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FOC | Family List | FOC Vol. 5 | Polygonaceae

3. Fallopia Adanson, Fam. Pl. 2: 277, 557. 1763.

首乌属 shou wu shu

Li Anjen (李安仁 Li An-ren); Chong-wook Park

Bilderdykia Dumortier; Pleuropterus Turczaninow.

Herbs annual, rarely subshrubs. Stems twining. Leaves simple, alternate, petiolate; leaf blade ovate or cordate, margin entire; ocrea tubular, apex oblique or truncate. Inflorescence racemose or paniculate. Flowers bisexual. Perianth persistent, 5-parted; outer 3 tepals larger, keeled or winged, rarely without keels or wings. Stamens 8. Styles very short; stigmas capitate. Achenes trigonous, ovoid.

Between seven and nine species (but ca. 20 if taken more broadly to include Reynoutria): widespread in N temperate zone; eight species (three endemic) in China.

1 Annual herb; inflorescence a raceme.   (2)
+ Perennial herb or subshrub; inflorescence paniculate.   (4)
2 (1) Tepals outer 3 keeled or narrowly winged on abaxial surface, slightly accrescent in fruit.   1 F. convolvulus
+ Tepals outer 3 winged on abaxial surface, accrescent in fruit.   (3)
3 (2) Wings dentate; perianth (including wings) in fruit obovate; achenes minutely granular-striate, slightly shiny.   2 F. dentatoalata
+ Wings entire; perianth (including wings) in fruit orbicular; achenes smooth, shiny.   3 F. dumetorum
4 (1) Subshrub; leaves clustered.   4 F. aubertii
+ Perennial herb; leaf solitary or leaves alternate.   (5)
5 (4) Leaves alternate; achenes 3.9-4.8 mm.   8 F. forbesii
+ Leaf solitary; achenes to 3 mm.   (6)
6 (5) Tepals: outer 3 winged on abaxial surface, accrescent in fruit.   5 F. multiflora
+ Tepals not winged, not accrescent in fruit.   (7)
7 (6) Stems glabrous, sparsely papillate; leaf ovate-triangular; tepals 3-4 mm.   6 F. denticulata
+ Stems densely brown pilose and sparsely hirsute or glabrescent; leaf broadly cordate or broadly hastate-cordate; tepals 1.5-2 mm.   7 F. cynanchoides

  • List of lower taxa


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