Subularieae DC., Mem . Mus. Hist. Nat. 7(1): 257. 20 Apr 1821. (2: 3), 1913

German, Dmitry A., Hendriks, Kasper P., Koch, Marcus A., Lens, Frederic, Lysak, Martin A., Bailey, C. Donovan, Mummenhoff, Klaus & Al-Shehbaz, Ihsan A., 2023, An updated classification of the Brassicaceae (Cruciferae), PhytoKeys 220, pp. 127-144 : 127

Subularieae DC., Mem. Mus. Hist. Nat. 7(1): 257. 20 Apr 1821. (2: 3)

Type.

Subularia L.

Description.

Herbs scapose annuals. Trichomes absent. Multicellular glands absent. All leaves in a basal rosette, sessile or petiolate, cauline leaves absent. Racemes ebracteate throughout and elongated or not in fruit, or flowers solitary on long pedicels originating from center of rosette. Flowers actinomorphic; sepals spreading or ascending, base of lateral pair not saccate; petals white, claw obscure or undifferentiated from blade; filaments slender at base; pollen 3-colpate; ovules 4-18. Fruits dehiscent, unsegmented silicles, orbicular and strongly latiseptate or obovoid to ellipsoid and slightly angustiseptate; septum complete; styles minute or absent; stigma entire. Seeds biseriate, broadly winged and accumbent, or wingless and incumbent. x = 14 and 15.

Distribution.

The tribe includes monospecific Idahoa (NW USA and Canadian British Columbia) and two aquatic or littoral species of Subularia , of which S. monticola A. Braun ex Schweinf. is restricted to tropical East Africa, and S. aquatica L. is distributed in northern North America (subsp. Subularia aquatica americana G.A. Mulligan & Calder) and temperate Eurasia (subsp. Subularia aquatica aquatica ).

3f. Schrenkiella

This monospecific genus was based on Diplotaxis parvula Schrenk, a species that fluctuated between unrelated genera solely on morphological grounds. It was first shown by German et al. (2009) to occupy an isolated position among Asian Brassicaceae and was subsequently recognized by German and Al-Shehbaz (2010) as a monospecific genus that was not placed in any tribe. It was shown by Huang et al. (2016) to form a basal clade to that including Sisymbrium L. and six genera of the Brassiceae . The first robust position of Schrenkiella was shown by Walden et al. (2020) and fully supported by Hendriks et al. (2022). It is sister to a clade including the Fourraeeae and sister clade including the Brassiceae and Isatideae plus Sisymbrieae and Thelypodieae . The isolated position of monophyletic Schrenkiella strongly supports its placement in its own tribe.