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bifurcate |
< forked, furcate |
apex |
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Having two terminal, antrorse branches or divisions arising from a common point or level, like the prongs of a fork. |
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midvein |
= midnerve, midrib; < costa, nerve, rib, vein |
STRUCTURE |
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A primary vein that runs longitudinally through the center of a leaf or other basically laminar structure. See also lateral vein, secondary vein, tertiary vein, veinlet. |
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conjugate |
= geminate, paired |
arrangement |
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Inserted by pairs, the members of each fused or not. |
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decussate |
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arrangement |
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Opposite with successive pairs radially oriented at right angles to one another, thus polystichous with four equidistant ranks. |
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ring-shaped |
= annular |
solid shape |
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More or less evenly tubular in a closed circle; like a ring or doughnut. |
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fissure |
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FEATURE |
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A relatively narrow, split or crack in the outer tissue(s) of a structure. |
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squama pl. squamae |
= lepis; < scale, trichome |
STRUCTURE |
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A relatively thick, planate trichome. See also squamella (squamule). |
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…sulcate |
= …colpate, …fossulate, …furrowed, …grooved, …valleculate |
architecture |
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Having the number of sulci indicated by the prefix; esp. pollen grains; as in monosulcate, polysulcate, 3-sulcate. |
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lamella pl. lamellae |
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STRUCTURE |
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A thin layer of tissue that forms a plate within tissue of lesser density or between areas of empty space. |
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transverse 2 |
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orientation |
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Perpendicular to the long axis of the context of reference. |
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verticillate |
= cyclic, seriate, whorled |
arrangement |
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Disposed along the axis in groups of three or more, the members of each group (cycle, series, verticil, whorl) inserted regularly around the axis at the same level. |
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angular |
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plane shape |
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Having sides that meet at acute or obtuse angles. |
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bark |
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STRUCTURE |
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The outermost portion of any shoot or root axis having secondary growth, consisting of all those tissues outside the vascular cambium; sometimes exhibiting zonation into inner, living bark and outer, dead bark; usually described only as to external appearance. |
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medial |
= central, median |
position |
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At, upon, or closely ranged about the structural or symmetrical midpoint or axis. |
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capillary |
= capillate, hair-like |
solid shape |
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Finely filiform; like a hair. |
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cup-shaped |
= calyciform, cupulate |
solid shape |
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Truncate-globose with the distal margin more or less entire; like the bowl of a cup. |
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prickly |
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architecture |
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Bearing prickles. |
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resinous 2 |
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texture |
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Having the consistency of resin. |
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spine |
= thorn |
STRUCTURE |
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Any sharp, stiff, simple or branched, woody appendage having vascular tissues confluent with those of the bearing structure. "Spine" is often preferred when the appendage is homologous with a leaf or stipule, and "thorn" when it is homologous with a branch. See also prickle. |
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hilum 2 pl. hila |
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FEATURE |
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The more or less central point within a starch grain of intracellular origin, about which the successive layers of starch were accreted more or less symmetrically. |
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subglobose |
= suborbicular, subrotund, subspheric(al), subspheroid(al) |
solid shape |
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Broadly ellipsoid with a length:width ratio closely approaching 1:1; almost globose, slightly longer than broad. |
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jointed |
= articulate(d) |
architecture |
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Elongate with one or more distinct, relatively narrow zones of demarcation between adjacent main portions of the whole, these joints (articulations) often thicker and sometimes sites of eventual abscission. |
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thrice-… |
= tri…, triple-… |
prefix |
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Indicating presence of three hierarchical orders of the type of entity or pattern denoted by the term's stem; as in thrice-pinnate. See also three-… (tri…). |
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vallecula pl. valleculae |
= colpus, fossula, furrow, groove, sulcus |
STRUCTURE |
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A longitudinal depression that is relatively shallow and narrow; esp. in fruits of Apiaceae (Umbelliferae). |
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alveolate |
= honeycombed |
relief |
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Having generally uniform, regularly and closely disposed, transversely polygonal depressions overall, the pattern resembling the external aspect of a honeycomb. |
