Flora of North America species comparison

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Calystegia soldanella

Calystegia macrostegia

beach bindweed, beach false bindweed, beach morning-glory, coast morning-glory, seashore false bindweed, seaside morning-glory

island false bindweed, island morning glory
Habit Perennials, rhizomatous. Perennials or subshrubs, rootstock woody.
Herbage

glabrous.

glabrescent, glabrous, or ± hairy, including puberulent and/or pubescent.
Stems

usually prostrate or trailing, sometimes twining-climbing, to 100(–250) cm.

prostrate, weakly trailing, or twining-climbing, to 100 cm, or strongly twining-climbing, to 900+ cm.
Leaves

blade ± reniform, 15–35(–45) × 20–60(–70) mm, ± fleshy), base ± cuneate, apex emarginate or obtuse.

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, ovate to suborbiculate, 7–16 × 5–10 mm, proximally flat, ± enfolding sepals.

immediately subtending sepals, lanceolate to ovate or suborbiculate, (6–)8–30(–37) × 4–30 mm, proximally flat, keeled, or saccate.
Flowers

sepals 10–16 mm;

corolla pink, 32–52 mm.

sepals 7–25 mm;

corolla white or cream, sometimes fading pink to purplish, 22–68 mm.
2n

= 22 [Asia, Europe].

Calystegia soldanella

Calystegia macrostegia
Phenology Flowering May–Aug.
Habitat Open, sandy shores.
Elevation 0(–10) m. (0(–0) ft.)
Distribution
from FNA
CA; OR; VA; WA; BC; South America; w Europe; Asia; Africa; Atlantic Islands (Canary Islands, Tristan da Cunha); Pacific Islands (Galapagos, New Zealand); Australia
[WildflowerSearch map]
[BONAP county map]
from USDA
n Mexico; California
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 6 (6 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Bracts 16–30 mm wide, proximally keeled or saccate.
→ 2
2. Bracts 13–23(–26); sepals 10–17(–22) mm; corollas 36–55(–60) mm; stamens 17–26 mm.
subsp. macrostegia
2. Bracts (19–)22–30(–37); sepals 16–25 mm; corollas 47–68 mm; stamens 23–32 mm.
subsp. amplissima
1. Bracts 4–16 mm wide, proximally flat, keeled, or ± saccate.
→ 3
3. Bract apices acuminate, emarginate, or obtuse.
subsp. cyclostegia
3. Bract apices acute.
→ 4
4. Herbage ± grayish pubescent.
subsp. arida
4. Herbage glabrous or puberulent, usually glabrescent.
→ 5
5. Leaf blades broadly to narrowly tri­angular, (7–)12–20(–30) mm wide excluding lobes.
subsp. intermedia
5. Leaf blades linear to narrowly tri­angular, 1–7 mm wide excluding lobes.
subsp. tenuifolia
Source FNA vol. 14. FNA vol. 14.
Parent taxa Convolvulaceae > Calystegia Convolvulaceae > Calystegia
Sibling taxa
C. atriplicifolia, C. catesbeiana, C. collina, C. felix, C. hederacea, C. longipes, C. macounii, C. macrostegia, C. malacophylla, C. occidentalis, C. peirsonii, C. pubescens, C. purpurata, C. sepium, C. silvatica, C. spithamaea, C. stebbinsii, C. subacaulis, C. vanzuukiae
C. atriplicifolia, C. catesbeiana, C. collina, C. felix, C. hederacea, C. longipes, C. macounii, C. malacophylla, C. occidentalis, C. peirsonii, C. pubescens, C. purpurata, C. sepium, C. silvatica, C. soldanella, C. spithamaea, C. stebbinsii, C. subacaulis, C. vanzuukiae
Subordinate taxa
C. macrostegia subsp. amplissima, C. macrostegia subsp. arida, C. macrostegia subsp. cyclostegia, C. macrostegia subsp. intermedia, C. macrostegia subsp. macrostegia, C. macrostegia subsp. tenuifolia
Synonyms Convolvulus soldanella Convolvulus macrostegius
Name authority (Linnaeus) R. Brown: Prodr., 484. (1810) (Greene) Brummitt: Ann. Missouri Bot. Gard. 52: 214. (1965)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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