The fused, single duct that joins the ducts of the paired ventrolateral foregut glands in Dondersia is found in other Solenogastres genera with monostichous and polystichous
radulae (Nierstrasz, 1905; Scheltema et al.
1 mm width, deciduous; terciary branches numerous; flowers numerous per branch, polystichous
, rotate to slightly campanulate, ca.
Aiphanes lindeniana is a solitary palm with polystichous
leaves that have 18-31 narrowly cuneate pinnae per side, these with the margins usually spineless; A.
1 cm in diameter, scape bracts polystichous
, imbricate, rose-coloured, the lower foliaceous, the blades similar to the leaves, the upper bladeless or with much reduced blades, linear-subulate, the sheaths ovate, to 5 cm long and 3 cm wide, concealing the scape; spike erect, narrowly elliptic to oblong, 18-25 cm long, 3.
Floral scales polystichous
, divergent, falling before the achenes, 1.
5-5 cm long, basal bracts of the scape polystichous
, narrowly triangular, acute and acuminate, 4.
Within the Tillandsioideae subfamily, they have been distinguished by a suite of characters including a usually polystichous
arrangement of flowers, and joined (fused or conglutinated) petals which are white, cream, green, and yellow to orange (never blue