1-celled

2-lobed

4-lobed

5-lobed

6-lobed

Abaxial

Abaxial: On the side facing away from the stem or axis. Adaxial: On the side facing the stem or axis.

Acaulescent

Stemless or nearly so.
achene

Achene

A small, dry, single-seeded fruit that does not split open.

Achenes

Acuminate

acute

Acute

Having a sharp point. The leaf tip tapers to a point with an angle smaller than 90 degrees, with more or less straight sides.

Adaxial

Adnate

Adnate: Joined to or attached to; applied to unlike organs, eg stamens adnate to the perianth. Connate: Joined to or attached to; applied to similar organs fused during development, eg stamens fused into a tube.

Adventitious

Arising from an unusual position, eg roots from a stem or leaf.

Aerial

Aerial_root

A root that originates above ground level.

Aestivation

Aestivation: The arrangement of the parts of a flower within the bud, usually referring to sepals and petals. Valvate: With the margins adjacent without overlapping. Imbricate: Petals (or sepals) overlapping, as in a tiled roo
alternate

Alternate

Leaves arrangement in which there is only one leaf at each node; (of stamens) between the petals. The leaves can be arranged in spiral (alternate spiral) or on two rows on opposite sides (alternate distichous) of the stems or clustered at the base of the axis.

Amphitropous

Ovules attached near its middle, half-inverted.

Anatropous

Ovules bent over through 180 degrees to lie alongside its stalk (funicle).
androecium

Androecium

Androecium: All the male reproductive organs of a flower, the stamens. Gynoecium: All the female reproductive organs of a flower, comprising one or more free or fused carpels.

Androgynophore

A column on which stamens and carpels are borne.

Angiosperm

A plant producing seeds enclosed in an ovary. A flowering plant.

Annual

A plant that completes its life cycle from germination to death within one year.

Annular

Ring-like.
anther

Anther

The terminal part of the male organs (stamen), usually borne on a stalk (filament) and developing to contain pollen.

Anther-cells

Antheridia

(singular antheridium). The male reproductive structure in moss and fern gametophytes

Anthers

Anthesis

The period of flowering; from the opening of the flower bud to the setting of the seed.

Anthocyanin

The pigment usually responsible for pink, red, purple, violet and blue colors in flowering plants.

Antipetalous

Occuring opposite the petals, on the same radius, as distinct from alternating with the petals.

Aperturate

Having one or more apertures.

Apetalous

Without petals.

Apex

Apex: The tip of an organ; the growing point. Apical: Pertaining to the apex.

Apical

Apically

apiculate

Apiculate

Mucronate: Tipped with a short, sharp, abrupt point (mucro). Apiculate: Ending abruptly in a small, slender point Acuminate: Narrowing gradually to a point.

Apocarpous

With carpels free from each other.

Apomixis

Reproduction by seed formed without sexual fusion. (adj. Apomictic).

Aquatic

Living in water.

Archegonia

(singular archegonium). The female reproductive structure in moss and fern gametophytes.

Areola

A small, well-defined area on a surface, as the area between the veinlets of a leaf or the region of a cactus bearing the flowers and/or spines.

Areolas

Areole

Areoles

Aril

A fleshy or sometimes hairy outgrowth from the hilum or funicle of a seed.

Asepalous

Without sepals.
auricle

Auricle

Auricle: Small ear-like projections at the base of a leaf or leaf blade or bract. Auriculate: Which has auricles.
awn

Awn

A stiff, bristle-like extension to an organ, usually at the tip.