■304 M. WICHURA ON THE WINDING OF LEAVES. 



§117. 



Sterculiacece, — For Helicteres, and its contorted aestivation, 

 see § 16. Helicteres guazumcefolitty H. et B. : fruits of the two- 

 flowered cymes probably wound towards opposite sides on ac- 

 count of the antidromy of their leaf-spirals. I have only been 

 able to examine the fruits of this one species, but think the rest 

 would exhibit a similar character. 



§118. 



Xanthoxylece. — Ailanthus glandulosus, Desf. : fruits wound to 

 the right (fig. 3) at the tips. 



§119. 

 Oxalide(B. — Besides the winding of the petals in the bud, 

 already mentioned, I observed a very distinct and constant 

 winding of the stem-leaves to the right, in a species of Oralis 

 which was cultivated in 1848, in Decker^s Nurseries at Berlin, 

 under the doubtful name of Oralis palmata. 



§ 120. 



Onagrarieae. — {(Enotherece) : segments of the corolla left in 

 the bud. Lopezia : the upper part of the solitary existing sta- 

 men to the right. 



§121. 



Combretaceae. — Combretum purpureum, Vahl : petals in the 

 bud left. 



§122. 



PhiladelphecB, — Philadelphus coronariusy L. ; P. Gordonianus, 

 Lindl. : petals in the bud right. Philadelphus hirmtus : petals 

 in the bud left. 



§123. 



Melasto7nace(B, — Petals in the bud left, probably in all the 

 Melastomaceae. For the winding of the sepals and anthers in 

 Arthrostemma Humboldtii, see § 47. 



§124. 



MyrtacecB, — Callistemon and Metrosideros : stalks of the stem- 

 leaves about \ towards the left. For the winding of the stem- 

 leaves of Eucalyptus and Melaleuca, see §§45 and 46. 



