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Spile. A small peg or wooden pin. Sometimes synonymous with pile. 



Spine. A sharp woody outgrowth. 



Stamen. The part of a flower which bears the pollen. 



Staminate. Said of flowers which bear only stamens. Sometimes spoken of as male. 



Sterigmata. The projections from twigs bearing leaves. 



Sterile. Barren ; unproductive. 



Stigma. The end of a pistil through which pollination takes place. 



Stipule. A leaf-appendage at the base of the leaf-stalk. 



Stipule-scar. The scar left by the fall of the stipule. 



Stoma. An opening in the epidermis of a leaf communicating with the internal air cavities. 



Striote. Marked with fine elongated ridges or lines. 



Striations. Long narrow lines or ridges. 



Strobile, A fruit marked by overlapping scales as in the Pine, Birches, etc. 



Style. The pin-like portion of the pistil bearing the stigma. 



Sub-. A prefix meaning under or nearly. 



Sucker. A shoot arising from an underground bud. 



Superposed. Said of buds when they are arranged one above the other. 



Symmetrical. Regular as to the number of parts. Having the same number of parts in each 



circle. 



Terminal. Pertaining to buds located at the end of twigs. 

 Thorn. A stiff, woody, sharp-pointed projection. 



Tolerant. Applied to trees which endure certain factors, particularly shade. 

 Tomentum. A dense layer of hairs. 

 Tomentose. Densely pubescent; hairy. 

 Truncate. Ending abruptly, as if cut off at the end. 

 Tubercle, A small tuber or tuber-like body. 

 Tufted. Growing in clusters. 



Umbel. A flower-cluster with all the pedicels arising from the same point. 

 Unisexual. Consisting of one sex only, either staminate or pistillate. 

 Valvate. Said of buds in which the scales merely meet without overlapping. 

 Vegetative. Said of buds which do not contain reproductive organs. 

 Veins. Threads of fibro-vascular tissue in leaves or other organs. 

 Versatile. Used for many purposes. 

 Viscid, Glutinous ; sticky. 

 Whorl. A group of three or more similar organs, as leaves or buds, arranged about the same 



place of attachment. 

 Whorled. Borne in a whorj. 

 Xylology. The science which treats of the form and structure of wood. 



