160 BOTANY. 



respects, they are so unlike in the characters of the pis- 

 til ; the borages, though agreeing essentially with the La- 

 biatae in the characters of the pistil, can not be classed 

 with them, because of their differences in so many other 

 respects. 



At any rate, you now see that the structure of the 

 ovary is not characteristic of the Labiatse. To identify 

 the members of this group, we have to bear in mind sev- 

 eral characters, which you are prepared to do if you have 

 examined and compared the plants named above. When 

 you find a plant with a two-lipped corolla, square stem, 

 and opposite leaves, joined with a deeply-lobed ovary and 

 basic style, you need not hesitate to place it among La- 

 biatse. 



In the same way, at the beginning of the Flora (p. 186) 

 are given the characteristics of all the natural orders of 

 our common flowering plants. Try to refer to its order 

 every flowering plant you meet with, and you will soon 

 find yourself, without effort, referring plants at once to 

 their proper ordinal group. 



You have now examined a good many species of 

 plants belonging to four different natural families the 

 Composite, the Cruciferae, the Umbelliferse, and the La- 

 biatse. Can you tell whether their leaves are parallel- 

 veined or net-vjeined ? Have you ever seen a parallel- 

 veined cruciferous plant ? Have composite plants, as far 

 as you know, parallel-veined or net-veined leaves ? Try 

 to find whether the leaves in the plants of these orders are 

 alike in their venation. 



Order XII, of Chart III, exhibits the characters of the 

 Labiatse. 



