abaxial (15 images): on the side away from the axis.

abortive: hardly or imperfectly developed.

abscission (2 images): shedding of a part, often a leaf, flower, or fruit.

acaulescent (9 images): literally, without a stem.

accrescent (1 image): increasing in size with age, especially with reference to calyx.

accumbent: cotyledon position, lying edgewise against the folded radicle in the seed (see incumbent).

acerose (2 images): needle-shaped, or with a needle-like tip.

achene (32 images): the most generalized type of dry, indehiscent fruit.

acicular (4 images): needle-shaped.

acropetal (7 images): proceeding from the proximal to the distal end, often in reference to flower maturation in an inflorescence.

acroscopic (2 images): toward the distal (as opposed to the proximal) end.

actinomorphic (8 images): radially symmetric, as in a regular flower.

acuminate (6 images): gradually and concavely tapered to a narrow tip or sharp point.

acute (4 images): sharp pointed.

adaxial (10 images): on the side toward the axis, or turned toward the axis.

adnate (6 images): grown together, or attached; applied only to different plant parts (compare to connate).

adventitious (4 images): not in the usual place.

adventive: intro but not naturalized, or only locally established.

alate (4 images): winged.

allopatric: occupying different geographical regions.

alternate (18 images): situated singly at each node, as the leaves; situated regularly between organs of another kind, as stamens alternate with petals.

alveolate: honeycombed.

ament (6 images): a dense, bracteate spike or raceme with a nonfleshy axis bearing many small, naked or apetalous flowers; a catkin.

amplexicaul (5 images): clasping the stem.

ampliate (3 images): enlarged or expanding.

anastomosing (3 images): a reconnecting network of leaf veins.

anatropous: inverted ovule with the micropyle bent down to the funiculus, to which the ovule body is united.

androecium (3 images): the stamens considered collectively.

androgynous (3 images): a spike (in Carex) with both male and female flowers, the male above the female.

anemophilous: pollinated by wind.

angiosperm: a major group of vascular plants with ovules enclosed in an ovary (Magnoliophyta, the flowering plants).

angustiseptate (2 images): fruit morphology where the septum crosses the narrow direction of a laterally compressed fruit (see latiseptate).

annual (7 images): a plant that germinates, flowers, and seeds in a single season.

annulus: a little ring; the partial or complete ring of thick-walled cells encircling the sporangium of typical ferns.

anterior: in front.

anther (12 images): pollen-bearing part of the stamen.

anthesis (4 images): period during which a flower is fully expanded.

anthocyanin (5 images): a chemical class of water-soluble pigments, ranging in color from blue or violet through purple to crimson.

antrorse (2 images): directed forward or upward.

apetalous (3 images): without petals.

aphyllopodic: with the lowest leaves reduced to scales, the 1st foliage leaves thus well above the base of the plant, as in some species of Carex.

aphyllous: without leaves, or without typical foliage.

apiculate (4 images): ending abruptly in a small, generally sharp point.

apocarpous (2 images): with carpels free from each other, or with only 1 carpel.

apomictic: asexual reproduction without fertilization resulting in seed production.

apophysis (3 images): exposed, apical portion of a closed gymnosperm cone scale.

appressed (2 images): pressed flat against another organ.

approximate: near, together.

arachnoid (9 images): having a cobwebby, generally sparse pubescence of relatively long, soft, tangled hairs.

arborescent (2 images): treelike.

arcuate (5 images): curved into an arc.

areola, areole (4 images): a small, clearly bounded area on a surface.

argenteous: silvery in color.

aril (4 images): a specialized outgrowth from the seed stalk that covers or is attached to the mature seed.

arillate (2 images): provided with an aril.

aristate (5 images): tipped with an awn or bristle.

array (5 images): general term for inflorescence, often used in Asteraceae.

articulate(d) (4 images): jointed; with a predetermined point of natural separation.

ascending (7 images): growing obliquely upward (stems), directed obliquely forward in respect to the organ to which they are attached (parts of plant).

asepalous: without sepals.

atomate, atomiferous (4 images): with scattered sessile or subsessile glands.

atro- (4 images): Latin prefix, meaning dark or blackish.

attenuate (2 images): tapering gradually to a very slender tip.

auricle (7 images): a small, projecting lobe or appendage, generally at the base of an organ.

autotrophic: nutritionally independent.

awn (9 images): slender, generally terminal bristle.

axil (16 images): the area or angle formed by the attachment of the leaf blade or petiole with the stem.

axile placenta: a placenta along the axis of an ovary with 2 or more locules.

axillary (12 images): located in or arising from an axil.