perisperm |
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STRUCTURE / SUBSTANCE |
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A genetically diploid (2n chromosomes) nutritive tissue in a seed; containing stored carbohydrate and/or oil utilized by the embryo prior to and especially upon germination; derived from the nucellus. See also endosperm (albumen). |
lacuna pl. lacunae |
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FEATURE |
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A hole or cavity; an empty space surrounded by tissue in two or three dimensions. |
tertiary vein |
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STRUCTURE |
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A strand belonging to the third order of vasculature in a leaf or other basically laminar structure, except when that is the ultimate order (consisting of veinlets); branching from a primary or secondary vein. See also costa, lateral vein, primary vein, rib, secondary vein, veinlet. |
…faced |
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solid shape |
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Having relatively large, flat or shallowly curved portions of the external surface that are bounded by more or less distinct angular discontinuities in that surface, of the number indicated by the prefix; as in three-faced. |
sack-shaped |
= bag-shaped, pouch-shaped, saccate |
solid shape |
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Irregularly obovoid with an exterior aspect intermediate between inflated and flaccid; like a closed pouch or bag. |
wedge-shaped 2 |
= cuneate, obtriangular |
plane shape |
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Inversely triangular; like the outline of the broad lateral face of a wedge, broadest at the apex. See also obdeltate. |
enation |
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STRUCTURE |
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A relatively small outgrowth from an otherwise regular boundary or surface of a larger structure. |
spotted |
= blotched, maculate |
coloration |
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Having one or more areas that differ in color from the rest of the surface. See also eyespotted. |
poricidal |
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dehiscence |
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Forming one or more apertures in the exterior wall, usually apically or sub-apically, through which the contents pass to the outside. |
…lobed |
? …cleft, …fid, …lobate, …parted, …partite, …segmented |
plane shape |
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Having the number of lobes indicated by the prefix; as in five-lobed. |
craspedodromous, mixed- |
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venation |
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Having a midvein that branches to either side along the length of the lamina, the secondary veins running thence toward the margin, some becoming indistinct before reaching it, others terminating there. |
tuft |
> coma |
STRUCTURE |
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A distinct, compact, relatively dense, homogeneous aggregation of plants or constituent structures such as stems, branches, leaves, bracts or trichomes. |
hyphodromous |
= one-veined, single-veined |
venation |
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Having one median, primary vein and no other venation externally evident. |
style |
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STRUCTURE |
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A narrow, usually elongate, ontogenetically distal portion of a simple or compound pistil, overtopping the ovary and bearing one or more stigmas; arising from the summit of the ovary, but sometimes apparently from its base at maturity to ontogenetic displacement from its primordial distal position. In a compound pistil the various simple (carpellary) components of the style(s) may not be connate over their entire lengths; the pistil is then regarded as having a branched style or styles. |
radiant 2 |
= radial, radiate, stellate |
arrangement |
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Disposed about and mutually divergent from a common geometric center in two or three dimensions, thus collectively actinomorphic. |
determinate |
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development |
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Having the terminal (central, apical, or distal) portion differentiating first and the lateral (peripheral, basal, or proximal) portions later, development thus proceeding sequentially downward or outward, growth of the whole thereby organizationally limited. |
vesicle |
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STRUCTURE |
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A small bladder-like part consisting of an enclosing wall or covering and an empty or fluid-filled interior, sometimes turgid; esp. in citrus fruits (hesperidia). |
gongyloid |
= gongylodate, knob-shaped, knot-shaped, nodiform |
solid shape |
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Approximately globose, the surface convoluted or not, like a knob or knot; usually applied only to structures or components that are relatively small. |
coriaceous |
= leathery |
texture |
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Moderately thick, tough, and very pliable. |
obovate |
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plane shape |
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Inversely ovate (egg-shaped). |
hirsute |
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pubescence |
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Bearing coarse, rough, elongate, more or less erect, capillate trichomes. See also hirtellous. |
stipel |
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STRUCTURE |
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A stipular analogue subtending a leaflet. |
branch |
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STRUCTURE |
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Any higher-order division of or outgrowth from an axis, vein or veinlet when such division or outgrowth is equivalent in nature to the structure of origin. |
arachnoid |
= cobwebby |
pubescence |
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Of fairly sparse, fine, white, loosely tangled, capillate trichomes. |
megaspore |
= macrospore (not recommended) |
STRUCTURE |
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A female spore; a spore of the larger of two types produced by the sporophytes of a heterosporous taxon; produced in a megasporangium; giving rise upon germination to a megagametophyte. |