HISTORY AND BIBLIOGRAPHY 871 



Stigma. That part of the pistil which receives the pollen. 



Stipules. Leaf-like appendages arranged in a pair at the base 

 of the leaf stalk. 



Stolon, or stole. A trailing or reclining and rooting shoot. 



Stoma. Opening into the epidermis by which air enters and 

 moisture escapes. 



Striate. Marked with parallel lines or ridges. 



Style. The slender part of a pistil supporting the stigma. 



Sub-. A prefix meaning somewhat or slightly. 



Succulent. Juicy, fleshy. 



Suspensor. Filament of cells in ovary. 



Tapetal Cells. Cells surrounding mother cells in pollen and con- 

 taining food material. 



Terete. Long and round. 



Terminal. Attached to or pertaining to the extremity or apex, 

 as the terminal bud. 



Testa. Outer seed coat. Sometimes both coats are spoken of as 

 the testa. 



Tomentose. Densely pubescent with matted wool. 



Tomentum. Matted, woolly hairs. 



Toothed. See Dentate. 



Trailing. Prostrate on the ground but not rooting. 



Transpiration. Process by which leaves lose moisture. 



Trichome. A plant hair of any kind. 



Truncate. Ending abruptly as if cut off transversely. 



Tuber. A short thickened subterranean branch. 



Turbinate. Top-shaped. 



Turgid. Thickened like a tuber, or distended with a liquid (never 

 with air) . 



Umbel. Any indeterminate inflorescence in which the peduncles 

 or pedicels of a cluster seem to rise from the same point. 



Umbellate. Like an umbel. 



Undulate. Having a wavy surface. 



Urtieating. Stinging. A term applied especially to the plant 

 hairs of members of the Urticaceae, some of which are poisonous. 



Utricle. A small inflated membranous 1-seeded fruit. 



Valve. 1. One of the parts of a dehiscent fruit. 2. Applied 

 also to the top of a pitcher in the Sarracenia. 



Vein. A bundle of threads of fibro-vascular tissue in a leaf or 

 other organ. 



VerticiUate. Whorled. 



Villous. Bearing long, soft, straight hairs. 



