Category: T

Inner seed coat (the outer one is the testa); this term was used by Corner and has been widely taken up. The covering for an organ. A structure that covers an organ or part of an organ. For example the tegmen tympani is the bony roof of the middle ear.  

Classification, ordering into groups according to relationships; plant taxonomy is the science whose practitioners (find), describe, classify, identify and name plants. The science of systematically classifying organisms by emphasizing their relationships at the morphological, anatomical, and molecular levels. In its narrowest sense, the theory and practice of producing a classification by grouping individuals into species,…

A scientist practising classification.  

A general term denoting a named group of any rank (e.g. variety, species or plant kingdom). A category used in classification as for example, a variety, species, genus and family.  

(In nomenclature) a scientific species name in which the specific epithet repeats the generic name, not allowed in botany but allowed in zoology (e.g. Apus apus, the swift).  

Slowly, reluctantly.  

The primary root, going straight down. Strong, sometimes swollen or fleshy root which grows vertically into the soil. A single large, strong root that descends nearly perpendicular into the soil. A stout root with a tapering body. The main root of a plant, which plunges straight down to anchor it; the swollen taproots of carrots…

(In pollen) innermost layer of cells of the pollen sac wall that nourish the developing pollen grains; Membrane in spore-generating area of ferns. A layer of specialized reflecting cells in the choroid behind the retina of the eye. A layer of fibers from the corpus callosum forming the roof and lateral walls of the inferior…