AND ITS DIFFERENT KINDS, 10§ 



species of TrifoUum^ either annuals, as 

 glomeratum^ f. lOGS, or perennials, as 

 fragifenim, t, IOjO. — The knobs ia 

 these instances are only of annual dura- 

 tion ; in the Pcconia, Pseonv, t. 1513, and 

 Spiraa FiUptfidula, Dropwort, 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, f. 10, 

 as in Satyrium Inrcinum, EngL Bof, f. 34, 

 Ophrys arajiifera, t, 65, and apifcra, 

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

 somewhat like the human hand, /*. 11, as in 

 Orchis moculata, t. 6o2. 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 Ophrys 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 

 r-oot oi Satyrium alhidum, t. 505, consists 



