|
rhipidiate |
|
architecture |
inflorescence |
Comprising one or more rhipidia. |
|
reduced |
|
size |
|
Unusually or unexpectedly small. |
|
heartwood |
|
STRUCTURE |
|
The senescent inner or central portion of the wood (xylem) of an older stem or root, its cells no longer living, in which conduction has ceased and primary reserve materials are no longer stored; often containing terminal metabolic products; usually darker in color than the living, conducting sapwood that encircles it. |
|
hydathode |
|
STRUCTURE |
|
A multicellular, anatomically distinctive structure located within a leaf at its periphery, its cells surrounding a central canal that opens to the exterior, through which water is actively discharged under humid conditions that impede the rate of transpiration; this liquid discharge is termed guttation. |
|
seed |
|
STRUCTURE |
|
A mature or ripened ovule containing an embryonic sporophyte and a nutritive tissue (endosperm or perisperm) with stored food that sustains the initial growth of the embryo upon germination, except when such food reserve is stored instead in the cotyledon(s) of the embryo itself, these enclosed by one or two integuments (the testa), the whole serving as a propagule. A fertile seed (one containing a viable embryo) normally results from sexual fertilization of an egg by a sperm; however, fertile seeds are sometimes produced asexually by apomictic processes (e.g., parthenogenesis). |
|
clambering |
|
habit |
plant, axis |
Reclining upon and spreading across other plants or objects without the aid of special holding structures or growth patterns. |
|
involute 2 |
|
vernation |
|
Each rolled adaxially from the lateral margins. |
|
scaly 2 |
|
architecture |
bud, bulb |
Invested by scale-like (squamiform) structures. |
|
chambered |
|
architecture |
pith |
Interrupted by cavities that are more or less regularly spaced along the axis and that result from disintegration of tissue prior to axis maturity. |
|
lenticel |
|
STRUCTURE |
|
A specialized, anatomically distinct structure within the periderm of a stem, consisting of comparatively spongy, sometimes suberized tissue distinct from others of the periderm; extending radially through the periderm and visible as a circular to elongate discontinuity in the color, texture, and/or relief of the outer surface of the stem; serving as a conduit for gas exchange between the stem interior and the atmosphere. |
|
concentric |
|
position |
|
Having a center or axis of symmetry coincident with that of the context of reference. |
|
apiculum 1 pl. apicula |
|
STRUCTURE |
|
A short, slender, angular tip that is not notably harder or stiffer than the main body of the bearing structure. See also mucro. |
|
lanulose |
|
pubescence |
|
Finely lanate. |
|
spore |
|
STRUCTURE |
|
A simple, usually unicellular, sometimes oligocellular propagule derived by meiotic division of a diploid (2n chromosomes) sporocyte within a sporangium, thus of haploid (n chromosomes) genetic constitution. A spore constitutes the first ontogenetic stage of a gametophytic generation and gives rise to a usually multicellular gametophyte upon germination. Though technically present in seed-bearing plants, by itself it is descriptively significant only in those taxa that do not produce seeds. |
|
collateral |
|
insertion |
buds |
In pairs within or immediately straddling the leaf axils, the members of a pair lateral to one another. |
|
anisostemonous |
|
architecture |
flower, androecium |
Having stamens unequal in size and/or shape. |
|
spiculate |
|
relief |
|
Having small, fine, stiff, acute protrusions that resemble little spikes. See also scabridulous (scabrellate, scabrellous, which is not clearly distinct in its application. |
|
costule |
|
STRUCTURE |
|
A longitudinal primary vein in a diminutive laminar structure, such as the blade of a leaflet, pinna or pinnule; a diminutive costa (rib). |
|
microsporangium pl. microsporangia |
|
STRUCTURE |
|
A sporangium that produces microspores. |
|
acrocaulous |
|
position |
|
At or very near the stem tip. |
|
diffuse-porous |
|
porosity |
|
Homogeneously porous, the vessels not differentially disposed by size or number. |
|
symmetric(al) 2 |
|
architecture |
flower |
Having the perianth members in whorls that are actinomorphic and equal in number of members. |
|
superior 2 |
|
position |
ovary |
Not enclosed to any degree by a floral tube casing, the perianth and/or androecium thus arising beneath (proximal to) it. |
|
drupelet |
|
nominative |
fruit |
Diminutively drupe-like but derived from one of the simple, superior ovaries of an apocarpous flower, having a fleshy fruit wall and a hard seed (pyrene) within, a distinct constituent in an aggregate fruit; esp. in Rosaceae. |
|
obcordate |
|
plane shape |
|
Inversely cordate (heart-shaped). |
