ELEMENTS OF" STRUCTURAL BOTANY. 



39 



50. Catnip. Note carefully the appearance of the 

 stem. It is sijumr.. 



The flowers are iu axillary clusters. The calyx is a 

 tube (Fig. 57) terminatiug in five sharp teeth, and you 

 may observe that the tube is a little longer on the up- 

 per side (that is, the side towards the stem) 

 than on the lower. The corolla is some- 

 what peculiar. It has somewhat the ap- 

 pearance of a wide open mouth, and is 

 known as a Uthiute or two-lipped corolla. 

 The upper lip is erect, and notched at the 

 apex. The lower lip spreads outward, and Fig. 57 

 consists of a large central lobe and two small lateral 

 ones. Altogether, therefore, there q.vq fice lobes cousti.- 

 tuting the gamopetalous corolla. Pull out the corolla, 

 and with the point of your needle spKt its tube in front. 

 On laying it open, the stamens will be found to be in- 

 serted upon it"(epipetalous). They are four in number, 

 two of them shorter than the other two. 

 Hence they are described as didynamous. The 

 anthers are peculiar in not having their lobes 

 parallel (Fig. 58), these being wide apart at 

 the base, in consequence of the expansion of 

 the collective, the name given to that part of 

 the anther which unites its two lobes or cells. 

 The pistil consists of a two-lobed stigma, a y 

 long style, and an ovary which seems at first 

 as if made up of four distinct carpels (Fig. 59). 

 But the single style and the two-lobed stigma 

 will warn you against this supposition. The 

 ovary really consists of tno carpels, each of two 

 deep lobes, and, as the seeds ripen, these lobes 

 form four little nutlets (Fig. 60), each contain- fjJ. 59. 

 ing a single seed. 



Fig. 58. 



