Sisymbrium altissimum tumble mustard Brassicaceae SIAL2*; Bx, pb; Q, j; K, p; R;


Sisymbrium altissimum.Bobby

Sisymbrium altissimum.Bobby (Accessed 4/2014).

Sisymbrium altissimum is an annual herb or winter annual, to 1 m tall, from a rosette, stems much branched above. 

Leaves alternate, early or overwintering rosette leaves with wide-based regular segments, stem leaves pinnately divided with 5-8 long, lobes linear to narrow, toothed or entire, upper leaves smaller with fewer, filament-like lobes. 

Flowers pale yellow, 4 petals, to 0.8 cm long, blooming at the top of a raceme with developing fruit below, self fertile (autogamous), (Mulligan and Kevan 1973); blooming June-Sept. 

Fruit dry, capsule, to 1 cm long, 0.1 cm wide. 

Wetland status: FACU-. 

Frequency in NYC: Very infrequent.

 Origin: Eurasia. 

Habitat: Open areas. Agricultural weed. 

NotesSisymbrium species are host to the larvae of the falcate orangetip butterfly, Anthocharis midea (Pieridae).