The Manual of the Botany of the Northern United States / Including the District East of the Mississippi and North of North Carolina and Tennessee

by Asa Gray

Achene. A small, dry and hard, 1-celled, 1-seeded, indehiscent fruit.

Achlamydeous. Without calyx or corolla.

Acicular. Slender needle-shaped.

Acrogenous. Growing from the apex by a terminal bud or by the apical cell only.

Aculeate. Prickly, beset with prickles.

Aculeolate. Beset with diminutive prickles.

Acuminate. Tapering at the end.

Acute. Terminating with a sharp or well-defined angle.

Æstivation. The arrangement of the parts of the perianth in the bud.

Adnate. United, as the inferior ovary with the calyx-tube. Adnate anther, one attached for its whole length to the inner or outer face of the filament.