570 GLOSSARY 
Stigma. That part of the pistil through which pollen grains penetrate 
and effect fertilization. 
Stipe. The stalk-like support of a pistil; the leafstalk of a fern. 
Stipule. An appendage at the base of a leafstalk or on each side of 
its insertion. 
Stolon. A runner, or any basal branch which takes root at the nodes. 
Striate. Marked with lengthwise lines or ridges. 
Style. The (usually) slender and elongated part of a pistil connecting 
the ovary and stigma. 
Succulent. Juicy and fleshy. 
Suture. The line of splitting or opening of a dehiscent fruit. 
Ternate. Arranged in threes. 
Tendril. Very slender, coiling organs by which some climbing plants 
cling to a support. 
Tomentose. Densely covered with wool-like hairs. 
Truncate. Ending abruptly as if cut off squarely. 
Tuber. A short, thickened, underground branch having numerous 
buds or “ eyes.” 
Umbel. A flower cluster having all the pedicels arising from the same 
point. 
Unisexual. Bearing staminate and pistillate flowers on different 
plants. 
Utricle. The bladder-like covering of a one-seeded fruit. 
Valve. One of the divisions into which a capsule splits. 
Vein. Branching threads of fibrous tissue in leaves and other organs. 
Viscid. Glutinous or sticky. 
Whorl. Arranged in a circle around a stem. 
