46 ELEMENTS OF STRUCTURAL BOTANY. 



instead of the tuft of silky hairs (technically called the 

 pappus) which surmounts the ovary, there may be, as 

 in Sunflower, a few teeth-like projections, or scales, or 

 a mere rim hardly to be distinguished at all. 



63. The Order is easily recognized by the following 

 characters : 



1. The flowers, or florets, are in heads on a common re- 



ceptacle, and surrounded by an involucre. 



2. The stamens are inserted on the corolla, and are 



united by their anthers (syngenesious ). 



3. The style is %-loled at the apex. 



64. Representatives of this Family are so numerous 

 that it is needless to give a list. Specimens exhibiting 

 all the variations in regard to the corollas, pappus, &c., 

 should be gathered and notes made of their structure. 

 In Part IT. will be found a very full account of all the 

 species likely to be met with, and the exercise book has 

 a number of blank schedules specially arranged for Com- 

 posites. 



65. Catnip. Note carefully the appearance of the 

 stem. It is square. 



The flowers are in axillary clusters. The calyx is a 

 tube (Fig. 59), terminating in five sharp 

 teeth, and you may observe that the tube is 

 a little longer on the upper side (that is, the 

 side tc wards the stem) than on the lower. 

 The corolla is somewhat peculiar. It has 

 somewhat the appearance of a wide-open 

 mouth, and is known as a labiate or two-lipped Fig. 59. 

 corolla. The upper lip is erect and notched at the apex. 



Fig. 59. Flower of Catnip. 



