34 STRUCTURAL BOTANY. 



1)8. 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 onl^ 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, as. 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 monosepalous. etc. ? The opposite terras. 

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

 93. How in Grape, etc. ? 94. Define adherent. 95. Use of the word hypogyncus / 9('>. 

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

 plain figs. 49-54. 



CHAPTER VI. 



FOHMS 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-m/wfor forms may be referred to the four types 

 represented in the drawings below, and described as follows. 



Form* of corollas. 55, Cheiranthus (Stock). 56, Silene regia (Scarlet Catchfly). 57, Pyrus coromuir. 

 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, 



