Besides the above, which are all indigenous to our flora, there 

 are many introduced species i-n the vicinity of the city, and of cul- 

 tivation everywhere which manifest here as elsewhere, their charac- 

 teristic tendency to crowd out other plants and monopolize the 

 soil. 



Such are t^e most general features which the traveler accustomed 

 to observe the vegetable characteristics of localities visited, may 

 expect to see when he pays his respects to the Potomac valley. To 



