GLOSSARY 739 
TricH’omMe.—A plant hair. © 
TricHor’omous.—Three-branched or forked. 
Triro’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. 
Tris’tr1cHous.—Three ranked. 
TRITER’/NATE.—Applied to a compound leaf whose petiole divides into three sec- 
ondary 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 subterranean 
stems of various plants. 
Tu’BEROUs.—Bearing or resembling tubers. 
Tu’NnIcATED.—Covered with successively overlapping coats as the bulb of an Onion. 
_Tur’BINATE.—Top-shaped. 
TurRGEs’cENT.—Swelling. 
Ty1o’sts.—A protrusion of the wall of a cell through the pit in the wall of an 
adjacent vessel and appearing in the cavity of the latter. 
Typre.—An individual possessing the essential characteristics of the group to which 
it belongs. : 
Um’seL.—The typical inflorescence of the family Umbellifere. A more or less flat- 
topped indeterminate inflorescence in which the pedicels spread like the stays of 
an umbrella. 
Un’ cirrormM.—Hook-shaped. 
Un’‘prersHrus.—A low shrub-like plant whose base is woody and upper portion 
herbaceous. 
Un’puLaTE. —Having a wavy margin. 
Un1.—A prefix of Latin origin meaning one. 
UntLat’ERAL.—One-sided. 
Uniioc’uLAr.—One-celled. 
Unisr/RIATE.—Arranged in a single row, as the cells of some plant hairs. 
Ur’/ceoLATE.—Urn-shaped. 
Ure’pospore.—A one-celled spore produced during the life history of a Rust. 
U’tricte.—An akene with a bladdery pericarp or calyx as Chenopodium fruit. 
Vac’voLe.—A cavity within the protoplasm of a cell usually containing cell sap. 
VALv’ATE.—Applied to the leaves of a flower in the bud stage when their margins 
meet but do not overlap. 
Va.ve.—One of the halves of a diatom. One of the parts of a pericarp that splits 
open when ripe. ae 
VartA’tTION.—The occurrence of differences among the individuals of a species or 
variety. 
Vari'Ety.—A group of individu 
from the rest of the species. 
Vas’cuLAR Bun’pLe.—A group of tubular cells frequently combined with fibers 
or other kinds of cells coursing through the plant and serving primarily 
uction and secondarily for mechanical support, storage, etc. 
als within a species that differ in some minor respect 
for cond 
