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Flora of North America Glossary

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Term Synonyms Category Limitation Definition
dichotomous architecture axis Branching by division of the apical meristem producing two coordinate but not necessarily equal derivatives from each division.
diclesium pl. diclesia < accessory fruit, anthocarp nominative fruit An achene enveloped by a persistent, free perianth base.
diclinous > dioecious, monoecious reproduction taxon Having all flowers functionally unisexual. See also monoclinous (synoecious).
didynamous architecture flower, androecium Diadelphous with two stamens in each set. See also tetradynamous.
diffuse architecture plant, stem Having branches remote and divergent to divaricate.
diffuse-porous porosity Homogeneously porous, the vessels not differentially disposed by size or number.
diffuse root > fibrous root STRUCTURE Any member of a dense system of adventitious, slender roots that arise from the base of a main stem and functionally replace an evanescent primary root.
diffuse-rooted > fibrous-rooted architecture plant Having a dense system of adventitious, slender roots that arise from the base of the main stem and functionally replace an evanescent primary root. See also taprooted.
digamous reproduction inflorescence Bearing flowers of two differing sexual constitutions; esp. in Asteraceae (Compositae).
…digitate = …palmate architecture foliaceous structure Compound with the number of orders of leaflets indicated by the prefix, each order digitate; as in tridigitate.
digitate = palmate architecture foliaceous structure Compound with one order of leaflets all inserted at a common point and diverging from one another; or lobed (cleft, divided, parted, segmented), incised or ribbed in a similar hand-like pattern. Unless qualified to indicate otherwise, this term usually is understood to mean "palmately once-compound." See also …palmate, palmatifid, palmatipinnate, ternate.
dilate(d) solid shape elongate structure Narrow at one end and broadening toward the other; esp. when essentially terete at the narrow proximal end and seemingly flattened distally, as some anther filaments.
dimidiate plane shape Halved, figuratively; bilaterally asymmetric, nearly or wholly lacking one side as implicitly compared with some corresponding bilaterally symmetric structure, real or imagined.
dimidiate solid shape Halved, figuratively; bilaterally asymmetric, nearly or wholly lacking one side as implicitly compared with some corresponding bilaterally symmetric structure, real or imagined.
dioecious < diclinous reproduction taxon Having all flowers or spikelets functionally unisexual, each plant having only staminate or only pistillate types. See also monoecious.
diplecolobal arrangement cotyledons Incumbent but with the cotyledons folded together twice or more, the folds transverse.
diplostemonous architecture flower, androecium Having the stamens dicyclic, the proximal whorl with members directly above the sepals, the distal whorl with members directly above the petals. See also obdiplostemonous.
diplotegium pl. diplotegia nominative fruit A pyxis with accessory tissue adnate to the pericarp; derived from an inferior ovary.
disarticulating architecture axis Articulate(d) and with the main portions of the whole separating at the joints upon maturity or senescence.
disc 1 var. disk STRUCTURE Any distinct, annular to discoid structure produced from or borne upon a floral receptacle between or basal to any of the sets of floral organs; usually fleshy, often nectariferous.
disc 2 var. disk STRUCTURE Collectively, the disc florets of a capitulum (head), or the surface presented by them.
discal insertion Upon or otherwise directly associated with the floral disc.
discal position Upon or otherwise directly associated with the floral disc.
disc floret STRUCTURE A floret that has an actinomorphic corolla, is bisexual, functionally staminate, or functionally pistillate, and is borne in a radiate, discoid, disciform, or radiant capitulum (head) interior (distal) to any peripheral series of differing florets that may be present; in Asteraceae (Compositae).
disciform 1 = discoid solid shape Relatively thin with two round, plane or convex, opposite broad faces and a rounded circumferential edge; like a disc. See also lenticular (biconvex, lens-shaped), meniscoid, placentiform (placenta-shaped), trochlear (pulley-wheel-shaped).
Displaying 676-700 of 2673