Flora of North America species comparison

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Calystegia occidentalis

bush morning glory, chaparral false bindweed, pale morning-glory, western morning glory
Habit Perennials or subshrubs, rootstock woody.
Herbage

usually puberulent or pubescent, sometimes glabrescent, rarely tomentellous or ± villous.
Stems

decumbent, procumbent, or twining-climbing, to 400 cm.
Leaves

blade ± triangular, 15–40 mm, base usually lobed, lobes rounded or 1–2-pointed, basal sinus quadrate, rounded and ± parallel-sided, or V-shaped, base sometimes ± cuneate.
Bracts

(1–)3–12(–15) mm distant from sepals, lanceolate, linear, linear-oblong, oblanceolate, or narrowly to broadly triangular, 4–22(–30) × 1–4(–7) mm, margins entire or proximally lobed or toothed.
Flowers

sepals 9–15 mm;

corolla white or cream, (20–)25–48 mm.

Calystegia occidentalis
Distribution
from USDA
w United States
[WildflowerSearch map]
[BONAP county map]
Discussion

Subspecies 2 (2 in the flora).

Subspecies occidentalis and subsp. fulcrata are distinguished essentially by entire versus proximally lobed or toothed bract margins; the distinction is not absolute.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Peduncles (1–)2–4-flowered; bract margins entire.
subsp. occidentalis
1. Peduncles 1-flowered; bract margins proximally lobed or toothed.
subsp. fulcrata
Source FNA vol. 14.
Parent taxa Convolvulaceae > Calystegia
Sibling taxa
C. atriplicifolia, C. catesbeiana, C. collina, C. felix, C. hederacea, C. longipes, C. macounii, C. macrostegia, C. malacophylla, C. peirsonii, C. pubescens, C. purpurata, C. sepium, C. silvatica, C. soldanella, C. spithamaea, C. stebbinsii, C. subacaulis, C. vanzuukiae
Subordinate taxa
C. occidentalis subsp. fulcrata, C. occidentalis subsp. occidentalis
Synonyms Convolvulus occidentalis
Name authority (A. Gray) 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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