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disc 1 var. disk |
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STRUCTURE |
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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. |
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spicule |
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STRUCTURE |
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A small, fine, stiff, acute protrusion that resembles a little spike. |
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thallus 2 pl. thalli |
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STRUCTURE |
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The main body of a gametophyte, bearing rhizoids, gametangia (antheridia and/or archegonia), and/or gemmae cups; usually thin and more or less planate, inconspicuous, and growing appressed to or beneath the substrate surface; in Psilotophyta, Lycopodiophyta, Equisetophyta, Polypodiophyta. See also prothallus. |
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lateral vein |
>< costa, primary vein, rib; > secondary vein |
STRUCTURE |
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A longitudinal primary vein (costa, rib) that runs to one side of the midline, or a secondary vein that runs toward the lateral margin. See also tertiary vein, veinlet. |
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antherozoid |
= spermatozoid; < sperm |
STRUCTURE |
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A motile male gamete, produced within an antheridium. |
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mucro pl. mucrones, mucros |
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STRUCTURE |
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A short, hard, apical point that is a continuation of vascular tissue. See also apiculum. |
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ovule |
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STRUCTURE |
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A complex reproductive structure borne by a seed-plant sporophyte, consisting of outer, sporophytic tissues that enclose a haploid, gametogenic tissue usually regarded as a highly reduced megagametophyte. Following fertilization, the entire structure matures to become a seed that contains an embryo, the first stage of the next sporophytic generation. Ovules (and seeds) are borne naked on megasporophylls (in Pinophyta) or within an ovary (in Magnoliophyta). |
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elaiosome |
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STRUCTURE |
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A fleshy outgrowth from the seed coat (testa) that contains a high proportion of oil, usually attracting ants for dispersal. |
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fiddlehead |
= crozier |
STRUCTURE |
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A circinate leaf (frond) prior to full expansion, while still wholly or distally coiled; esp. in Polypodiophyta. |
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staminode |
= staminodium |
STRUCTURE |
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Any sterile structure deemed to represent a modified stamen, homology being inferred on the basis of structural similarity, ontogeny, and/or position; sometimes petaloid, sometimes nectariferous, sometimes connate with others or adnate to other floral structures. |
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labium pl. labia |
= lip; > labellum |
STRUCTURE |
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Any substructure that resembles a lip, especially a portion of a perianth, calyx or corolla; in Lamiaceae (Labiatae) sometimes restricted to the abaxial (lower) of the two corolla lips. |
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androecium pl. androecia |
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STRUCTURE |
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The stamen(s), staminode(s), if any, and their ontogenetically associated structure(s), if any, of a single flower, taken collectively. |
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banner |
= standard, vexillum |
STRUCTURE |
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The relatively large, erect adaxial (upper) petal in a papilionaceous corolla. |
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microspore |
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STRUCTURE |
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A male spore; a spore of the smaller of the two types produced by the sporophytes of a heterosporous taxon; produced in a microsporangium; giving rise upon germination to a microgametophyte. |
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calyx pl. calyces |
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STRUCTURE |
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Collectively, the sepals of a flower, whether distinct or connate; the outer or proximal envelope of a differentiated perianth, whether the other envelope (corolla) is also actually present or is deemed to be secondarily absent due to evolutionary reduction. |
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sucker |
> turion |
STRUCTURE |
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A shoot arising adventitiously from a root or stem below or at ground level. |
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ala 1 pl. alae |
= wing |
STRUCTURE |
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Any elongate, relatively thin protrusion or appendage. |
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massula pl. massulae |
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STRUCTURE |
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A body of coherent pollen grains, dispersed as a unit; esp. in Asclepiadaceae, Orchidaceae. |
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bulbel |
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STRUCTURE |
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A comparatively small bulb branching laterally from a larger, currently primary one. |
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peduncle |
<stalk, stipe (broad sense, not recommended) |
STRUCTURE |
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The common stalk, when present, of a compound inflorescence or first-order subunit thereof, or of a solitary flower that is deemed to represent an evolutionarily reduced compound inflorescence. |
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disc 2 var. disk |
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STRUCTURE |
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Collectively, the disc florets of a capitulum (head), or the surface presented by them. |
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theca pl. thecae |
= pollen sac |
STRUCTURE |
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Any of the one, two or four ontogenetically distinct, pollen-producing sectors (microsporangia) of an anther. In some taxa the walls between pairs of adjacent thecae break down as an anther approaches maturity, the mature anther thus ultimately containing half as many locules as thecae. |
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archegonium pl. archegonia |
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STRUCTURE |
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A female gametangium; a multicellular fertile organ of a mature gametophyte within which female gametes (eggs, ova) are produced and fertilized; having a broad, bulbous base and a narrower distal neck. Technically present but highly reduced and of no descriptive significance in Magnoliophyta. |
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stolon |
= runner |
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. |
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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. |
