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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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succulent |
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texture |
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Herbaceous and juicy, often thickened (incrassate). |
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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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pericarp |
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STRUCTURE |
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The portion of a fruit wall that is derived from the ovary wall; consisting of three more or less distinct tissue layers (exocarp or epicarp, mesocarp, and endocarp) that may or may not differ greatly in structure and/or function; the wall of a fruit, excluding any tissues of extra-ovarian (accessory) origin. |
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ovuliferous scale |
< cone scale, macrosporophyll (not recommended), megasporophyll |
STRUCTURE |
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A fertile scale in a female cone (megastrobilus), bearing one or two naked ovules, and subsequently seed(s), subtended by and borne closely upon a sterile, fleshy or woody scale sometimes termed a bract scale; in Pinophyta. |
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obtriangular 2 |
= cuneate, wedge-shaped |
plane shape |
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Inversely triangular; like the outline of the broad lateral face of a wedge, broadest at the apex. See also obdeltate. |
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twig |
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STRUCTURE |
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The terminal portion of an ultimate branch of a woody stem, representing the most recent increment of growth and bearing or having borne the current or most recent increment of leaves. See also branchlet. |
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square |
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plane shape |
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Equilaterally rectangular. |
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glabrous |
= bald, psilate |
pubescence |
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Lacking trichomes. |
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discoid 1 |
= disciform |
solid shape |
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Relatively thin with two round, plane or convex, opposite broad faces and a rounded circumferential edge; like a disc. See also lenticular (biconvex, lens-shaped), meniscoid, placentiform (placenta-shaped), trochlear (pulley-wheel-shaped). |
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mucilaginous 1 |
= mucous; < glutinous |
coating |
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Of a slimy substance, or becoming so upon wetting. |
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ribbed 1 |
= costate |
architecture |
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Having one or more ribs (costae). |
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mucilaginous 2 |
= mucous; < glutinous |
texture |
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Slimy. |
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ribbed 2 |
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solid shape |
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Having two or more prominent, elongate, relatively narrow, essentially parallel protrusions that extend over all or most of its length or circumference. |
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single-veined |
= hyphodromous, one-veined |
venation |
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Having one median, primary vein and no other venation externally evident. |
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intercostal |
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position |
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Between the costae. |
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primary axis |
> ray |
STRUCTURE |
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A main or first-order axis within any specified, uniformly delimited structural context. |
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pubescent 1 (broad sense) |
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pubescence |
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Bearing trichomes. This is one of the most ambiguous terms in the botanical lexicon; it should not be used unless its intended meaning is explicit. |
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capitate 3 |
= capitiform, head-shaped |
solid shape |
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Basically globose and resembling a head in the context of occurrence. |
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notch |
= emargination |
FEATURE |
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A relatively small, acute sinus at the distal end of a laminar structure. |
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epirhizal |
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position |
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Upon or arising from the roots. |
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spiral 3 |
= helical |
course |
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Curving with constant or regularly increasing radius from one end to the other through three dimensions. |
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suberous |
= corky |
texture |
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Firm, relatively light, discontinuous but strongly cohesive, and resilient. |
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fimbria pl. fimbriae |
= fringe |
STRUCTURE |
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A marginal series or cycle of regular, slender, closely adjacent, more or less flexible divisions or protrusions, when treated as an aggregate structure. |
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wood |
= xylem |
STRUCTURE |
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The water-conducting and usually main supporting tissue of a plant or portion thereof, characterized by the presence of tracheary elements (tracheids and sometimes vessel elements); the lignified tissue of a plant or component structure, composed almost entirely of secondary tissue, i.e., that derived by secondary or lateral growth from a cambium in structures a season or more old. As commonly used, the term wood generally refers only to secondary xylem, which constitutes the bulk of a mature woody stem, but it properly refers also to primary xylem, wherever found. See also sapwood, heartwood. |
