Convolvulus luteolus A. Gray var. fulcratus A. Gray, Proc. Amer. Acad. Arts 11: 90. 1876; Calystegia fulcrata (A. Gray) Brummitt; C. malacophylla (Greene) Munz var. deltoidea (Greene) Munz; Convolvulus fulcratus (A. Gray) Greene; C. fulcratus var. deltoideus (Greene) Jepson

Peduncles 1-flowered. Bracts 2–12(–15) mm distant from sepals, narrowly lanceolate to broadly triangular, 5–22(–30) × 2–4(–7) mm, margins proximally lobed or toothed.

Flowering May–Jul(–Aug). Dry slopes, rocky, shrubby sites, usually on serpentine; 30–2500 m; Calif.