53. Hornungia Reichenbach in H. G. L. Reichenbach et al., Deutschl. Fl. 1: 33. 1837.
[For Ernst Gottfried Hornung, 1795-1862, German pharmacist in Schwarzburg]
Ihsan A. Al-Shehbaz
Hutchinsia W. T. Aiton; Hutchinsiella O. E. Schulz; Hymenolobus Nuttall; Microcardamum O. E. Schulz; Pritzelago Kuntze
Annuals [perennials]; [caudex branched]; not scapose; glabrous or puberulent, trichomes minutely branched and subsessile, mixed with simple ones. Stems erect, ascending, or decumbent [procumbent], branched or, rarely, unbranched. Leaves basal and cauline [or cauline absent]; petiolate or subsessile; basal rosulate or not, petiolate, blade margins entire, dentate, or pinnatisect; cauline petiolate or subsessile, blade margins pinnatisect, pinnatifid, dentate, or entire. Racemes (corymbose), elongated or not in fruit. Fruiting pedicels divaricate, slender. Flowers: sepals spreading or reflexed, ovate [or oblong], (glabrous or puberulent); petals white, spatulate, [obovate, oblong, or oblanceolate], (longer or shorter than sepals), claw absent, (apex obtuse or rounded); stamens (rarely 4), subtetradynamous; filaments often dilated basally; anthers ovate, (apex obtuse); nectar glands lateral, 1 on each side of lateral stamen, median glands present or absent. Fruits silicles, sessile, oblong, elliptic, obovoid [ovoid, suborbicular, lanceoloid], keeled, angustiseptate; valves each with prominent midvein, glabrous; replum rounded; septum complete; ovules [4-]10-24 per ovary; style usually obsolete (rarely to 0.5 mm); stigma capitate. Seeds biseriate or aseriate, plump, not winged, oblong; seed coat (obscurely reticulate) mucilaginous or not when wetted; cotyledons incumbent, rarely accumbent. x = 6.
Species 3 (1 in the flora): introduced; Europe, Asia, n Africa; introduced also in Mexico, South America, s Africa, Australia.
SELECTED REFERENCE Appel, O. and I. A. Al-Shehbaz. 1998. Generic limits and taxonomy of Hornungia, Pritzelago, and Hymenolobus (Brassicaceae). Novon 7: 338-340.
