43 8 PHARMACEUTICAL BOTANY 



Te'trarch. Said of a radial fibrovascular bundle having 4 xylem and 4 phloem 

 arms alternating with one another. 



Tet'raspores. Applied tp the asexually produced spores of the Floridea group 

 of Red Algae on account of being formed in groups of four'in the mother cell. 



Tetras'tichous. Said of leaves when they are arranged in four vertical rows 

 upon a stem. 



ThaTamus. Another name for receptacle. 



Thal'lus. A plant body showing no differentiation into root, stem, or leaf. 



Thermotropism. Response of living matter to the stimulus of heat or cold. 



Thorn. See Spine. 



Throat. The opening into the tube of a gamosepalous cal>x or gamopetalous 

 corolla. 



Thyr'sus. A compact panicle of flowers like the Lilac or Sumac. 



Tis'sue. An aggregation of cells of similar source, structure and function in 

 intimate union. ' 



To'mentose. Covered with dense, matted, wooly hairs. 



Tor'tuous. Bent or twisted irregularly. 



To'rus. Another name for receptacle. 



Tra'chea. An elongated cylindrical or prismatic tube found in the fibrovascular 

 system 'and serving for the conduction of crude sap. 



Tra'cheid. An undeveloped trachea usually with bordered pits. 



Transpira'tion. The giving off of watery vapor by the plant. 



Tri. Three. 



Triadel'phous. Having the filaments in 3 sets. 



Trian'drous. Possessing three stamens. 



Tri'arch. Applied to a radial fibrovascular bundle having three xylem and three 

 phloem arms alternating with one another. % 



Tricar'pellary. Possessing three carpels. 



Trich'oblast. An internal hair, like those projecting into the intercellular-air- 

 spaces of the stems of certain Water Lilies. 



Trich'cgyne. A slender appendage to the carpogonium. 



Trich'ome. A plant hair. 



Trichot'omous. Three-branched or forked. 



Trifo'liate. Said of a compound leaf having three leaflets. 



Trimor'phous. Possessing three kinds of hermaphrodite flowers in the same 

 species, differing in the relative length of their stamens and carpels. 



Tristichous. Three ranked. 



Triter'nate. Applied to a compound leaf whose petiole divides into three second- 

 ary petioles, each of which again divides into three tertiary petioles, each 

 division bearing 3 leaflets. 



Trun'cate. Ending abruptly as if cut off or flattened at the summit. 



Tu'ber. A short excessively thickened end of an underground stem. 



Tu'bercle. A small wart-like outgrowth upon the rootlets, roots or subter- 

 ranean stems of various plants. 



