Flora of North America species comparison

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Calystegia soldanella

Calystegia spithamaea

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

low false bindweed, upright false bindweed
Habit Perennials, rhizomatous. Perennials, rhizomatous.
Herbage

glabrous.

glabrate or tomentose, hairs sometimes whitish.
Stems

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

erect, 10–35(–50) cm.
Leaves

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

blade narrowly to broadly elliptic, to 80 × 35 mm, base cuneate, rounded, or lobed, lobes rounded or ± 1-pointed, to 11 mm.
Bracts

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

immediately subtending sepals, lance-ovate, oblong, or oval, (13–)16–25(–29) × 8–14(–20) mm, proximally flat or ± keeled, apex acute to obtuse, closely enfolding sepals.
Flowers

sepals 10–16 mm;

corolla pink, 32–52 mm.

sepals 12–17 mm;

corolla white, 35–63(–67) mm.
2n

= 22 [Asia, Europe].

Calystegia soldanella

Calystegia spithamaea
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
e North America; c North America
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Habit ± lax; herbage glabrate to pubescent; leaf blades ultimately ± flat.
subsp. spithamaea
1. Habit ± compact; herbage tomentose, hairs sometimes whitish; leaf blades ± conduplicate.
→ 2
2. Leaf blade bases usually lobed, lobes to 5(–6) mm, sometimes cuneate; corollas (38–)43–59(–64) mm; plants (10–)15–35(–40 cm).
subsp. stans
2. Leaf blade bases lobed, lobes 4–11 mm; corollas 35–47(–53) mm; plants (15–)25–35(–40) cm.
subsp. purshiana
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. macrostegia, C. malacophylla, C. occidentalis, C. peirsonii, C. pubescens, C. purpurata, C. sepium, C. silvatica, C. soldanella, C. stebbinsii, C. subacaulis, C. vanzuukiae
Subordinate taxa
C. spithamaea subsp. purshiana, C. spithamaea subsp. spithamaea, C. spithamaea subsp. stans
Synonyms Convolvulus soldanella Convolvulus spithamaeus
Name authority (Linnaeus) R. Brown: Prodr., 484. (1810) (Linnaeus) Pursh: Fl. Amer. Sept. 1: 143. (1813)
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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