The genus includes 25 species, all of which are beautiful plants.
Notocactus concinnus. S. Brazil and Uruguay. The astern is globular, glossy green, depressed at the top with about 18 ribs. Radial spines number 10 to 12, central spines 4. Theappear at the top of the plant, the outer petals being red with a darker dorsal band, the inner petals canary-yellow. It is a free-flowering plant requiring full sunshine.
Notocactus Leninghausii. S. Brazil. Theis cylindrical, with about 30 ribs. Radial spines number about 15; central spines 3 or 4. The appear at the top of the plant, the outer petals being greenish, the inner petals yellow. This is a very popular , requiring half shade and moderate .
Notocactus Graessneri. S. Brazil. An interesting species. The globularis flattened and depressed at the top, with 50 to 60 ribs arranged spirally. The areoles have yellow wool and numerous spines, of which the 5 or 6 centrals are thicker. Flowers appear at the top of the plant, and are greenish-yellow. Of easy cultivation in half shade.
Notocactus scopa. S. Brazil and Uruguay. A lovely species entirely covered with white spines. Ribs number 30 to 35; radial spines about 40; central spines 3 to 4. The flowers appear at the centre, and are yellow. This plant requires full sunshine and theshould be rich. During the summer season it should be freely watered, but care must be exercised to keep the plant dry in winter.
Notocactus tabularis. Uruguay and S. Brazil. The bluish-green stem is globular or elongated, with 16 to 23 ribs. Radial spines number 16 to 18, central spines 4. The flower is glossy yellow with a carmine throat. The species isand free flowering but does best in half shade.
Notocactus muricatus. Uruguay and S. Brazil. The stem is pale green, globular or elongated, with about 20 ribs. Radial spines number 15, central spines 3 to 4. The flower is pale yellow. This species requires full sunshine and is not difficult to grow.
Notocactus apricus. Uruguay. A very popular plant requiring full sunshine. It is, and will flower readily. The globular, pale green stem has 15 to 20 ribs, slightly notched; radial spines number 18 to 20, centrals 4. The flowers are large and yellow, with the outer petals reddish on the dorsal side.
Notocactus floricomus. Uruguay. The stem is globular, with 20 ribs. Spines number 20, with 4 or 5 spreading central spines. The yellow flowers are produced freely. The plant is of rather slow growth and does best in half shade.
Notocactus pampeanus. Uruguay and Argentina. Has a dark green stem, globular, elongating with age, having 21 ribs. Radial spines number 7 to 10, and are yellow in colour; 1 central spine. Flowers, yellow.
Notocactus Ottonis. S. Brazil, Uruguay, Paraguay and Argentina. One of the most beautiful species of the genus. An excellent plant for beginners, it flowers freely, requiring half shade. The stem is solitary, or sprouting from the base, globular or elongated, with 10 to 13 ribs. Radial spines number 10 to 18, central spines 3 or 4. The flower is glossy yellow, and the stigma has 14 dark red lobes.
Varieties of this species are: var. tenuispinus, var. tortuosus, var. paraguayensis, var. Uruguay ensis, var. linkii, var. brasiliensis.
Notocactus Haselbergii. S. Brazil. A deservedly popular cactus having a globular stem, flat and depressed at the top and entirely covered with white spines. The areoles contain white wool, and bear about 20 radial spines and 3 to 5 central spines. The outer petals of the flower are red, the inner petals orange-red. Flowers last for over a week. Of easy cultivation, requiring half shade.