56 BRITISH BOTANY. 



Root tapering. Stem erect, succulent, angular, leafy, simple. 

 Root-leaves oblong-obovate, tapering at tlie base and petioled; 

 stem-leaves oblong, toothed or sinuated, sagittate at the base, 

 with short, acute lobes. Pouch large, orbicular, nearly flat, with 

 a broad membranous border, notched or somewhat two-lobed at 

 the apex; cells 5-8-seeded. Seeds striated. 



In rich or somewhat moist fields. Annual ; May-September. 

 A rather uncommon plant. 



Sect. II. Pouch obovate, more or less cvmeate (wedge-lite) at the base. 



T. perfoliatum, Lin. Perfoliate Penny Cress. — e.b. 2354. 

 L.B.S. 61. 



A. 2. C. 3. Lat. 51-52°. Alt.? Tern. 48°? 



Stems solitary or numerous, simple or branched, leafy below, 

 erect or ascending, glabrous-glaucous. Root-leaves obovate, ta- 

 pering at the base and petiolate ; stem -leaves deeply cordate at the 

 base, oblong, mostly toothed. Pouch obovate, somewhat twgid, 

 concave on the upper side, bordered by a membranous rim (wing) , 

 which does not quite reach the base, notched at the apex and 

 crowned with the short style. Seeds smooth. 



Annual; April-May. Li mestone_ _pastures ( old quarrie s) in 

 Oxfordshire and Gloucestershire. 



T. alpestre, Lin. Alpine Penny Cress. — e.b. 81. l.b.s. 63. 

 A. 8. C. 12. Lat. 50-57°. Alt. 200-800 yds. Tern. 47-40°. 



Stems erect or nearly erect, glabrous and slightly glaucous, 

 4-10 inches high, leafy. Root and lower leaves obovate or spa- 

 thulate ; the upper leaves ovate-lanceolate, clasping the stem with 

 blunt auricles. Clusters of flowers dense, of the fruit lax and 

 elongate. Sepals spreading, about half as long as the petals. 

 Petals narrow and blunt at the summit. Pouch obovate, cuneate 

 at the base, notched at the apex ; style equalHng or surpassing 

 the lobes. y j 



On mountainous pastures. North of England and Scotland. 

 Perennial ? June- September. 



T. occitanum, Jord., differs slightfy in the foliage, which is 

 less glaucous than in T. alpestre ; also in the form of the pouch, 

 which is rather broader than in the above. The shortened clus- 

 ters of fruit and the elongated styles are the characters relied on; 

 and these, if constant, might be sufficient to distinguish the forms 

 of this plant. In Yorkshire and North Wales. 



