LEUCHTENBERGIA. 99 



developed and rooted by October. When sick, the plant should 

 be carefully washed, all decayed parts cut away, and then planted 

 in sandy loam and kept in a stove temperature. 



Ii. principis. 



This, the only species known, was introduced from Mexico to 

 Kew in 1847, where it flowered the following year. The plant 

 attains a height of 1 foot or more, with a head of leaf-like tubercles 

 from 3 to inches long, grey-green in colour, succulent, with a 

 tough skin, triangular, and gradually narrowed to a blunt point, 

 upon which are half a dozen or more thin, flexuous, hornv filaments, 

 the central one 5 inches long, and the others about half that length. 

 The flowers are borne on the ends of young, partly -developed 

 tubercles, near the centre of the head ; they are erect, tubular, 3 to 

 4 inches long, scaly, the numerous sepals and petals forming a 

 flower of the ordinary Cactus type, 4 inches across, and of a rich 

 yellow colour. The anthers form a column in the centre, through 

 which the nine-rayed stigma protiudes. Strong plants sometimes 

 produce two flowers together. 



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