: Southern Brazil, Rio Grande do Sul.
Habitat: This species usually grows between rocks.

• Parodia polyacantha (Link & Otto)
• Echinocactus polyacanthus Link & Otto
• Malacocarpus polyacanthus (Lehm.) Salm-Dyck
• Notocactus polyacanthus (Link & Otto) S.Theun.
• Wigginsia polyacantha (Link & Otto) F.Ritter

• Parodia langsdorffii (Lehm.) D.R.Hunt
• Cactus langsdorffii Lehm.
• Echinocactus langsdorffii (Lehm.) Link & Otto
• Malacocarpus langsdorffii (Lehm.) Britton & Rose
• Notocactus langsdorffii (Lehm.) Krainz
• Notocactus longispinus (F.Ritter) Havlíček
• Ritterocactus langsdorffii (Lehm.) Doweld
• Wigginsia langsdorffii (Lehm.) D.M.Porter
• Parodia langsdorffii f. eddiewarasii (N.Gerloff)
• Notocactus langsdorffii f. eddiewarasii N.Gerloff
• Parodia langsdorffii var. leprosorum (F.Ritter)
• Notocactus langsdorfii var. leprosorum (F.Ritter) Hofacker
• Notocactus leprosorum (F.Ritter) S.Theun.
• Notocactus leprosorum (F.Ritter) Havlíček
• Wigginsia leprosorum F.Ritter
• Parodia langsdorffii var. longispina (F.Ritter)
• Notocactus longispinus (F.Ritter) S.Theun.
• Wigginsia longispina F.Ritter
• Parodia langsdorffii subs. multiceps Hofacker & K.Herm
• Notocactus langsdorffii f. multiceps (Hofacker & K.Herm) Neduchal
• Notocactus pulvinatus var. multiceps (Hofacker & K.Herm) Garabelli & Wolman
• Ritterocactus langsdorffii subs. multiceps (Hofacker & K.Herm) Doweld
• Wigginsia langsdorffii subs. multiceps (Hofacker & K.Herm) Doweld
• Parodia langsdorffii var. prolifera (F.Ritter)
• Notocactus langsdorffii f. prolifer (F.Ritter) N.Gerloff
• Notocactus prolifer (F.Ritter) S.Theun.
• Wigginsia prolifera F.Ritter
• Parodia langsdorffii subs. pulvinata (Vliet) Hofacker & K.Herm
• Notocactus langsdorffii var. pulvinatus (Vliet) Neduchal
• Notocactus pulvinatus Vliet
• Ritterocactus langsdorffii subs. pulvinatus (Vliet) Doweld
• Wigginsia langsdorffii subs. pulvinata (Vliet) Doweld
• Parodia polyacantha (Link & Otto)
• Echinocactus polyacanthus Link & Otto
• Malacocarpus polyacanthus (Lehm.) Salm-Dyck
• Notocactus polyacanthus (Link & Otto) S.Theun.
• Wigginsia polyacantha (Link & Otto) F.Ritter

: Usually solitary (in the standard form), or branching.
Stem: Bright or dark green, globose to short cylindrical. The apex is depressed and filled with whitish-grey wool.
Ribs: Well marked and sharp, with scarcely prominent chinned tubercles. The crest of the ribs typically take on a purple red hue in full sun.
Areoles: Well spaced, woolly, recessed .
Spines: Several, yellowish, strong, about 20-25 mm long, spreading or curved down and backward.
Flowers: Small, lemon yellow with glossy shining petals, up to about 2-3 cm in diameter, standing near the top, and decorated with a red pistil which emphasizes the yellow of the petals. The buds are tomentose.
Blooming season: They bloom annually around June-July.
Remarks: Notocactus langsdorfi, together with the subordinated taxa ('leprosorum', 'longispinum', 'pulvinatus', ediewarasii', 'multiceps' and 'prolifer'), form a group of very similar and controversial southern Brasilian plants bearing small flowers and strong spination.

: It is easy to grow. They like a warm bright location, does great in partial shade avoid full sun. They need good drainage and prefer a neutral to slightly acidic compost with plenty of extra grit. Water and feed during the summer. Best if watered with rain water. Keep above 0°C and rather dry in winter, rot easily if the substrate is wet and cold, tends to lose its roots in winter.
Propagation: Seeds