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fine-leaf tansy-mustard, fixweed, flixweed, flixweed tansymustard, herb sophia, not much flower, tansy mustard

Habit Annuals; eglandular; sparsely to densely pubescent, sometimes glabrous distally, trichomes dendritic.

erect, unbranched or branched distally, (1–)2–7(–10) dm.

Basal leaves

petiole 0.1–2(–3) cm;

blade 2- or 3-pinnate, ovate or oblong to obovate in outline, to 15 cm, lateral lobes linear or oblong, (to 10 × 2 mm), margins entire.

Cauline leaves

sessile or shortly petiolate;

blade smaller distally, distal lobes often narrower, surfaces often glabrous.


considerably elongated in fruit.


sepals erect to ascending, yellowish, oblong, 1.8–2.8 mm, glabrate to sparsely pubescent;

petals narrowly oblanceolate, 2–3 × 0.4–0.6 mm;

median filaments 2–3 mm;

anthers 0.3–0.4 mm.

Fruiting pedicels

divaricate to ascending, straight, (5–)8–15(–20) mm.


divaricate-ascending to erect, narrowly linear, torulose, (12–)15–27(–30) × 0.5–0.8(–1) mm, (straight or curved upward);

valves each with distinct midvein;

septum with a broad central longitudinal band appearing as 2 or 3 veins;

ovules 20–48 per ovary;

style obsolete, 0.05–0.2 mm, glabrous.


uniseriate, reddish brown, oblong, 0.7–1.3 × 0.3–0.6 mm.


= 28.

Descurainia sophia

Phenology Flowering Mar–Jul.
Habitat Roadsides, waste places, disturbed sites, railroad embankments, hillsides, mountain slopes, canyon bottoms, stream banks, fields, lawns, pastures, deserts, sagebrush and pinyon-juniper communities
Elevation 0-3000 m (0-9800 ft)
from FNA
AK; AR; AZ; CA; CO; CT; DC; DE; GA; IA; ID; IL; IN; KS; KY; LA; MA; ME; MI; MN; MO; MT; NC; ND; NE; NH; NM; NV; NY; OK; OR; PA; RI; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; ON; PE; QC; SK; YT; Eurasia [Introduced in North America; introduced also in Mexico, Central America, South America, South Africa, Australia]
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[BONAP county map]

Deviant chromosome counts (e.g., 2n = 12, 14, 20, 38; see R. C. Rollins 1993, N. H. Holmgren 2005b, S. I. Warwick and I. A. Al-Shehbaz 2006) are most certainly erroneous, and the species appears to be exclusively tetraploid based on x = 7.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 7, p. 528.
Parent taxa Brassicaceae > tribe Descurainieae > Descurainia
Sibling taxa
D. adenophora, D. brevisiliqua, D. californica, D. incana, D. incisa, D. kenheilii, D. longepedicellata, D. nelsonii, D. obtusa, D. paradisa, D. pinnata, D. sophioides, D. torulosa
Synonyms Sisymbrium sophia, Hesperis sophia, Sisymbrium parviflorum, Sophia parviflora
Name authority (Linnaeus) Webb ex Prantl: in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 55(III,2): 192. (1891)
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