GLOSSARY 417 



Dehis'cence. Splitting open. 



Deliques'cent. Applied to a tree whose trunk or main stem is lost in branches. 



Del'toid. Having the shape of the Greek letter A. 



Den'tate. Having broad acute marginal teeth pointing outward. 



Dentic'ulate. Finely dentate. 



Dermat'ogen. The generative tissue that gives rise to epidermis. 



Deter'minate. Applied to inflorescences on which flowering begins with the 



terminal bud, thus ending the elongation of the stem bearing the flowers. 

 Diadel'phous. Applied to stamens whose filaments are united at their edges 



into two sets. 



Diageot'ropic. Applied to a plant organ that assumes a horizontal position. 

 Dian'drous. Possessing two stamens. 

 Di'astase. A ferment found in germinating seeds and fungal hyphae which 



changes starch into maltose. 



Dichlamyd'eous. Pertaining to flowers that possess both calyx and corolla. 

 Dichog'amy. The maturation of one set of sexual organs before the other. 

 Dichot'omous. Forked. 

 Dic'linous. Pertaining to the stamens and carpels being found in separate 



flowers. 



Dicot'yle'don. A plant whose embryo possesses two seed leaves or cotyledons. 

 Digitate. Referring to a compound leaf whose leaflets come off at the end of 



the petiole. 

 Dimor'phism. Having two forms of flowers, one with long styles and short 



stamens, the other with short styles and long stamens; the occurrence of 



two distinct forms. 

 Dipe'cious. Applied to species having two kinds of individuals, male and 



female. 



Dissect'ed. Cut deeply into numerous divisions. 



Dissep'iment. A partition separating cells in a compound ovary or fruit. 

 Dis'tichous. Pertaining to the arrangement of leaves in two rows. 

 Divi'ded. Segmented to the mid-rib or base. 

 Dorsoven'tral. Having distinct upper and lower surfaces. 

 Dor'sum. The back of an organ. The lower surface of a foliage or floral leaf. 

 Down'y. Covered densely with soft hairs. 

 Drupe. A one-celled, one-seeded fruit whose endocarp is stony. 

 Drupe'let. A small drupe. 



Duct. A tubular element found in the xylem region of a fibro vascular bundle. 

 Dura'men. Heartwood. 



E- or Ex-, A prefix meaning devoid of, outside of, or away from. 



Eccen'tric. Deviating from the center. Applied to the hila of starch grains 



which are outside of the center, also to woody plants which develop more 



rapidly on one side than on the other. 

 Echin'ulate. Beset with small prickles or spines. 

 7 



