M. WICHURA ON THE WINDING OP LEAVES. 299 



§93. 



Asclepiadece, — Segments of the flower predominantly left in 

 the bud. I have not observed exceptions to this rule myself. 

 But according to Decaisne*, the segments of the flower are 

 wound to the right in the genera Secamone ; Toxocarpus, W. 

 et A. ; Calostigma and Oxypetalum, R. Br. Microloma sagittata, 

 R. Br. : points of the flower-buds twisted to the right. Pergu- 

 laria accidens, Blume; P. edulis, E. M.: buds twisted to the 

 left at the points, the unfolded segments of the flower wound 

 to the left. Diplolepis Menziesii, R. et S. ; Oxypetalum ripa^ 

 rium, H. B. K. : segments of the flower left after the flower 

 opens. Probably the genus Pycnoneuron, Dene., also belongs 

 here, since Decaisne says of it, " Laciniis post anthesin superne 

 dextrorsum contortis," i. e. according to our terminology, to the 



§94. 



Gentianece. — For the winding of the stem-leaves of Chironia 

 see § 46. Segments of the corolla of all the Gentianeae, per- 

 haps with the exception only oiMenyanthes and Villarsia, wound 

 in the bud, and everywhere toward the left. The tubes of the 

 corollas of Gentiana are in addition laid in folds towards the 

 right in the bud. Chironia, Erythroea, Plocandra palustris, 

 Griseb. ; PL Krebsii, Griseb. ; Sabbatia corymbosa, Ell.: de- 

 hiscing anthers to the left. Lisiarithus uliginosa, Griseb. : style 

 left. Sabbatia corymbosa, Griseb. : style right. 



§95. 

 Labiatae, — Burgsdorfia montana, Hort. Bot. Berol.: stem-leaves 

 to the left at the base. Hyssopus lophanthus, L. ; Lophanthus 

 chinensis, Benth. : tube of corollas right. The revolution 

 amounts to about ^, so that the lip of the flower is carried to 

 the upper side. Bentham, in his description of the Labiatae, 

 explains this resupination incorrectly, by a revolution of the 

 flower-stalk {. 



§96. 



Cordiacece, — Cordia Geraschanthus, L. ; C. complicata, Ruiz; 

 C. alliodora, Ruiz : segments of the corolla left in the bud. 



* D.C. Prodromtis, I. c. 501, 504, 580, 581. f Ibid. p. 582. 



J Tom. i. Introduction, p. xxiii. 



