Opuntia engelmannii var. flexispina
Madroño 35: 348. 1988.
Stem segments ovate to subcircular, 20–35 × 15–30 cm, to 1.5 times longer than wide. Spines (0–) 1–5 per areole, evenly distributed on stem segments, deflexed sharply (not arching) or recurving laterally, yellow, sometimes with brown basal portions, flexible, the longest 50–80 mm.
Phenology: Flowering spring.
Habitat: Rangelands, on hills
Elevation: 100-200 m
Of conservation concern.
Opuntia engelmannii var. flexispina is recognized here reluctantly because it is so poorly known; more study is required to assess its status. Its distribution is limited to Webb and Zapata counties, Texas, according to D. Weniger (1970).