| acuminate | tapering gradually or abruptly to a narrow tip, with sides inwardly curved or concave. |
| acute | sharply pointed. |
| anther | that part of stamen containing pollen. |
| appressed | (of hair), lying close to surface and thus flattened. |
| areole | a space on a surface marked out by lines, cracks or ridges. |
| axillary | arising from upper angle between a stem and a leaf or similar organ arising from the stem. |
| bipinnate | when the pinnae of a compound pinnate leaf are again pinnate, the leaf thus being twice pinnate. |
| bole | the lower usually undivided part of a tree trunk. |
| branchlet | a small, ultimate division of a branch. |
| calyx | the outer envelope of the flower composed of sepals. |
| ciliolate | with a fringe of very small hairs along edge. |
| compressed | (of pods), flattened lengthwise. |
| connate | (of stamen-filaments), united among themselves into a tube, wholly or partially. |
| corolla | the inner envelope of the flower, composed of petals. |
| crenate | notched on margin with shallow, blunt or rounded teeth. |
| dehiscent | (of pods), opening when ripe spontaneously along margins; hence, to dehisce. |
| eglandular | without glands. |
| falcate | curved like a scythe or sickle. |
| filament | the stalk of a stamen supporting the anther. |
| glabrous | without hairs. |
| glabrescent | becoming glabrous, or nearly so. |
| gland | various sorts of gland occur in Acacia; those mentioned in this report are either on the leaf-axes (petiole or rhachis) where they appear like small round disc-cups or warts on the surface (they are secretory when very young); or on the pods where they are small often coloured secretory organs borne on hairs mixed with other eglandular hairs. |
| glandular | possessing glands. |
| indehiscent | not opening spontaneously when ripe. |
| indumentum | hair-covering. |
| inflorescence | the arrangement of flowers on a plant, in Acacia either a round head or a spike. |
| inflorescence-axis | here used for the stalk along which the flowers in the spike are arranged. |
| leaflet | the leafy divisions of a compound leaf. |
| morphological | related to the appearance of external form and features. |
| obtuse | blunt or rounded at end. |
| peduncle | here used for the stalk bearing the head or spike of flowers. |
| petiole | the stalk of a leaf, here the stalk below the lowest pair of pinnae. |
| pinna | (plural pinnae), the primary division of a compound leaf, here an axis bearing leaflets. |
| prickle | here used for the short sharp outgrowths from the branchlets or twigs of certain acacias, in the species dealt with here always in groups of three or (occasionally) solitary (see spine). |
| polyad | where served individual pollen grains remain (and are dispersed) fused into a compound structure or polyad. |
| puberulous | shortly and minutely pubescent. |
| pubescent | downy with short, soft hairs. |
| rhachis | (plural rhachides), here used for the axis of the compound leaves along which the pinnae or leaflets are arranged. |
| rostrate | beaked |
| spicate | arranged in a spike. |
| spike | an elongate inflorescence with the flowers borne directly on the axis of the inflorescence. |
| spine | here used for the sharp-pointed, rigid, often elongate structures borne in pairs along the branchlets and twigs; in Acacia these spines are derived from modified stipules. |
| stamen | one of the male organs of the flowers, consisting of a filament and anther; in Acacia there are numerous stamens in each flower. |
| stipular | stipule-like, or originating as a stipule. |
| stipule | leaf-like or scale-like appendages of the leaf, usually one on either side of the base of the petiole, in Acacia often becoming spinous. |
| subglabrous | nearly glabrous. |
| subspecies | the major taxonomic division of a species, above variety. |
| taxonomy | natural, orderly classification. |
| tectum | an external layer of the wall of the pollen-grain. |
| tomentellous | shortly tomentose. |
| tomentose | densely clothed with short soft, curved curled or matted hairs, denser than pubescent (q.v.). |
| variety | a lesser taxonomic division of a species, below subspecies. |
