Leaves glabrous, usually erect, thinner than in A. foliolosa, usually 7-20 cm by 1-3 mm; veins 3, well-spaced. Peduncles 25-60 cm, glandular pubescent at least in the upper part, rigid, with 6-15 narrow-lanceolate sterile bracts to 5 cm long; fertile bracts 30-70, lanceolate, 3-8 mm long; bracteoles similar to the bracts but shorter; pedicels 0-1 mm, not greatly elongating in fruit, rather abruptly expanding to the base of the ovary. Perianth segments white, sometimes pink towards the tip, glandular pubescent, connate to one-third of their length, arising near the apex of the ovary, oblong, subacute, 2.5-3 by c. 1 mm. Anthers orange, to c. ½ mm long, subsessile, attached near middle of perianth. Ovary c. 2 mm long, oblong to obovoid; style c. 1 mm, minutely 3-lobed. Capsule obovoid, 5 mm long.
A perennial plant 30 cm high. There are many leaves tufted together. They are very narrow. They are 5-30 cm long by 2-4 mm wide. The flowering stalk is 5-35 cm long and has 10-80 flowers in a loose cluster. This stalk is densely hairy. The flowers can be yellow or white. They can be striped or tinged pink. The fruit is a capsule which is oval and angular. It is 3-5 mm long by 2-3 mm wide.