326 HETEROMOEPHY. 



Veget., t. i, p. 155, tab. xxxvi, Mentha, &c. Alph. de Candolle, ' Neue 

 Denkschr. AUg. Schweiz. Gesellschft.,' band v, tab. vi, Valeriana. Du- 

 cbartre, 'Ann. Sc. Nat.,' ser. 3, vol. i, p. 292. ' Gai-deners' Chronicle,' 

 July 5, 1856, p. 452, c. ic. teylogi:, spiral branches from Guatemala 

 tree not known. 



Spiral twisting of the leaf is scarcely of so common oc- 

 currence as the corresponding condition in the stem. 

 In Alstrcemeria it occurs normally, as also in some 

 grasses. In the variety annularis of Salix bahylonica 

 the leaf is constantly coiled round spirally. A similar 

 contortion occurs in a variety of Codiceum variegatum 

 lately introduced from the islands of the South Seas 

 by Mr. J. G. Veitch. 



Fern fronds are occasionally found twisted in the 

 same manner, e. g. Scolopendrium vulgare var. spirale} 



Adventitious tendrils. Under ordinary circumstances 

 tendrils may be described as modifications of the leaf, 

 the stipule, the branch, or of the flower stalk, so that 

 it is not a matter of surprise to find tendrils occasion- 

 ally springing from the sepals or petals, as indeed 

 happens normally in Hodgsonla, StrophanthuSj &c. 



M. Decaisne^ found a flower of the melon in which 

 one of the segments of the calyx was prolonged into 

 a tendril, and Kirschleger records a similar instance in 

 the cucumber, while Mr. Holland (' Science Gossip,' 

 1865, p. 105) mentions a case in which one of the 

 prickles on the fruit of a cucumber had grown out into 

 a tendril. 



In Cobcea scandens the foliar nature of the tendril is 

 shown by the occasional presence of a small leaflet on 

 one of the branches of the tendril, and a similar 

 appearance may frequently be seen in Eccremocarpus 

 scaler. On the other hand, in the vine, the axial nature 

 of the tendril is revealed by the not infrequent presence 

 of flowers or berries on them, as also in Modecca and 

 some Passifloracece. 



' Moore, ' Nature-printed Ferns,' 8vo edition, vol. ii, p. 183. 

 " Bull. Soc. Bot. Fr.,' 1860, vol. vii, p. 461. See also Naudin, ' Ann. 

 Sc. Nat.,' 4 ser., t. iv, p. 6. Clos, ' Bull. Soc. Bot. Fr.,' t, iii, p. 546. 



