microsporophyll |
> cone scale |
STRUCTURE |
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A sporophyll that bears only microsporangia. |
placenta pl. placentae, placentas |
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STRUCTURE |
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An ovule-bearing zone of the tissue surface bordering an ovary locule; of merely topographic, not histological, significance; may be a part of the ovary wall proper or an extension from it, or a part of the central axis of the ovary or an extension from it. |
involucre 2 |
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STRUCTURE |
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One or more closely proximate whorls, or a compact spiral, of bracts (phyllaries) surrounding (proximal to) the compound receptacle (torus) and florets of a capitulum (head); in Asteraceae (Compositae). |
sterigma pl. sterigmata |
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STRUCTURE |
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A portion of a lamina that is prolonged and adherent to the supporting axis beneath the point of vascular insertion. |
auricle |
= ear |
STRUCTURE |
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A small, rounded, lateral lobe at the base of a laminar structure, lying in more or less the same plane as the remainder of the lamina. |
hastula pl. hastulae, hastulas |
= ligule misapplied |
STRUCTURE |
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An outgrowth or enation from the petiole apex at its junction with the adaxial surface of a palmate leaf blade; often woody in texture; variously shaped, its adaxial outline usually resembling an inverted V or U, or a semicircle with the opening proximal; esp. in Arecaceae (Palmae). |
phyllopodium pl. phyllopodia |
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STRUCTURE |
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A stem-like axis composed of fused leaf bases; esp. in Arecaceae (Palmae), Musaceae. |
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). |
embryo |
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STRUCTURE |
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The rudimentary spermatophyte contained within a viable seed. |
female cone |
= macrostrobilus (not recommended), megastrobilus |
STRUCTURE |
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A cone (strobilus) whose fertile organs are all megasporophylls. |
fringe |
= fimbria |
STRUCTURE |
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A marginal series or cycle of regular, slender, closely adjacent, more or less flexible segments or protrusions, when treated as an aggregate structure. |
sheath (leaf) |
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STRUCTURE |
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The lower (basal or proximal), fundamentally laminar but strongly involute portion of one of the non-petiolate leaves characteristic of most monocotyledons (Liliidae); distinct from the leaf blade, which, when present, is borne distally upon it; analogous, though not necessarily homologous, with a petiole; usually more or less completely enclosing a portion of the stem above the node from which the leaf is borne. |
perianth tube |
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STRUCTURE |
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A relatively narrow, fully connate portion of a syntepalous (gamotepalous) perianth proximal to a broader portion (limb) that comprises the distinct or connate distal portions of the tepals. |
tendril |
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STRUCTURE |
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A slender stem branch, modified leaf, or portion of a leaf that twines about a supporting structure. |
raphides sing. raphis |
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STRUCTURE |
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Needle-like crystals of calcium oxalate contained within the cells of some plants; esp. in Araceae. |
wall (fruit, ovary, pollen, spore) |
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STRUCTURE |
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The exterior layer of tissue(s) enclosing anatomically distinct interior tissues and sometimes fluid and/or one or more cavities. |
tuber |
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STRUCTURE |
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An enlarged, basically subterranean stem segment or thallus outgrowth containing a high proportion of storage tissue and functioning as a perennating and often vegetatively propagative structure. |
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. |
floret |
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STRUCTURE |
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A very small, structurally specialized flower, especially when occurring in capitulum (head; Asteraceae), or in a spikelet (Poaceae), where it includes the immediately subtending bracts (lemma and palea). |
calyx tube |
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STRUCTURE |
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A relatively narrow, fully connate portion of a synsepalous (gamosepalous) calyx proximal to a broader portion (limb) that comprises the distinct or connate distal portions of the sepals. |
androgynophore |
< stalk |
STRUCTURE |
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A stalk that rises above the level of perianth insertion and bears the free portions of both androecium and gynoecium from its summit; as in Passifloraceae. |
microstrobilus |
= male cone |
STRUCTURE |
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A strobilus (cone) whose fertile organs are all microsporophylls. |
glochidium pl. glochidia |
= glochid; < bristle, capillus, hair, seta, trichome |
STRUCTURE |
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A capillus (hair) or bristle (seta) that bears one or more barbs; esp. in Cactaceae. |
barbellule |
= barbellula |
STRUCTURE |
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A small barbel (barbella); a very diminutive barb. |
haustorium pl. haustoria |
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STRUCTURE |
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An absorbing and anchoring organ, often root-like, excrescent from a vegetative part of a parasitic or hemiparasitic plant, by which the plant communicates intimately with and derives sustenance and support from its host plant, into whose tissues the haustorium intrudes. |