M. WICHUBA ON THE WINDING OF LEAVES. 29? 



L. ; C. Loreyi, Pollin. ; C. Medium, L. : dehiscing anthers left. 

 The species in which the anthers wind to the same side, exhibit 

 a certain agreement in their habit, which indicated that the two 

 groups which are distinguished from each other by the opposite 

 winding of their anthers may also be separated by other cha- 

 racters. But this requires a more exact knowledge of this 

 large genus than I possess. 



88. 



Stylidea. A slight revolution of the corolla brings the anterior, 

 odd petal into a lateral position. I have only examined one 

 species of this genus, which was cultivated in the Berlin Garden 

 under the name of Stylidium suffruticosum. In this the winding 

 of the corollas was without exception directed to the left. 



89. 



Rubiacea. Pavetta indica, L. ; P. Caffra, Thunb. ; P. lan- 

 ceolata, Ecklon ; P. manitensis, Walpers ; P. longissima, Kl. ; 

 Ixora Bondhuca, Rxbrg. ; /. acuminata, Rxbrg. ; /. parviflora, 

 Vahl ; /. nigricans, R. Br. ; Wendlandia coriacea, Vahl ; Augusta 

 lanceolata^ Pohl, Randiaferox, D.C.; Gardenia latifolia, Rxbrg.: 

 segments of the flowers right on the contorted aestivation. Exo- 

 stemma maynense, Pcepp. : segments of the flower left in the bud. 

 Coffea arabica, L. ; Gardenia latifolia, Rxbrg. : dehiscing anthers 

 right. Pavetta (the above-mentioned species) : dehiscing anthers 

 left. The anthers of Gardenia latifolia, Rxbrg., and Pavetta, con- 

 sequently follow opposite directions in their winding, while the 

 segments of the flowers of both are turned in the same direction. 



90. 



Jasminece. Jasminum officinale, L. : segments of the flower 

 left, in the contorted aestivation, which however not unfrequently 

 passes over into the imbricated aestivation. Jasminum hirsutum, 

 Hoffmsgg. : segments of the flower predominantly right, in the 

 contorted aestivation. 



91- 



Oleacecs. Fraxinus heterophylla, Vahl: fruit slightly right 

 during the ripening. 



92. 

 ApocynacecK. Segments of the flower wound in the bud, in 



