Displaying 41 - 80 out of 621 Object(s)
| Term | Definition | |
|---|---|---|
| Aperture (aperturate) | Referring to an opening into an organ; e.g., pollen grains with pores are aperturate and those without them are inaperturate. | |
| Apex | The tip or distal end of a structure such as a stem or leaf. | |
| Apical | Toward the apex. Opposite of basal. Same as distal. |  |
| Apical pore | An opening at the apex of a structure; e.g., the flower of some species of Monimiaceae or the anthers of some species, such as, Gustavia augusta (Lecythidaceae). |  |
| Apical style | Same as terminal style. | |
| Apiculate | Terminating abruptly in a short, sharp point or apiculus. | |
| Apiculus | A short, sharp point. | |
| Apophysis | A projection or protuberance. | |
| Appendage | A secondary structure or outgrowth attached to a main structure; e.g., the outgrowths on anthers of Melastomataceae or species of Viola. |  |
| Appendaged | Bearing an appendage. Same as appendiculate. | |
| Appendicular | Of or relating to appendages. | |
| Appendiculate | Bearing appendages. Same as appendaged. | |
| Apposition | Two plant structures placed side by side or against each other. | |
| Appressed | Lying flat against a surface or axis; e.g., trichomes, leaves, or bracts. |  |
| Arachnoid | Like a spider’s web, usually because of a pubescence of fine, entangled hairs. | |
| Arbusculiform | See dendritic. | |
| Arcuate | Curved like a bow, often used to describe venation. | |
| Areolate | Possessing areoles; in mimosoid and caesalpinioid legumes, referring to seeds with a pleurogram. | |
| Areole (areola) | A flattened spot, circular or elliptic in outline, often on the apex of the seeds of some Violaceae (e.g., Rinorea); the smallest area of an organ (e.g., a leaf), enclosed by united veins; the spine-bearing area in the leaf axils of Cactaceae. | |
| Aristate | Bearing an elongate, narrow appendage at the apex of a structure (organ); e.g., the lemmas of some species of Poaceae. | |
| Armed | Plants provided with prickles, spines, or thorns. |  |
| Articulate | Having nodes or joints or constrictions, often of the pedicel, where a part of a structure will naturally break off. | |
| Articulation |  | |
| Asymmetrical | Referring to a structure that cannot be divided into mirror-image halves; unequally developed on the opposite sides of an axis. Opposite of symmetrical. | |
| Attenuate | Tapering very gradually to a narrow tip. |  |
| Auricle | An ear-shaped appendage; for example, on the lip of an orchid or at the apex of the leaf sheath of Poaceae; also used for appendices not so ear-shaped, for example the appendices arising at the junction between the claw and the blade of clawed petals. |  |
| Auriculate (auricled) | Referring to an organ or structure, such as a leaf blade, with earlike lobes, which usually are situated at the base. |  |
| Awn | A bristle or hairlike appendage; e.g., the terminal extension of the midvein of the glume, palea, or lemma in the Poaceae. |  |
| Axil | An angle formed at the junction of two structures; e.g., the petiole of the leaf and the stem, or a secondary vein of a leaf and the midrib. | |
| Axile | Relating or belonging to the axis of a structure. | |
| Axillary | Arising from an axil; for example, an axillary bud arising in the axil between the stem and the petiole. |  |
| Barbate (diminutive = barbellate) | Bearded or tufted with hairs. |  |
| Barbed | Bearded or tufted with hairs, e.g., the lower petal lobe of |
|
| Basal | Toward the base. Opposite of apical. Same as proximal. | |
| Base | The bottom or proximal end of a structure such as a stem, leaf blade or flower. | |
| Basifixed | Attached at the bottom or the base; e.g., the anthers of many plants. |  |
| Basipetalous | Developing from the apex toward the base. Opposite of acropetalous. | |
| Basiscopic | Facing or directed toward the base. Opposite of acroscopic. | |
| Basitonic | Referring to a type of branching in which the shoots nearest the base of the stem show the greatest development, as in the inflorescences of Hydrangeaceae. | |
| Beak | A narrow or prolonged tip; often used to describe the apices of fruits or seeds. |