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5. Calystegia stebbinsii Brummitt, Kew Bull. 29: 499, fig. 1. 1974.
[C E]
Perennials, underground stems ± woody. Herbage hairy, hairs appressed or spreading, whitish. Stems trailing or twining-climbing, to 100 cm. Leaves: blade palmately 7–9-lobed, lobes linear to linear-oblong, to 55 × 6 mm, base ± truncate. Bracts to 18 mm distant from sepals, margins palmately 3–7(–9)-lobed, lobes to 18 × 3 mm. Flowers: sepals 7–11 mm, basally glabrous or hairy; corolla cream, yellow, or pink-striped, 30–35 mm.
Flowering Apr–Jul. Chaparral, foothills; of conservation concern; 300–700 m; Calif.
Calystegia stebbinsii is notable for having no intermediates or hybrids with any other species or any significant infraspecific variants. In some characters, it is similar to C. vanzuukiae; they grow in similar habitats.
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