Thelypodium integrifolium subsp. longicarpum
Contr. Gray Herb. 204: 111. 1973.
Racemes (moderately to strongly congested), not elongated in fruit; central rachis (4.3–)8–20 cm. Fruiting pedicels usually horizontal to reflexed, rarely divaricate, straight, whitish, stout, (6–)7–11(–13) mm, strongly flattened at base. Flowers: petals white, (7.5–)8–11(–13) mm; gynophore stout, (1–)1.5–4(–5.5) mm. Fruits usually horizontal to reflexed, rarely divaricate, straight or incurved to arcuate, (2.2–)3.5–6.5(–8) cm.
Phenology: Flowering Aug–Oct.
Habitat: Canyons, shrub communities
Elevation: 500-1300 m
Of conservation concern.
Subspecies longicarpum is known from the Grand Canyon National Park and adjacent canyons of the Colorado River.