- Rumex crispus is a perennial herb with erect flowering stems 11.8-63 in. (30-160 cm) in length.
- Basal leaves up to 15.7 in. (40 cm) x 4.3 in. (11 cm), lanceolate or oblong-lanceolate in shape. Upper Cauline leaves are less crisped than basal leaves, with petioles up to 2.4 in. (6 cm) in length. Leaf margins of cauline leaves vary from nearly flat to strongly crisped.
- Flowers are crowded in whorls which are usually distinct except towards the ends of branches. Perianth segments are orbicular-deltoid in shape are green colored at flowering but become brown.
- The fruit is 0.14-0.24 in. (3.5-6 mm) x 0.12-0.24 in. (3-6 mm) and is enclosed within inner perianth segments. Margin of fruit is entire or minutely denticulate.
- Ecological Threat
- Rumex crispus is found in grasslands, pastures and arable land. It is native to Africa, temperate and tropical Asia and Europe.
Global Invasive Species Database. 2011. Invasive Species Specialist Group (ISSG) of the IUCN Species Survival Commission 
University of California, Jepson Flora Project 
Flora of North America, www.eFloras.org 
University of Florida IFAS Extension 
California Invasive Plant Council 
USDA NRCS PLANTS 
USDA ARS GRIN 
Images from Bugwood.org