Arabidopsideae Al-Shehbaz, Hendriks, M.Koch, F.Lens, Lysak, C.D.Bailey, Mumm. & D.A.German, trib. nov. (1: 18)

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

Arabidopsideae Al-Shehbaz, Hendriks, M.Koch, F.Lens, Lysak, C.D.Bailey, Mumm. & D.A.German, trib. nov. (1: 18)

Type.

Arabidopsis (DC.) Heynh.

Description.

Herbs, annual or perennial. Trichomes simple, mixed with stalked 1-3(or 4)-forked. Multicellular glands absent. Cauline leaves petiolate to subsessile and cuneate to attenuate at base, not auriculate. Racemes ebracteate, often elongated in fruit. Flowers actinomorphic; sepals ascending to spreading, base of lateral pair slightly saccate or not; petals white, pink, or purple; claw obscurely differentiated from blade or distinct; filaments unappendaged, wingless; pollen 3-colpate; ovules 15-80 per ovary. Fruits siliques, linear, terete or latiseptate, unsegmented; styles obsolete or to 1 mm long; stigma entire. Seeds uniseriate; cotyledons accumbent or rarely incumbent. x = 5 and 8.

Distribution.

Eurasia, Africa, North America.

Notes.

Arabidopsideae is distinguished from the Camelineae by the lack of stellate and dendritic trichomes, though both also have simple and stalked forked trichomes, by having petiolate or subsessile cauline leaves not auriculate at base, by the lack of yellow flowers, 15-80 ovules per ovary, silique fruits, and accumbent or rarely incumbent cotyledons. By contrast, the Camelineae usually have some stellate or dendritic trichomes, always sessile and auriculate to sagittate cauline leaves, usually yellow flowers, though white to pink flowers occur just as in the Arabidopsideae , 2-40 ovules per ovary, silicle or rarely silique fruits, and incumbent or rarely accumbent cotyledons.

3b. Asperuginoides

There has been no agreement among various authors about the tribal assignment of monospecific Asperuginoides Rauschert. For example, Khosravi et al. (2009) indicated a close relationship to the Cochlearieae , whereas German et al. (2009) and Warwick et al. (2010) showed no affinity to any tribe. It was listed as an unplaced genus by Al-Shehbaz (2012). More recently, Nikolov et al. (2019) and Hendriks et al. (2022) identified a sister relationship to the Alysseae , but Španiel et al. (2015) excluded it from the tribe. Furthermore, the plastome data by Walden et al. (2020) did not support that nor indicated any relationship to the 50+ tribes. Given the current data, it appears that the best solution is to place this anomalous genus in its own tribe.