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GLOSSARY OF BOTANICAL TERMS. 



Vexillary. — Applied to that form of imbri- 

 cate aestivation observed in the corolla 

 of the Pea, in which the other petals are 

 enwrapped by the vexillum. 



Vexillum. — The upper and largest of the 

 five petals of a papilionaceous flower. 



Villous, or Villose. — Covered with long, 

 soft, shaggy hairs. 



Violaceous. — Violet colored. 



Virgate. — Straight and slender, like a 

 wand. 



Vitt/e. — The stripes on the fruits of the 

 Umbelliferae. 



Vittate. — Possessing vittae. 



Voluble. — Twining. 



Velum partiale. — A membrane or veil 

 which in some of the Hymenomycetes 

 stretches from the margin of the pileus to 

 the stipe 



Velum universale. — A membrane which 

 in some of the Hymenomycetes covers the 

 entire sporocarp. 



Volva. — A covering possessed by the fruit- 

 ing organs of some fungi. The same as 

 velum universale. 



WATER-PORES. —Organs resembling 

 stomata, but discharging water instead 



of gaseous matter, which occur on some 



leaves. 

 Whorl. — Organs disposed in a circle about 



a central axis are said to be arranged in a 



whorl. 



Wood-cells. — Libriform cells and other 

 elongated, taper-pointed cells, not dis« 

 tinctly marked with pits, spiral or annular 

 markings, found in the wood of plants. 



Wood-parenchyma. — Elongated parenchy- 

 ma cells associated with wood-cells. 



V ANTHOPHYLL. — A yellow coloring 



matter observed in autumn leaves. 

 Xkrophilous. — A term applied to plants 



which, like the Cactuses, are adapted to 



dry regions. 

 Xylem. — That portion of the fibro-vascular 



bundle which contains ducts or tracheids. 



700GAMETE. — A gamete or sexual spore 

 endowed with the power of locomotion. 

 Zoogonidium. — A motile gonidium. 

 Zoosporangium. — A sporangium which 



produces motile spores. 

 Zoospore. — Literally, an animal spore. A 



vegetable spore endowed with the power 



of locomotion, and therefore appearing 



like an animal. 

 Zygomorphous. — Flowers which are divis- 

 ible in only one plane into similar halves 



are called zygomorphous. 

 Zygospore. — A reproductive spore formed 



by the union of the protoplasm of two like 



cells. 

 Zygote. — A term for the product of the 



union of any two reproductive cells or 



gametes. 



