OR APPENDAGES OF PLANTS. l69 



pale floral leaf, attached to the flower-stalk. The 

 Lavenders,/! 118, see Curt. Afag. if. 400 and 401, 

 have coloured brae teas, and the Purple-topped Clary, 

 Salvia HormiJiumy Fl. Grcec. t, 20, exhibits a gra- 

 dation from the proper leaves to green brae teas, and 

 from them to coloured oneS; which last are barren, 

 or unaccompanied by flowers. Hence I am induced 

 to believe this plant a mere variety of S. viridis, 

 t. 19 1 all whose bracteas are green and fertile. 

 Bartsia alp'ma^ Engl. Bot. t. 361, and Melam- 

 pyrum arvense, t. 53, display an elegant transition 

 from leaves to coloured bracteas. The Orchis tribe 

 have green leafy bracteas, different in size in diffe- 

 rent species. A most beautiful large and coloured 

 bractea is produced in Musscenda frondosa^ Hort, 

 Mai. V. 2. t. 18, from one of the teeth of the calyx, 

 also in M. glabra of Willdenow, and two new 

 species brought from America by Mr. John Fraser. 

 Spinous bracteas of a curious construction guard the 

 C3\yx in At ractjf lis cancellata J J'. 119. Linnteus ob- 

 serves that no bracteas are to be found in the class 

 Tetradynamia, 



The ocrea of Rottboll, fVilldenoxvs Principles 

 of Botany, 50, which enfolds the flower-stalks in 

 Cyperus, see Engl. Bot, t. 1 309, seems to me a 

 species of bractea. 



3. Spina,/. 120. A Thorn. This proceeds from the 

 wood itself, and is either terminal like Hippophae 



