X PREFACE. 



personate, spurred. Stigma two-lipped. Caps, globose, of one cell. 

 Seeds fixed to a central receptacle. 



*•* Perianth double, inferior, monopetalous , irregular. Seeds four, 

 apparently naked (closely covered by the pericarp, Gymnospermous ). 



5. Lycopus, Linn. Gypseywort. — Cal. tubular, five-cleft. Cor. 

 tubular, limb nearly equal, four-cleft, upper segment broader, and 

 notcbed. Stam. distant, simple. 



6. Salvia, Limi. Sage or Clary. — Cal. two-lipped, tubular. Cor. 

 labiate, tbe tube dilated upwards and compressed. Filaments witb 

 two divaricating branches, one only bearing a perfect single cell of an 

 anther. 



**«* Perianth double, superior. 



7. CiRC/EA. Linn. Enchanter's Nightshade. — Cal. two-leaved, but 

 united into a short tube at the base. Cor. of two petals. Caps, two- 

 celled ; cells one-seeded. 



***** Perianth single, or none. 



8. Fraxinus, Linn. Ash. — Cal. O, or four-cleft. Cor. O, or of four 

 petals. Caps, two-celled, two seeded, compressed and foliaceous at 

 the extremity. Seeds solitary, pendulous. (Some flowers without 

 stamens.) 



9. Lemna, Linn, Duckweed. — PerianM single, monophyllous, mem- 

 branaceous, urceolate. Fruit utricular. 



10. Cladii'M, Schrad. Twig-rush. — Perianth single, glumaceous. 

 Glumes of one piece or valve, one-flowered, imbricating ; outer ones 

 sterile. Fruit a nut, with a loose external coat, destitute of bristles at 

 the base. 



This extract from the British Flora makes it evi- 

 dent that in determining to what genus a plant be- 

 longs, a great deal of inquiry beyond the discovery 



