Asian mustard, more...
[Brassica tournefortii var. sisymbrioides (Fisch.) Grossh.]
densely hirsute proximally, glabrescent distally. Stems
usually branched basally, (widely) branched distally, (1-) 3-7(-10) dm. Basal leaves:
(rosettes persistent); petiole (broad) 2-10 cm; blade lyrate to pinnatisect, 2-30 cm × 10-50 (-100) mm, (margins serrate-dentate), 4-10 lobes each side. Cauline leaves
sessile; blade (reduced in size distally, distalmost bractlike), base tapered, not auriculate or amplexicaul. Racemes
not paniculately branched. Fruiting pedicels
widely spreading, 8-15 mm. Flowers:
sepals 5-4.5 × 1-1.5 mm; petals pale yellow, fading or, sometimes, white, oblanceolate, 4-7 × 1.5-2(-2.5) mm, claw 1-3 mm, apex rounded; filaments 2.5-4 mm; anthers 1-1.3 mm; gynophore to 1 mm. Fruits
(shortly stipitate); widely spreading to ascending (not appressed to rachis), torulose, cylindric, 3-7 cm × 2-4(-5) mm; valvular segment with 6-12(-15) seeds per locule, 2.2-5 cm, terminal segment 1(-3)-seeded, (cylindric, stout), 10-20 mm. Seeds
light reddish brown or black, 1-1.2 mm diam.; seed coat prominently reticulate, mucilaginous when wetted. 2n
= 20. Flowering Feb-Apr. Roadsides, waste places, old fields, washes, open desert areas intermixed with desert shrubs; 0-800 m; introduced; Ariz., Calif., Nev., Tex., Utah; Europe; Asia; Africa; introduced also in nw Mexico, Australia. Brassica tournefortii
was first reported from California (Imperial, Riverside, and western San Bernardino counties) by W. L. Jepson ([1923-1925]), with the first collections appearing from southern California in 1941 (R. C. Rollins and I. A. Al-Shehbaz 1986), Arizona in 1959 (T. H. Kearney and R. H. Peebles 1960), Nevada in 1977, and Texas in 1978 (D. E. Lemke and R. D. Worthington 1991).
Plant: Annual, branched ± from base, widely above; stem < 7 dm; hairs on lower stem ± dense, stiff, white Leaves: basal rosetted, persistent, petioled, pinnately lobed, serrate-dentate; cauline few, base tapered, uppermost bract-like INFLORESCENCE: racemes, terminal; bracts ± 0 Flowers: bisexual; sepals 4, free, erect; petals (0)4, free, yellow, often clawed; stamens generally (2,4)6, generally 4 long, 2 short; ovary 1, superior, chambers generally 2, septum membranous, connecting 2 parietal placentas, style 1, stigma simple or 2-lobed Fruit: capsule, 3-7 cm, cylindric, narrowed between seeds; pedicels spreading, lower 8-15 mm; beak 1-1.5 cm, stout; Seed ± 1 mm wide, many, 1 row per chamber, spheric, finely netted Misc: Roadsides, washes, open areas; < 800 m.; Jan-Jun Notes: fruit beak 1-1.5cm long; pedicels spreading, 8-15mm long; petals clawed References: J.C. Hickman, ed. The Jepson Manual. W.B. McDougal. Seed plants of Northern Arizona. USDA website.ASU specimens.