COROLLA. 



27 



pull away all of it except the scaly-looking pieces at the 

 bottom (b b) . 



Fig. 26. 



155. These pieces (b b) which are the calyx, glumes, 

 tegmina, of different authors, are to be considered in 

 the light of true bractea ; in some cases there is only 

 one piece present, and the bractea is then said to be 

 one valved. 



156. Now within these valves of the bractese were 

 contained the flowers you pulled out, which, in this 

 case, were 5 or 6 in number. The bracteae are then 

 called many -flowered ; sometimes there are more flowers, 

 at others many less, the bractese being often only one- 

 flowered. 



157. Take one of the flowers (g in a, fig. 26) and se- 

 parate it from its centre, and you will find it composed 

 of two scaly pieces, (c, d,) the inner scale (d,) being 

 somewhat pressed within the other ; these are the co- 

 rolla, perianthium, palese, &c., &c., of authors. They 

 are to be considered as true floral envelopes, and as 

 they form only one covering, the term perianthium ap- 

 pears to be the best ; (c,) is the outer valve, and (d,) 

 the inner valve of the perianth. 



158. Sometimes the outer valve of the perianth has 

 a bristle-like appendage, (e,} this is called an arista or 

 awn, the perianth then being called awned or aristate. 



159. Within the valves of the perianth you will find 

 at the swelled base of the feathery-looking stigmas, two 



