Cardamine macrocarpa Brandegee, Zoe 5: 233. 1906. TYPE:

Cardamine macrocarpa var. texana Rollins, J. Arnold Arbor. 21: 394. 1940. TYPE: United States, Texas, Brewster Co., Camp Mountain, Chisos Mountains, Sep 1933, V. L. Cory 7141 (holotype, GH!).

Herbs, annual, glabrous or sparsely puberulent. Rhizomes absent; stolons absent. Stems (1.4–)2–4.5(5.3) dm, erect, or decumbent, 1to or several from base, simple or often branched above, flexuous or straight, narrowly winged-angled. Basal leaves not rosulate, soon withered; cauline leaves 3–9, middle ones 5–9-foliolate, 3–8 cm; petiole 1–3 cm, base not auriculate; terminal leaflet broadly ovate to narrowly lanceolte or rarely oblong, 0.7–2 × 0.2–1 cm, base cuneate to rounded, margin repand, crenate, or 3-lobed, petiolute 2–8 mm; lateral lobes similar to terminal, often smaller and with oblique base, upper leaves gradually reduced in size and with narrower, subsessile leaflets. Racemes ebracteate; rachis slightly to strongly flexuous or geniculate; fruiting pedicels horizontal to divaricate or ascending, (3–)4–9(–12) mm. Sepals oblong, 2–3.5 × 0.7–1.2 mm, base of lateral pair not saccate; petals white, linear, 6–8 × 0.7–1 mm; median filament pairs 4–5 mm, lateral pair 3.5–4 mm; anthers oblong, 0.7–1 mm. Fruit linear, (2.5–)3–4.6 cm × 1.7–2.1 mm; valves glabrous; style 1–3 mm; ovules and seeds 14–22 per fruit. Seeds dark brown, oblong, 2–2.5 × 0.9–1.2 mm.

Flowering: Mar–Sep.

Habitat: rock crevices and ledges, gravel bars of mountain streams, moist rocky stream banks, shaded loamy forest floor.

Distribuion: Mexico (Coahuila, Nuevo Leon), United States (Texas/Brewster Co.).