Description: Glabrous, glaucous annual with single stem highly branched above, 4-10 dm tall; lower leaves entire or rarely denticulate, up to 6 cm long and rarely to 1.5 cm wide; upper leaves lanceolate to narrowly linear; inflorescences few-flowered, terminating slender branches; petals white, 3-3.5 mm long; fruiting pedicels slender, spreading at right-angles or slightly ascending, 8-11 mm long; siliques erect, torulose, 1.5-2.5 cm long.
Distribution: Northern to central New Mexico (Rollins 1993); mostly from the north-central to the south-central parts (Martin and Hutchins 1980).
Plants Seen or Cited: New Mexico, Mora Co., 100 m from Pecos River, 9460', Jul 1982, Andrews C9 187 (UNM); Otero Co., Road to Sacramento Peak near head of Rice Canyon, T17S R11E S23, ca 9000', 14 Jul 1977, Fletcher 2336A (UNM); 5.9 mi SW of Mayhill,, 13 Aug 1949, Gordon & Norris 570 (UNM); 17.2 mi SW of Mayhill, 13 Jul 1949, Gordon & Norris 600 (UNM); Lincoln Natl. Forest, Benson Ridge, 14 Aug 1990, Pase 3533 (NMC); 2.3 mi S of junction of NM Hwy 130 with Hwy 24, 8 Sep 1979, Soreng & Spellenberg 605 (NMC); 1 mi down Silver Spring Canyon from Mescalero Reservaton Boundry, 18 Jul 1976, Todsen sn (NMC); Sacramento Mts., Hubbel Spring, T17S R12E S32, 12 Jul 1978, WHP 907 (UNM); Cloudcroft, 24 Aug 1901, Wooton sn (NMC); Mescalero Reservation, 21 Jul 1905, Wooton sn (NMC); James Canyon, 5 Aug 1905, Wooton sn (NMC); Rice Canyon (T17S R11E S14), 28 Jul 1979, Worthington 4809 (UTEP); Nelson Vista Trail (T16S R11E S13), 18 Aug 1984, Worthington 12330 (UTEP); San Miguel Co., Pecos, Jul 1904, Bartlett sn (NMC); Pecos, Sep 1904, Bartlett sn (NMC); Headwaters of Pecos River, Aug 1905, Bartlett sn (NMC); Vicinity Jack's Creek, 1.5 mi N of Cowles, 13 Jul 1981, Hutchins 9745 (NMC); Upper Pecos River, 21 Jul 1898, Maltby & Cayhill 88 (NMC); Winsor's Ranch, 8400', 3 Aug 1908, Standley 4741 (NMC); near Pecos, 18 Aug 1908, Standley 5033 (NMC);
Habitat: Canyon, mixed pine forest, open wooded slopes (Rollins 1993); 7000-9000' (Martin and Hutchins 1980); forest openings, 9600' (Pase 3533); along road in yellow pine woods (Soreng & Spellenberg 605); gravel and clay loam of forest area, ca. 8200' (Hutchins 9745); yello pine on canyon slopes (Gordon & Norris 570); white fir, doug fir, yellow pine, 9000' (Gordon & Norris 600)
Comments: In Wooton and Standley (1915) and Martin and Hutchins (1980) this is treated as Sisymbrium vaseyi S. Wats. Various authors indicate that the species is restricted to the mountains of New Mexico, but none indicate it is rare. As a state endemic, it was apparently overlooked in the preparation of a handbook on rare and endemic plants of the state (New Mexico Native Plant Protection Advisory Committee 1983). The plant is annual, and as such can be expected to positively respond to minor disturbance within its habitat, as perhaps indicated by label data on Soreng & Spellenberg 605. The species is not recorded in Henrickson and Johnston (1997).
Status: Endemic to New Mexico; apparently occuring in two major sites, the Sacramento Mts. in the south and around the Pecos River in the north.
Henrickson, J., and M.C. Johnston. 1997. A flora of the Chihuahuan Desert region. Privately published proof copy, J. Henrickson, Los Angeles. 1687 pp.
Martin, W.C., and C.R. Hutchins. 1980. A Flora of New Mexico, vol. 1. J. Cramer, Vaduz. Pp. 1-1276.
New Mexico Native Plant Protection Advisory Committee. 1983. A handbook of rare and endemic plants of New Mexico. Univ. of New Mexico Press, Albuquerque. 291 pp.
Rollins, R.C. 1993. The Cruciferae of Continental North America. Stanford University Press, Stanford. 976 pp.
Wooton, E.O., and P.C. Standley. 1915. Flora of New Mexico. Contr. U. S. Natl. Herbarium 19: 1-794.
Information Compiled By: Richard Spellenberg, 1998