8. Thelypodium laxiflorum Al-Shehbaz, Contr. Gray Herb. 204: 129. 1973. TYPE: United States, Colorado, Garfield Co., ca. 2 miles E of Glenwood Springs, sandy soil along roadside, 3 June 1969, L. C. Higgins 1487 (holotype, GH!; isotypes, BRY!, MO!, NY!, RM!, US!).

Thelypodium wrightii A. Gray var. tenellum M. E. Jones, Proc. Calif. Acad. Sci. II. 5: 622. 1895 Stanleyella wrightii (A. Gray) Rydberg var. tenella (M. E. Jones) Payson, Ann. Missouri Bot. Gard. 9: 317. 1923. TYPE: United States, Utah, Utah Co., Provo, Slate Canyon, 6000 ft, 2 July 1894, M. E. Jones 5559 (lectotype partially designated by Payson (1923) and fully by Al-Shehbaz (1973) , POM!; isolectotypes, DS!, NY!, RM!, US!).

Herbs, biennial, glabrous throughout or pubescent basally. Stems (1.5–)3–14(–23.5) dm, erect, branched above, glabrous or sparsely to densely hirsute below. Basal leaves and lower cauline ones with petiole (1–)1.7–8(–11) cm, pubescent or glabrous; blade oblanceolate in outline, pinnately lobed or lyrate, (4–)7.2–20.5(–30) x (0.6–)1–4(–10) cm; lateral lobes oblong to linear or rarely deltoid, entire or dentate; middle and upper cauline leaves 1.5–7(–10) × 0.3–1.2(–2) cm, petiolate, lanceolate to linear, sometimes oblanceolate to oblong, entire or repand, rarely lobed. Racemes somewhat lax, corymbose, greatly elongated in fruit; fruiting pedicels divaricate or sometimes reflexed, rarely horizontal or divaricate-ascending, slender, straight, (4–)5–13(–19) mm. Sepals oblong, ascending, (2.5–)3–5(–5.5) x 1–1.7(–3) mm, equal, not saccate; petals white or rarely lavender, spatulate, rarely obovate, 5–7.5(–9.5) x 1.5–2.5(–3.5) mm, obscurely differentiated into blade and claw; median filaments 3–4.5(–5.5) mm, lateral pair 2.5–3.5(–4.5) mm; anthers oblong, (1–)1.5–2.2(–2.5) mm, not circinately coiled, included; nectar glands continuous, flat, subtending bases of all filaments; ovules 26–62 per ovary. Fruits (2–)3–6.6(–7.4) cm x 0.7–1(–1.5) mm, divaricate to reflexed, terete, submoniliform to strongly torulose; gynophore 0.5–0.8(–1.5) mm; style clavate to subclavate or rarely cylindrical, (0.5–)0.8–2(–5) mm. Seeds oblong, (1–)1.3–1.8(–2) x 0.5–1 mm.

Flowering: May–Sep.

Habitat: talus, rocky slopes, cliffs, pinyon-juniper-brush communities.

Elevation: 1500–3050 m.

Distribution: United States (W Colorado, Nevada, Utah).