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An alphabetical listing of General terms and items. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Deciduous   Pertaining to plants which shed their herbaceous tissues after one year's growth; not evergreen; caducous. Decompound   Divided or compound more than once. Decumbent   Trailing along the ground but with the inflorescence or summit of the stem ascending or erect. Decurrent   Usually pertaining to some flat, foliar organ, the tissue of which continues beyond its base down an elongate axis (usually a stem or petiole). Decussate   Opposite leaves in four rows up and down the stem; alternating in pairs at right angles. Deflexed   Abruptly directed downward; reflexed. Dehiscence   The opening of a fruit or anther by sutures, valves, slits, pores, etc. Dehiscent   Said of a fruit or anther that opens by sutures, valves, slits, pores, etc. Deltoid   Triangular. Dentate   Toothed, the teeth perpendicular to the margin. Denticulate   Minutely dentate. Depauperate   Poor; with little sustenance or vigor. Determinate   Inflorescence whose terminal flowers open first. See indeterminate. Diadelphous   Combined into two, often unequal sets; primarily spoken of in connection with the Fabaceae family, where the flowers typically have a set of stamens consisting of nine and another consisting of only one stamen. Diaphragm   A dividing membrane or partition, a feature of chambered pith. Dichasium   A cyme with two lateral axes. Dichotomous   Forking regularly in two directions. Dicot   Angiosperm with 2 seed leaves. Diffuse   Widely or loosely spreading. Digitate   Typically referring to a compound leaf in which the leaflets originate from a common point at the apex of a petiole; also spoken of a flower cluster. Back to top Digitate Leaf   Leaflets radiating from the leaf-stalk. Dilated   Expanded or enlarged. Dimorphic   Having two forms. Dioecious   Pertaining to plants, individuals of which bear either staminate or pistillate flowers but not both. Disarticulate   To separate. Disc   The central part of a radiate flower in which the florets are tubular. Disk Flowers   In the Asteraceae family, the central, tubular flowers of the head. Compare ray flower. Disk Or Disc   The central portion of a capitate inflorescence, or the receptacle of such an inflorescence; also, a structure formed by the coalescence of stigmas as in the Papaveraceae family; also, the development of the receptacle at or around the base of a petals, as in Acer and Euonymus. Dissected   Cut or divided into narrow segments. Distal   The direction or point away from the point of attachment. Distichous   Arranged in two vertical series; two-ranked. Distigmatic   Bearing two stigmas. Distinct   Separate, and usually evident. Divaricate   Widely spreading or divergent. Divergent   Directed away from each other. Dorsal   Relating to the back or outer surface of an organ. Compare ventral Downy   Covered with soft hair. Drupe   A typically one-locular, fleshy or pulpy fruit with a hard or stony center. Drupelet   A small drupe. Back to top