EXPLANATIONS OF THE FORMULA. ' 65 



one taken from another series of terms which are proposed 

 for expressing, in a brief manner, the usual situations of the 

 species, with respect to shade or exposure, humidity or 

 diyness, the mechanical condition of the soil, and propin- 

 quity to the haunts of man and animals. The proposed 

 series of terms runs thus : — 



1. Pratal. — ^Plants of meadows, or rich and damp grass- 



lands. Examples : Geranium pratense, 

 Rumex Acetosa, Phlemn pratense, Ophio- 

 glossiun vulgatum. 



2. Pascual. — Plants of pastures and grassy commons, 



where the herbage is usually less luxu- 

 riant than in the meadow-lands. Ex- 

 amples : Trifolimn repens, AchUlsea Mil- 

 lefolium, Prunella vulgaris, Au-a cristata. 



3. Ericetal. — Plants of moors and heaths. Examples : 



Calluna, Erica, Carex binervis, Scirpus 

 caespitosus. 

 . 4. Uliginal. — Plants of swamps, or boggy ground. Ex- 

 amples : Drosera, Pinguicula, Vaccini- 

 um Oxycoccus, Rubus Chamsemorus. 



5. Lacustral. — Plants usually immersed in water, or 



floating on its sm-face. Examples : Nym- 

 phsea, Utricularia, Potamogeton, Subula- 

 ria. 



6. Paludal. — Plants of marshy ground, the roots of which 



are in water or wet ground most part of 

 the year, or constantly. Examples : 

 Typha, Sagittaria, Thalictram flavmn, 

 Parnassia. 



7. Inundatal. — Plants of places liable to be inundated in 



wet weather, but often dry in summer. 

 Examples : Pulicaria, Rumex acutus, 

 Nasturtium ten-estre, Ranunculus hirsutus. 



K 



