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rachilla 1 var. rhachilla |
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STRUCTURE |
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A second- or higher-order axis of a compound leaf blade, bearing higher-order rachillae, leaflets, pinnules and/or tendrils. |
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embryo sac |
< megagametophyte |
STRUCTURE |
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The multinucleate generative cell of an ovule, within which fertilization and zygote formation occur; resulting from meiotic division of a megaspore mother cell within the nucellus, and thus genetically haploid; its contents generally considered to represent an evolutionarily reduced gametophyte. |
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lamina 2 pl. laminae |
= ray |
STRUCTURE |
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The distal, relatively flat portion of the zygomorphic corolla of a ray floret, terminating in 0--4 teeth or lobes; in Asteraceae (Compositae). |
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basal cell |
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STRUCTURE |
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Any of the ring of cells forming the lowermost (proximal) portion of an antheridial wall. |
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columella 2 pl. columellae, columellas |
= carpophore; < stalk |
STRUCTURE |
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The stalk supporting a mericarp after dehiscence of a schizocarpic fruit, the central axis of the fruit having split longitudinally to yield two or four such stalks; composed of receptacular and (primarily) gynoecial tissues; esp. in Apiaceae (Umbelliferae). |
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phyllary |
= involucral bract; < bract (broad sense) |
STRUCTURE |
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One of the bracts composing the involucre of a capitulum (head); in Asteraceae (Compositae). |
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rosette |
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STRUCTURE |
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A set of leaves that are strongly congested and disposed in radial symmetry about the main stem at or very near its base, seeming to arise at the same level and often overlapping laterally; esp. the overwintering leaves of perennial herbs. |
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squamule 2 |
= squamella; < scale |
STRUCTURE |
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A small, dry bract borne on the compound receptacle (torus) of a capitulum (head); in Asteraceae (Compositae). |
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vexillum pl. vexilla |
= banner, standard |
STRUCTURE |
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The relatively large, erect adaxial (upper) petal in a papilionaceous corolla. |
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megasporocarp |
= macrosporocarp (not recommended) |
STRUCTURE |
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A sporocarp that bears only megasporangia. |
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rhachilla |
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STRUCTURE |
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See rachilla. |
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frond |
< leaf, macrophyll (not recommended), megaphyll |
STRUCTURE |
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A leaf in Polypodiophyta or Palmae (Arecaceae), usually relatively large and often highly dissected. Use of this term in preference to "leaf" in descriptions of ferns and palms is a matter of tradition only, not of morphological or evolutionary distinction. |
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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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operculum pl. opercula |
= lid |
STRUCTURE |
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A distal, cover-like portion of a structure whose main body is otherwise closed, transversely discontinuous with the main body around most of the circumference, or becoming partially or wholly separate by transverse dehiscence; as of an ascidium (pitcher), pollen grain, pyxis, or sporangium (spore case). |
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column 1 |
= gynandrium, gynostemium |
STRUCTURE |
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A central floral structure consisting of the partly to wholly fused (connate and adnate) androecium and gynoecium; esp. in Orchidaceae. |
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phylloclade |
= cladode, cladophyll |
STRUCTURE |
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A stem segment that functions as a leaf; often more or less compressed. |
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squamule 3 |
= lodicule, squamella |
STRUCTURE |
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One of two or three small, scale-like structures inserted at the base of the androecium, distal to the palea, in most grass (Poaceae) flowers; often regarded as a vestigial branch or perianth member. |
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megasporophyll |
= macrosporophyll (not recommended); > carpel, cone scale, ovuliferous scale |
STRUCTURE |
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A sporophyll that bears only megasporangia and, in Pinophyta, naked ovules that develop subsequently. |
