INTRODUCTION 



and one-chambered, and contains three lateral rows of ovules. 

 These characters make us again t ,ra» to the Polypctalx aiiJ, 

 among them, to the Tiialam flora;, W'c soon see that the ov.iiy 

 does not agree with those describeri in. tlie Taljular View under 

 Orders i^ j, or, for that matter, 5 or 6, whilst the numerous 

 stamens at once make us pass over th-se last t>.vo Orders an i 

 pause at Order 7, the R.:seddceai, or Mignunette Family. Turning 

 to the fuller description of this group mi p 59, we again find but 

 one British genus, R-sc la, containing two wild species. The 

 undivided leaves and four sepals of t;ie plant befor.- us enable us 

 to decide between these two. It is R Liiuuia, the \\'eld or Dyer's 

 Rocket. 



COLHLE ■(ri.,\ d^,xic.\ {Daujsh S€2(7-:'y-^?ass). 



One more example will suffice. The plant to be examined is a 

 small annual herb growing near the sea ot m the m irshes bordering 

 some tidal river. Its leaves are rather floshv and have no stipules, 

 the lower ones are heart-shaped, and the upper ones, which have 

 short petioles, are deltoid or angular. Ttie white flowers with 

 four distinct green sepals, four white petals and six, stamens, of 

 which four are kjnger than the other two (tetradynamous), after 

 referring us, as before, in succession to Dic.'otyledons, to Polvpetala:, 

 and to ThalamiflorL-e, cause us, in running through the characters 

 of the Oiders, to pause at Order 6, th'e CriidfinT, or Cabbage 

 Family. This is a large Order containing more than twenty-five 

 genera, so we have to turn to the tahlt; of these genera on pp. 

 32 — 34- '^Ve may have some little difficlilty here ; but, if we find 



