AND ITS DIFFERENT KINDS. 85 



that it is not perfected till the autumn immediately 

 preceding its flowering, and the plant seems to have 

 but one bulb. Ophrys Nidus avis, t. 48, has clus- 

 ters of cylindrical knobs, which are formed, and also 

 wither away, in parcels, each parcel being equiva- 

 lent to one of the above-mentioned bulbs. 



Such of the Orchis tribe as have biennial bulbs 

 are supposed to be very difficult of cultivation ; but 

 according to the experience of my excellent friend 

 the late Mr. Crowe, in whose garden I have seen 

 them many successive years, they are best removed 

 when in full flower, the earth being cleared corn- 

 pletely away from the roots, which are then to be 

 replanted in their natural soil previously dried and 

 sifted. Afterwards they must be well watered. The 

 bulb for the following year has not, at the flowering 

 period, begun ttf throw out its fibres ; for after that 

 happens, it will not bear removal. Satyrium albidum 

 having, as mentioned above, so many pair of roots, 

 the growth of some of which is always going on, 

 has hitherto not been found to survive transplanta- 

 tion at all. 



Iris tuberosa, Sm. Fl. Grcec. Sibth. t. 41, has a 

 root very analogous to these just described, but 

 I.florentina and J. germanica, t. 39 and 40 of the 

 same work, have more properly creeping roots, 

 though so thick and fleshy in their substance, and 

 so slow in their progress, that they are generally 

 denominated tuberous. 



