Calystegia macrostegia in Flora of North America @ efloras.org

13. Calystegia macrostegia (Greene) Brummitt, Ann. Missouri Bot. Gard. 52: 214. 1965.

Convolvulus macrostegius Greene, Bull. Calif. Acad. Sci. 1: 208, 226. 1885

Perennials or subshrubs, rootstock woody. Herbage glabrescent, glabrous, or ± hairy, including puberulent and/or pubescent. Stems prostrate, weakly trailing, or twining-climbing, to 100 cm, or strongly twining-climbing, to 900+ cm. Leaves: blade linear or broadly to narrowly triangular, to 130 × 1–120 mm, basally lobed, lobes 2–3-pointed or rounded, basal sinus acute, rounded, or ± quadrate. Bracts immediately subtending sepals, lanceolate to ovate or suborbiculate, (6–)8–30(–37) × 4–30 mm, proximally flat, keeled, or saccate. Flowers: sepals 7–25 mm; corolla white or cream, sometimes fading pink to purplish, 22–68 mm.

Subspecies 6 (6 in the flora): California, n Mexico.

1 Bracts 16–30 mm wide, proximally keeled or saccate. (2)

+ Bracts 4–16 mm wide, proximally flat, keeled, or ± saccate. (3)

2 (1) Bracts 13–23(–26); sepals 10–17(–22) mm; corollas 36–55(–60) mm; stamens 17–26 mm 13a Calystegia macrostegia subsp. macrostegia

+ Bracts (19–)22–30(–37); sepals 16–25 mm; corollas 47–68 mm; stamens 23–32 mm 13b Calystegia macrostegia subsp. amplissima

3 (1) Bract apices acuminate, emarginate, or obtuse 13c Calystegia macrostegia subsp. cyclostegia

+ Bract apices acute. (4)

4 (3) Herbage ± grayish pubescent 13d Calystegia macrostegia subsp. arida

+ Herbage glabrous or puberulent, usually glabrescent. (5)

5 (4) Leaf blades broadly to narrowly triangular, (7–)12–20(–30) mm wide excluding lobes 13e Calystegia macrostegia subsp. intermedia

+ Leaf blades linear to narrowly triangular, 1–7 mm wide excluding lobes 13f Calystegia macrostegia subsp. tenuifolia

Lower Taxa

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