56 



THE PERIGONE 



107) when, either with or without any manifest curve, its axis is turned 

 from the perpendicuhir, so that it rests more or less against one side of 

 the cal^-x. It may be Straight or Curved, and the curvature may be 

 Simple (Fig. 99) or Compound as in the Sigmoid calyx of Aristolochia 

 (Fig. 106). When dilated upon one side only it is Ventricose, as in 

 some species of Salvia (Fig. Ill), or, if the swelling is small and prom- 

 inent, Gibbous (Fig. 107, a). When the swelling is carried downward, 

 so as to form a sac, as in Cypripediuvi (Fig. 112, a) it is called Saccate. 

 When the dilation is directed upward, so as to form a hood, as in Aconite 

 (Fig. 108, a), it is called Cucullate or Galeate, and when the hood is 



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Fig. 105. One-lipped corolla of Dinoseris. 106. Sigmoid-curved calyx of Aristolochia. 107. Corolla 

 of Achimenes, the mouth oblique, the base declined and gibbous. 108. Galeate upper petal of Aconite. 

 109. Personate corolla of C/ieZone. 110. Papilionaceous corolla of La^^2/r«s. 111. Ringent and gibbous 

 corolla of Salvia. 112. A saccate lower petal of Cyprip^dium. 113. Auricled calyx of Nicandra. 

 114. Dorsal spur on petal of Myrmephytum. 115. Long-caudate petals of Theobroma. 



compressed laterally and much enlarged proportionately to the size of 

 the body it is called Cristate. Most of these terms are also applicable 

 to a single lip of the form next to be considered or to a petal. When 

 one or more of the lobes of a corolla are separated by a deeper sinus 

 than those of the others it is called Labiate or Lipped. If the fissure 

 proceeds entirely across the corolla, cutting off the lower portion, it 

 becomes One-lipped (Fig. 105). Otherwise it is Bilabiate or Two-lipped 

 (Fig. 111). The two lips are denominated respectively the Upper or 

 Inner (a), being that which is nearer the stem of the plant when the 

 flower and its stem are standing erect and without any twisting, and 



