10 



The tiansition from green to yellow may be traced in all 

 stages. A short list only is added of native plants : Pro- 

 sarles. Uvular ia, Dioscorea, Agave, MedeoJa, Sassafras, 

 Clmlonia, Physalis, Nicotiana, Frasera, Sedum, Penthormn, 

 Gonolobus, Shepherdia, Trollins, Myosurus, Liriodendron, 

 etc. 



The leaves of many healthy plants turn from green to 

 yellow, as seen in numerous garden shrubs and vines which 

 are wholly yellow or variegated in various ways, as a green 

 leaf with a yellow margin. Fruits turn from green to 

 yellow, as the banana, lemon, etc. 



Autumn leaves are also largely yellow, and most flowers 

 of a yellow color are preceded by green, as in JVup/tar, 

 Hyjwxis, Narcissus, lilies, etc., but there appears to be a 

 yellow of a different quality not derived from green, as 

 seen in roots, bulbs, early shoots, and when a white flower, 

 as Lonicera Jongifora, changes to a clear yellow. 



GREEN, YELLOW AND BROWN. 



We have already alluded to the brown and brown-purples 

 of some of our native plants ; but among tropical plants, 

 and especially the orchids, one is surprised at the number 

 of flowers having these colors. Very often the brown is 

 associate<l with yellow ; at times the flowers appear to have 

 yellow as the ground color, and to be merely blotched or 

 barred with brown, while in other species the flowers may 

 be wholly brown or brown with yellow markings. A few 

 descriptions will illustrate these combinations of color : 



Ejndendrum oncidivides, red-brown marked with 3'ellow. 



E. ocltraceum, orange-brown, lip yellow. 



Phalmnopsis Luddemannia, chestnut-brown, with pale 

 yellow transverse streaks. 



Oncidmm. Baiemanianmn, light yellow, blotched with 

 chestnut-brown. 



O. Baneri, yellowish-green, spotted with red-brown. 



O. harJ)atmn, yellow, blotched with chestnut-l)rown. 



