Origin and Habitat: Paraguay, between Carepegua and south-east of the Cerro Acahay, department Paraguarí, (it is one of the most southerly species of Eriocactus).
Altitude range: Around 500 metres above sea level.

• Parodia grossei (K.Schum.) F.H.Brandt
• Chrysocactus grossei (K.Schum.) Y.Itô
• Echinocactus grossei K.Schum.
• Eriocactus grossei (K.Schum.) Backeb. ex Schaffnit
• Eriocephala grossei (K.Schum.) Y.Itô
• Malacocarpus grossei (Schum.) Britton & Rose
• Notocactus grossei (K.Schum.) A.Berger

• Parodia schumanniana (Nicolai) F.H.Brandt
• Echinocactus schumannianus Nicolai
• Eriocactus schumannianus (Nicolai) Backeb.
• Eriocephala schumanniana (Nicolai) Y.Itô
• Malacocarpus schumannianus Britton & Rose
• Notocactus schumannianus (Nicolai) A.Berger
• Parodia ampliocostata (F.Ritter) F.H.Brandt
• Eriocactus ampliocostatus F.Ritter
• Notocactus ampliocostatus (F.Ritter) S.Theun.
• Notocactus schumannianus var. ampliocostatus (F.Ritter) S.Theun. ex Havlíček
• Notocactus schumannianus f. ampliocostatus (F.Ritter) Neduchal
• Parodia applanata (Werner Hoffm. & Backeb.) F.H.Brandt
• Parodia schwebsiana var. applanata Werner Hoffm. & Backeb.
• Parodia schwebsiana f. applanata (Werner Hoffm. & Backeb.) Krainz in Krainz
• Parodia grossei (K.Schum.) F.H.Brandt
• Chrysocactus grossei (K.Schum.) Y.Itô
• Echinocactus grossei K.Schum.
• Eriocactus grossei (K.Schum.) Backeb. ex Schaffnit
• Eriocephala grossei (K.Schum.) Y.Itô
• Malacocarpus grossei (Schum.) Britton & Rose
• Notocactus grossei (K.Schum.) A.Berger
• Parodia grossei var. aureispina (F.Ritter) F.H.Brandt
• Eriocactus grossei var. aureispinus F.Ritter
• Notocactus grossei var. aureispinus (F.Ritter) S.Theun.

• Parodia schumanniana subs. claviceps (F.Ritter) Hofacker & P.J.Braun
• Eriocactus claviceps F.Ritter
• Eriocactus schumannianus subs. claviceps (F.Ritter) Doweld
• Notocactus schumannianus subs. claviceps (F.Ritter) Doweld
• Parodia claviceps (F.Ritter) F.H.Brandt

Description: Parodia grosseiSN|1141]]SN|1154]] ( Eriocactus grosseiSN|1158]]SN|1158]] ) is only a form of Parodia schumannianaSN|1154]]SN|1141]] and most authors choose to lump them together. It is one of the largest species of the genus and distinguishes for having only 3 to7 long bristly white spines. Schumann originally described it with 16 ribs and four radial spines. It has a white, woolly crown and bright yellow flowers appear atop the plant in summer.
Stem: Globose to depressed or sometimes cylindric, sometimes up to 1.7 meters high and up to 30 cm thick.
Ribs: Usually 16, acute, somewhat crenate.
Areoles: Small, circular.
Spines: 3 to 7(-8), spreading, acicular, curved, white or brownish, the longer one 4 cm long.
Flower: Large, funnelform, citron-yellow, 4 cm long, when fully expanded broader than long. Perianth-segments oblanceolate to spatulate, obtuse, serrate above. Stamens numerous, short. Style slender, longer than the stamens; stigma-lobes 12 to 17, linear, white, recurved. Scales on the ovary numerous, linear, purplish, with wool and bristles in their axils.
Fruit: Short oblong, 2.5 cm long, 2 cm. in diameter.
Seeds: Bell shaped, 0.8(-2?) mm long and 0.8 mm thick, glossy reddish-black or black.

Bibliography: Major references and further lectures
1) Friedrich Ritter "Kakteen in Südamerika: Ergebnisse meiner 20 jährigen Feldforschungen" volume 1 Selbstverlag, 1979
2) Cactus and Succulent Journal of Great Britain, Volumes 29-33 Cactus and Succulent Society of Great Britain, 1967
3) N. L. Britton, J. N. Rose “The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family.” Volume 3, The Carnegie Institution of Washington, Washington 1922.

Cultivation and Propagation: Frost Tolerant as low as -4°C (or possibly colder) but in cultivation it is best to avoid any frost when during the winter the temperature can go down to 2° C without any harm so long as the compost is very dry. During the summer it is best to keep the plants outside where the temperature can rise to over 30 C with no harm to the plant.
Allows good drainage and use a an open and free draining mineral compost that allows therefore roots to breath.
They like only a short winter's rest and should be kept almost completely dry during the winter months, If the soil is allowed to be dry for too long root loss could follow but equally the same result would occur if the plants are both wet and cold. From March onwards the plant will begin to grow and watering should be increased gradually until late May when the plant should be in full growth.
Water regularly during the summer so long as the plant pot is allowed to drain and not sit in a tray of water. During hot weather you may need to water the plants more frequently so long as the plant is actively growing. From late September watering should be reduced to force the plant to go in to a state of semi dormancy, by October you should be back in to the winter watering regime.
Need full sun avoiding only the harshest summer sun, if kept too dark they may become overly lush and could be prone to rotting due to over watering, they will also be shy to produce flowers.
Feeding may not be necessary at all if the compost is fresh then, feed in summer only if the plant hasn't been repotted recently. Do not feed the plants from September onwards as this can cause lush growth which can be fatal during the darker cold months.
Repotting should be done every other year or every three years, annual potting is not necessary. Do not be tempted to over pot as this will cause the unused compost to go stagnant and you may loose the plant.
Propagation: Seed sowing and cuttings.