Glossary [381] 



Umbo. A boss or protuberance. 



Undulate. With wavy surface or margin. 



Unisexual. Of one sex, either staminate or pistillate. 



Valvate. Leaf buds meeting at the edges, not overlapping. 



Valve. One of the pieces into which a capsule splits. 



Veins. Threads of fibro-vascular tissue in a leaf or other fiat 



organ. 

 Ventral. Belonging to the anterior or inner face of an organ; 



the upper surface of a leaf. 

 Vernal. Appearing in the spring. 

 Vesicle. A little bladder or cavity. 

 Villose. Hairy with long and soft hairs. 



Whorled. Three or more organs arranged in a circle round an 



axis. 

 Wing. A membranous or thin and dry expansion or appendage 



of an organ. 

 Woolly. Covered with long and matted or tangled hairs. 



