iv PREFACE. 



To identify tlie plants with one pistil (§ S) and regu- 

 lar flowers (§ 9), we must proceed to § 10. Here we are 

 made aware that one of them, containing a yellow, milky 

 juice, has a two-sepalled calyx, while the other has more 

 than two sepals. In § 11, being directed to 12 and 13, we 

 find that our plant, having prickly leaves, is A^'gemone 

 Mexicmia^ L. As to the other 1-pistiliate, 5-sepalled 

 l)lant with regular flowers, we first apply to IG, and as it 

 is not a tree, to IT, from where, the j^lant having simple, 

 pitcher-form leaves, we proceed to 19, to learn that the 

 plant is called Sarracenia. 



To identify the last two plants of our first half dozen, 

 we return to § G ; and, whereas the stamens are united, 

 we are shown to § ^^. The filaments being united in 

 several bundles, we proceed to 7i. One of the plants has 

 the leaves opposite — it is Hypericum / the other one has 

 them alternate, and must be looked for in 75. The plant 

 under consideration has the peduncles of its flower-clnsters 

 adnate to the midrib of a leaf-like bract, and is therefore 

 T'llia^ the Linden. 



And now for the second half dozen ! 



In § 5 we are required to consult § 77. Here we as- 

 certain that one of the six plants has a double perianth, 

 while three others, one of them grass-like, have a simple 

 set, and the two last plants, one of them also gi-ass-like, 

 no perianth at all, or only a poor substitute of it in form 

 of bristles. 



Our plant with a double perianth obliges us to proceed 

 to § 78, from where, as the corollas of our specimen are 

 gauiopetalous, we are directed to 320. We ascertain 

 there that, as each flower has the ovary inferior, we must 

 proceed to 507. As our plant has no tendrils, we consult 

 § 508. We notice that there are three stamens in each 



