crozier |
= fiddlehead |
STRUCTURE |
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A circinate leaf (frond) prior to full expansion, while still wholly or distally coiled; esp. in Polypodiophyta. |
elater 2 |
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STRUCTURE |
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An elongate, flattened, hygroscopic enation from a spore, straightening upon desiccation and aiding transport by air; esp. in Equisetaceae. |
sawtoothlet |
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STRUCTURE |
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A diminutive sawtooth. See also scallop (crena), scalloplet (crenule), tooth (dens), toothlet. |
adventitious bud |
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STRUCTURE |
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A vegetative or floral bud that arises directly from a root or from some site on a shoot other than a leaf axil or stem apex. |
ostiole |
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STRUCTURE |
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The distal aperture of a syconium (fig); in Ficus (Moraceae). |
primary vein |
> costa, midnerve (not recommended), midrib, midvein, rib; >< lateral vein |
STRUCTURE |
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A strand belonging to the first order of vasculature in a leaf or other basically laminar structure. See also secondary vein, tertiary vein, veinlet. |
sorus pl. sori |
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STRUCTURE |
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A cluster of sporangia borne upon a fertile frond, usually on its abaxial surface; often covered during maturation by a protective membrane, the indusium, that is an outgrowth from the epidermis; in Polypodiophyta. |
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. |
nucellus pl. nucelli |
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STRUCTURE |
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The distinct, genetically diploid tissue layer immediately surrounding the embryo sac of an ovule; often considered equivalent to a megasporangium wall. |
stylopodium pl. stylopodia |
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STRUCTURE |
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A discoid enlargement at the base of the styles; esp. in Apiaceae (Umbelliferae). |
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. |
floral cup 1 (broad sense) |
= floral tube, hypanthium (broad sense) |
STRUCTURE |
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A complex structure comprising fused portions of the perianth and/or androecium of a flower, sometimes also including receptacular tissue; surrounding and wholly, partly, or not at all adnate to the gynoecium; subdivided morphologically into casing, collar and/or neck; sometimes bearing free distal portions of the constituent structures. |
macrosporocarp (not recommended) |
= megasporocarp |
STRUCTURE |
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A sporocarp that bears only macrosporangia (megasporangia). |
pollinarium pl. pollinaria |
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STRUCTURE |
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A pollinium together with, when present, its stipe and viscidium; the entire unit of pollinium dispersal. |
knee root |
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STRUCTURE |
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A specialized secondary root of a wetland tree, a portion of which projects above mean water level and appears to bend as a leg does at the knee, its distalmost portion being anchored in the substrate beneath the water. The knee of the root is commonly regarded as a conduit for gas exchange between root interior and atmosphere, a function whose need is posited on the basis of the highly anaerobic and saturated conditions prevailing in wetland substrates. |
phylloclade |
= cladode, cladophyll |
STRUCTURE |
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A stem segment that functions as a leaf; often more or less compressed. |
taproot |
< primary root |
STRUCTURE |
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A primary root that remains dominant through the life of the plant as the main axis of a vertically oriented system that penetrates the substrate to a considerable depth. |
runner |
= stolon |
STRUCTURE |
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A slender stem that grows horizontally upon or just beneath the ground surface, rooting at the nodes and giving rise to erect shoot segments at some nodes and/or at its apex. |
female cone |
= macrostrobilus (not recommended), megastrobilus |
STRUCTURE |
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A cone (strobilus) whose fertile organs are all megasporophylls. |
arillus pl. arilli |
= aril (strict sense); < aril (broad sense) |
STRUCTURE |
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An appendicular structure that wholly or partly envelops a seed and is an outgrowth from the funicle or raphe, and thus is ontogenetically derived from the placenta; usually fleshy or pulpy, sometimes spongy or tufted-capillate, often brightly colored. |
neck (archegonial) |
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STRUCTURE |
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The distal narrowed portion of an archegonium above its bulbous base. |
husk |
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STRUCTURE |
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A more or less dry, hard or fibrous, simple or compound enclosure or outer layer of a seed, fruit or inflorescence. |
throat 1 |
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STRUCTURE |
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The far distal portion of a perianth, calyx, or corolla tube, or of a leaf sheath, surrounding the orifice of the tube or sheath, sometimes constricted relative to the diameter of the main body of the tube or sheath; except in disc florets of Asteraceae (Compositae). |
epicotyl |
= plumule |
STRUCTURE |
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A distinguishable nascent shoot developed in the embryo in some taxa, consisting of a shoot axis with unexpanded internodes and one or more leaf primordia, being that portion of the embryo above the level of cotyledon insertion; the primordial shoot, when developed by the embryo within a seed; the first bud of a spermatophyte, when developed by an embryo within the seed. In other taxa the shoot is represented in the embryo only by a quiescent apical meristem at the summit of the embryonic axis. |
cone |
= strobilus; > female cone, macrostrobilus (not recommended), male cone, megastrobilus, microstrobilus |
STRUCTURE |
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A compound or complex reproductive structure consisting of a central axis bearing congested imbricate sporophylls and sometimes also sterile bracts. |