6€i. 



GLOSSARY 



Shoot, the stem and its appendages. 



Sieve plate, the perforated area of a 

 sieve tube. 



Sieve tube, an element of the phloem 

 with lateral or terminal sieve plates. 



SiLiQUE, the dry, many-seeded, dehis- 

 cent (infrequently indehiscent) fruit 

 of the Cruciferae, consisting of two 

 carpels which form a bilocular ovary 

 with a longitudinal septum. 



SiPHONOSTELE, a vascular cylinder sur- 

 rounding a central pith. 



Spathe, a large bract or bracts enclosing 

 an inflorescence. 



Spatulate, oblong with the basal end 

 attenuated. 



Spike, a racemose inflorescence with 

 sessile flowers on an elongated axis. 



Spikelet, a secondary spike; the unit 

 of the inflorescence in grasses. 



Spongy tissue, parenchyma with many 

 intercellular spaces. 



Sporophyll, a spore-bearing leaf. Cf. 

 Mega- and Microsporophyll. 



Stamen, a pollen-bearing organ; a 

 microsporophyll . 



Staminodium, an abortive, sterile, or 

 rudimentary stamen. 



Standard, the large upper petal of a 

 papilionaceous corolla. 



Stele, the vascular cylinder of an axis; 

 the central cylinder. 



Stigma, the receptive portion of the 

 pistil. 



Stipule, an appendage at the base of the 

 petiole. 



Stolon, a runner or prostrate stem that 

 tends to root. 



Stoma (pi. stomata), an opening in the 

 epidermis leading to an intercellular 

 space. 



Stomium, an opening in an anther be- 

 tween lip-like cells through which 

 dehiscence occurs. 



Stone cell, an approximately isodia- 

 metric sclerenchymatous cell. 



Strict, straight, upright. 



Style, the usually elongated portion 

 of the pistil connecting the stigma 

 and ovary. 



Stylopodium, a disk-like enlargement 

 at the base of the style. 



Superior, (of ovary) free from the other 

 floral parts which are hypogynous. 



Suspensor, (of embryo) the part of the 

 proembryo at whose apex the embryo 

 proper develops. 



Suture, a seam or line of union; fre- 

 quently a line of dehiscence in fruits. 



Sympetalous, see Gamopetalous . 



Sympodial, (of stem) made up of a 

 series of superposed branches so that 

 it resembles' a simple axis. 



Syncarpous, of undiverged or "united" 

 carpels. 



Synergid, the nuclei or cells adjacent 

 to the megagamete at the micropylar 

 end of the megagametophyte. 



Tapetum, the layer or layers of cells 

 adjacent to the sporogenous tissue 

 in the micro- and megasporangium. 



Terete, circular in transection; cylin- 

 drical and usually tapering. 



Testa, the seed coat. 



Tetracyclic, (of flower) applied to one 

 with four whorls of floral parts. 



Tetrarch, (of root) a stele with four 

 protoxylem groups. 



Tissue, a group of cells of common 

 origin having essentially the same 

 structure and performing the same 

 functions. 



Torus, the receptacle of a flower. 



Trachea, a xylem element consisting of 

 a linear series of cells which form a 

 continuous tube owing to the dis- 

 integration of their end walls; a 

 vessel. 



Tracheid, an elongated, water-con- 

 ducting xylem cell with variously 

 thickened and pitted walls. 



Triarch, (of root) a stele with three 

 protoxylem groups. 



