Physacantheae

Manzitto-Tripp, Erin A., Darbyshire, Iain, Daniel, Lucinda A. McDade Thomas F. & Kiel, Carrie A., 2022, Revised classification of Acanthaceae and worldwide dichotomous keys, TAXON 71 (1), pp. 103-153 : 140

Physacantheae E.Tripp & I.Darbysh. tr. nov.

– Type: Physacanthus Benth.

= Haselhoffiinae Lindau in Engler & Prantl, Nat. Pflanzenfam., Nachtr. 1: 305. 1897 – Type: Haselhoffia Lindau (= Physacanthus ).

Trailing, decumbent or weakly erect herbs, cystoliths absent; leaves opposite but sometimes closely spaced and rosette-forming, often variegated; inflorescences terminal, 1- to several-flowered; calyces cylindrical or inflated, lobes fused for most of their length; corolla white to purple, tube narrowly cylindrical, geniculate at apex, limb subactinomorphic with 5 equal lobes, aestivation left-contort; androecium of 4 stamens with monothecous anthers plus 1 staminode; stigma clavate, 2-lobed; capsule cylindrical, (4–) 6–9-seeded, retinacula present, seeds with papillose processes on the surface; pollen with compound germinal apertures, prolate, 3-colporate with 3 interapertural pseudocolpi.