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main stem |
= primary stem; > bole, trunk |
STRUCTURE |
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The one, or any of the more than one, first-order stem(s), or first-order portion(s) of the collective stem, of a shoot. |
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branchlet |
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STRUCTURE |
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A branch of the highest or ultimate order. |
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caudex pl. caudices |
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STRUCTURE |
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The short, persistent, thickened, more or less erect, main stem of a perennial plant that otherwise has annual stems. |
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rachilla 2 var. rhachilla |
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STRUCTURE |
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A second-order axis in an inflorescence, especially the axis bearing the florets in a spikelet; esp. in Cyperaceae, Poaceae (Gramineae). |
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embryotega pl. embryotegae, embryotegas |
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STRUCTURE |
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A small, hardened, lid-like portion of the testa (seed coat) at the micropyle of some seeds, detaching at germination. |
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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. |
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hypochilium |
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STRUCTURE |
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The proximal portion of a labellum (lip) that has distinct proximal, distal, and sometimes also central parts; in Orchidaceae. See also epichilium, mesochilium. |
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wing 1 |
= ala |
STRUCTURE |
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Any elongate, relatively thin protrusion or appendage. |
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column 2 |
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STRUCTURE |
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A fused androecium (connate stamens) closely surrounding but free from the gynoecium; esp. in Malvaceae. |
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phyllode |
= phyllodium |
STRUCTURE |
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A leaf deemed to consist entirely or almost entirely of tissues evolutionarily derived from the petiole, all or a distal portion of which has become expanded and blade-like, the original blade reduced to the point of absence or vestigiality. |
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megastrobilus pl. megastrobili |
= female cone, macrostrobilus (not recommended) |
STRUCTURE |
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A strobilus (cone) whose fertile organs are all megasporophylls. |
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crista pl. cristae |
= crest |
STRUCTURE |
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A laterally elongate, relatively thin, irregular or notched, apical protrusion. |
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rhachis |
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STRUCTURE |
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See rachis. |
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fruit |
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STRUCTURE |
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Any unitary seed-bearing structure of a flowering plant, consisting of the matured or ripened pistil(s) of one or more flowers along with any other floral or vegetative tissue(s) persisting adnate to them; characteristic of and unique to Magnoliophyta (Angiospermae). |
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diffuse root |
> fibrous root |
STRUCTURE |
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Any member of a dense system of adventitious, slender roots that arise from the base of a main stem and functionally replace an evanescent primary root. |
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flower |
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STRUCTURE |
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A functionally integrated, complex structure comprising sets of sporophytic and/or associated sterile structures disposed in standard sequence along a common axis; consisting of one or more constituent members each of, in ascending (proximal to distal) order of insertion, perianth (tepals, or else sepals and/or petals), androecium (stamens, staminodes and/or other associated structures), and/or gynoecium (pistils and/or other associated structures), the foregoing all borne laterally from the distal portion (receptacle) of the axis; depending upon the combination of structures present, may be bisexual, staminate only, pistillate only, or sterile; characteristic of and unique to the Magnoliophyta (Angiospermae). When a fertile androecium and gynoecium are both present a flower is termed perfect. When perfect and also with calyx and corolla both present, a flower is termed complete. Both terms are somewhat archaic and of limited descriptive value. |
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haft |
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STRUCTURE |
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The narrow portion of a structure that is notably constricted. |
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accessory cell |
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STRUCTURE |
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One of the cytologically distinctive epidermal cells that are sometimes present in a stomate and that surround and are regularly oriented in relation to the guard cells. |
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lobe |
? division, segment |
STRUCTURE |
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Any generally convex, major peripheral protrusion or component sector that is delimited by concavities in the surface or margin and that is not proximally distinct from the remainder of the whole. |
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caudicle |
= translator arm |
STRUCTURE |
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An attenuate end portion by which a pollinium adheres to a pollinating insect, either directly or by means of a terminal viscidium, the latter, when present, sometimes attached by an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
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rachis 1 var. rhachis |
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STRUCTURE |
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A main or first-order axis of a compound leaf blade. |
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hypocotyl |
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STRUCTURE |
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That portion of an embryo axis between the level of cotyledon insertion above and the root meristem (or radicle, if present) below. |
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tunic |
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STRUCTURE |
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A membranous covering outside the epidermis, especially around bulbs and corms, often becoming loose, sometimes scarious. |
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wing 2 |
= ala |
STRUCTURE |
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One of the two lateral petals in a papilionaceous corolla. |
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column foot |
= mentum |
STRUCTURE |
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A lateral, often nectariferous protrusion from the proximal portion of a column, opposite the labellum, projecting in front of the rest of the flower; in Orchidaceae. |
