60 NOMENCLATURE. 



wise are separated, running togetlier in Xanthium hamotha- 

 lamum ; and the attempt at this separation in Flaveria and 

 Brotera, as also in Calycera, Cav. is very distinctly marked. 



86. 



Bractea are those leafy parts which appear in the neigh- 

 bourhood of the flowers, and which have either a different 

 form or a different colour from the other leaves ; (Tab. VI. 

 Fig. 6.) But when they cannot be distinguished from the 

 other leaves either by the form or colour, they are called, 

 from their station, foral leaves (Jhlia Jloralia). In the Ane- 

 mone, the leaves which stand immediately under the blossom, 

 liave been called involucres (hivolucra), although they are 

 only foUa Jloralia. 



When the bracteae are collected together above the flowers, 

 and contain either abortive blossoms or none, they form the 

 tuft (coma). There is another sense of this word noticed 

 (2.5.) 



Besides the bracteae, there is another remarkable part in 

 Surubea? Aubl. (Tab. V. Fig. 11.), where a club-shaped, 

 coloured, and forked body sits horizontally on the flower- 

 stalk, and as it were rides on it. It has been lately called an- 

 thoxorynium. In Ruyschia clusiaefolia, Jacq. Amer. Tab. li. 

 Fig. 2, there is a similar form, but not cleft. 



87. 



The spathc (spatha), is formed by one or more bracteae-, 

 which enclose the flowers of the Coronariae, Iridefe, and other 

 related plants, and which are either leafy or membranaceous. 

 The individual bracteae which compose the spathc, have 

 been very improperly called valves (valva). 



Covers of flowers, which stand at a distance from them, arc 

 called generally perianthia. 



To this class belongs, in particular, the involucrum which 

 occurs in umbelliferous plants. 



If the inflorescence of compound flowers be regarded as 

 one bimch of flowers, the common cover receives the muue of 



