AND ITS DIFFERENT KINDS. 109 



species of Trifolium, either annuals, as 

 glomeratum, t. 1063, or perennials, as 

 fragiferutn, t. 1050. — The knobs in 

 these instances are only of annual dura- 

 tion; in the Paeonia, Paeony, t . 1513, and 

 Spircea Filipendula, Drop wort, t. 284, 

 they are perennial. — In the Orchidece of 

 Europe they are mostly biennial. The 

 ^root in many of the latter consists either 

 of a pair of globular or oval bodies, as 

 in Satyr aim hircinum, Engl. Bot. t. 34, 

 Oplmjs aranifera, t. 65, and apifera, 

 t. 383 ; or are palmate, that is, shaped 

 somewhat like the human hand, as in 

 Orchis maculata, t. 632. Of these glo- 

 bular or palmate knobs or bulbs one pro- 

 duces the herb and flowers of the present 

 year, withering away towards autumn, 

 ♦and the other is reserved for the following 

 season, while in the mean time a third is 

 produced to succeed the latter. The knobs 

 of Ophri/s spiralis, t 541, are formed 

 three or four years before they flower, and 

 their flowering appears to be occasion- 

 ally deferred to a more distant period. The 

 root of Satyrium albidum, t. 505, consists 



