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Published In: Journal of the Horticultural Society of London 1: 70–72, f. [p. 71]. 1846. (J. Hort. Soc. London) Name publication detailView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Introduced

 

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2. Calystegia pubescens Lindl. (Japanese bindweed)

Convolvulus pellitus Ledeb. f. anestius Fernald

Map 1578

Stems mostly 30–200 cm long, scrambling or trailing, twining, at least toward the tip, glabrous or more commonly sparsely pubescent with short hairs. Leaves short- to less commonly long-petiolate, usually sparsely pubescent with short hairs, the petiole usually less than 1/2 as long as the midvein of the accompanying leaf blade. Leaf blades 2–8 cm long, oblong to narrowly ovate-triangular, narrowed to a bluntly or more commonly sharply pointed tip, deeply cordate at the base, the sinus U-shaped or occasionally V-shaped, the basal lobes often each with 1 or 2 additional shallow lobes along the upper portion, spreading, angular, mostly sharply pointed. Flowers solitary or less commonly paired in the axils of leaves, positioned mostly above the stem midpoint. Bracts 15–21 mm long, usually overlapping only toward the base, not strongly inflated (usually appearing somewhat angular), ovate to oblong-ovate, rounded to bluntly pointed at the tip, usually glabrous. Sepals 8–10 mm long, ovate to oblong-ovate. Corollas doubled (at least in Missouri material), 2.5–4.0 cm long, pink. Fruits not produced. 2n=22. May–September.

Introduced, uncommon and widely scattered, mostly in and around urban areas (native of Asia; introduced sporadically in the eastern U.S. west to Iowa, Idaho, and Canada). Fallow fields, gardens, roadsides, railroads, and open, disturbed areas.

Missouri plants were included in the circumscription of Convolvulus pellitus f. anestius, which was based upon a sterile cultivar with doubled flowers (sometimes known as California rose). Presumably they escape from ornamental plantings via fragments of roots or stems. The correct species determination of this cultivar has been controversial. It has been classified variously under Calystegia pellita (Ledeb.) G. Don, C. hederacea Wall., C. dahurica (Herb.) Choisy, and C. pubescens, and under Convolvulus japonicus Thunb. (non Choisy) and C. wallichianus Spreng. The present assignment follows that of Fang and Brummitt (1995) in the recent Convolvulaceae treatment for the Flora of China series.

 
 


 

 
 
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