FORMS OF FLOWERS 



131 



212. The five petals of the pansy, 

 detached to show the form. 



213. Flower 

 of catnip. 



not. Others lack the stamens but have pistils: these are 

 pistillate. Others have neither stamens nor pistils: these are 



sterile (snowball and hydrangea). 

 Those that have both stamens and 

 pistils are perfect, whether or not 

 the envelopes are missing. Those 

 that lack either stamens or pistils 

 are imperfect or diclinous. 

 Staminate and pistillate 

 flowers are imperfect or 

 diclinous. 



275. Flowers in which 

 the parts of each series 

 are alike are 

 said to be regular 



(as in Figs. 202, 203, 204, 205). Those in which 

 some parts are unlike other parts of the same series 

 are irregular. The irregularity may be in the calyx, 

 as in nasturtium (Fig. 211); in the corolla (Figs. 

 212, 213); in the stamens (compare nasturtium, 

 catnip (Fig. 213) sage, or in the pistils. Irregularity 

 is most frequent in the corolla. 



REVIEW. What is the flower for? What are the two 

 general kinds of organs in the flower? What is the 

 homology of the flower-parts? What 

 are floral envelopes? Calyx? Sepals? 

 Calyx-lobes? Corolla? Petals? Corolla- 

 lobes? Gamosepalous flowers? Gamo- 

 petalous? Polysepalous? Polypetalous? 

 Define torus. What are the essential 

 organs? Stamen? Filament? Anther? 

 Pollen? Pistil? Style? Stigma? Ovary? 

 Carpel? Define a complete flower. In 

 what ways may flowers be incomplete? 



Explain perfect and imperfect (or di- ^^SW^ D?s^ect- 

 clinous) flowers. Define regular flowers. "* needle. 



214. Improvised U natural 



In what ways may flowers be irregular? stand for lens. size. 



