GLOSSARY. 383 



Herbaceous. Not woody; said of plants that die to the ground 



each year. 

 Horticulture. The art and science of raising fruits, kitchen 



garden vegetables, flowers and ornamental trees and 



shrubs. 



Humus. Decomposed organic matter in the soil. 

 Hybrid. Plant derived from a cross between plants of different 



species. 

 Hybridising. The operation or practice of crossing between 



species. 

 'Hypogynous. Said of flowers when all parts are free. (e. g. 



Buckeye). 



Hypsometer. An instrument for taking heights of trees. 

 Imbricated. Overlapped. 

 Inarching. The operation and process of uniting contiguous 



plants or branches while the parts are both attached to 



their own roots. (Page 90.) 



Indehiscent. Not opening at regular lines; not dehiscent. 

 Indigenous. Native, i. e. growing naturally in a given region. 

 Inferior. Said of ovary when all the floral parts are attached 



above it. (e. g. Iowa Crab.) 



Inflorescence. A flower cluster; mode of arrangement of flowers. 

 Insecticide. A substance employed to destroy insects. 

 Involucre. A bract or series of bracts subtending a flower-cluster 



or fruit-cluster. 

 Irregular. Said of flowers when the separate parts of each cycle 



are not of the same size and shape, (e. g. Locust.) 

 Jacob staff. A pointed staff which may be pushed into the 



ground and on which instruments are mounted for taking 



observations. 



Joinery. The art of framing the finishing work, making perma- 

 nent wooden fittings and covering rough lumber. 

 Kerf. The cut made by the saw, or the width of such cut. 

 Lanceolate. Said of leaves when from four to six times as long as 



broad, the broadest part below the middle and tapering 



upward or both upward and downward, (e. g. Black 



Willow.) 



Larva, (pi. larvae) The worm-like stage of insects. 

 Layer. A shoot which, while attached to the plant, takes root 



at one or more places and forms a new plant. (Page 89.) 



