34 STRUCTURAL BOTANY. 



98. Calyx inferior or free, ovary superior or free, are all 

 phrases of the same import as calyx hypogynous. Between the 

 two conditions, calyx superior and calyx inferior, there are nu- 

 merous gradations, of which one only is defined, to wit, calyx half- 

 superior, as exemplified in the Mock-orange and Saxifrage (53). 



Review. 87. The type once more. State the only true distinction between calyx and 

 corolla. 88. What part in the floral leaves corresponds to blade ? What part to petiole ? 

 General forms. 89. Several peculiar forms mentioned. 90. Why should the floral organs 

 be united ? What absurdity in the word monosepcdoiis. etc. ? The opposite terms. 

 91. What the tube? the limb? 92. Varieties in the decree of cohesion (figs. 45-48). 

 93. How in Grape, etc.? 94. Define adherent. 95. Use of the word hypogynous? 96. 

 Perigynous? 97. Epigynousf Two equivalent phrases. 98. Calyx half-superior. Ex- 

 plain figs. 49-54. 



CHAPTER VI. 



FORMS OF THE PERIANTH. 



99. The innumerable forms of the perianth, whether calyx or 

 corolla, or both, are first to be distinguished as POLYPETALOUS 

 or GAMOPETALOUS, and secondly, as regular or irregular. The 

 pOLYPETALOUS-ra/wto forms may be referred to the four types 

 represented in the drawings below, and described as follows. 



Form* of corollas. -55, Cheiranthns (Stock). 56, Silene regia (Scarlet Catchfly). 57, Pyrus coronanr 

 58, Amaryllis (Atamasco Lily). 



100. First, Cruciform (crucis, of a cross) or cross-shaped 

 corollas consist of four long-clawed petals, placed at right angles 

 to each other, as in Mustard, Wall-flower (55). 2d, Caryophyl 



