Gymnocalycium mihanovichii Fric ex Giirke Britton

Rose 1922 CHIN CACTUS, PLAID CACTUS

Echinocactus mihanovichii Fric ex Giirke 1905

Plants solitary, broadly globose, gray-green, often with reddish tint, 3-5 cm (1.2-2 in) high and in diameter. Ribs usually 8, acute, slightly notched. Spines 5-6, weak, flexible, slightly curved, grayish yellow, 0.8-1 cm (0.3-0.4 in) long. Flowers yellowish green to light olive green, 4-5 cm (1.6-2 in) long. Fruits spindle shaped. Distribution: Paraguay. Gymnocalycium mihanovichii is an extremely variable species and is also popular in horticulture. Consequently, more than 10 varieties have been described, several of which are not validly published, others questionable.

Gymnocalycium monvillei (Lemaire) Britton & Rose 1922 Echinocactus monvillei Lemaire 1838

Echinocactus multiflorus J. D. Hooker 1845, Gymnocalycium multiflo-

rum (J. D. Hooker) Britton & Rose 1918 Gymnocalycium brachyanthum Gürke 1907, G. monvillei subsp.

brachyanthum (Gürke) H. Till 1993 Gymnocalycium ourselianum (Cels ex Salm-Dyck) Y. Itö 1952, not validly published Gymnocalycium schuetzianum H. Till & Schatzl 1981 Gymnocalycium achirasense H. Till & Schatzl ex H. Till 1987, G. horri-dispinum var. achirasense (H. Till & Schatzl ex H. Till) H. Till & Schatzl 1987, G. monvillei subsp. achirasense (H. Till & Schatzl ex H. Till) H.Till 1993

Gymnocalycium horridispinum G. Frank ex H. Till 1987, G. monvillei subsp. horridispinum (G. Frank ex H. Till) H. Till 1993

Plants solitary, globose to flattened globose, dark green, 6-8 cm (2.4-3.1 in) high, to 20 cm (7.9 in) in diameter. Ribs 1017, broad, obtuse, strongly tuberculate, with distinct chinlike protrusions. Spines stout, thick, slightly curved, yellowish with reddish or purple bases. Central spines 1-4, sometimes absent. Radial spines 7-13, 3-4 cm (1.2-1.6 in) long. Flowers white, flushed with pink. 3-8 cm (1.2-3.1 in) long, to 7 cm (2.8 in) in diameter. Fruits globose, green, to 2 cm (0.8 in) in diameter. Distribution: Argentina.

Four subspecies of Gymnocalycium monvillei are recognized. Subspecies monvillei has 7-13 curving, somewhat compressed radial spines; it occurs mainly in Córdoba province. Subspecies horridispinum has 10-12 heavy, stiff radial spines; it occurs in Córdoba. Subspecies achirasense has 10-12 radial spines that lie almost flat against the plant body; it occurs in San Luis province. Subspecies brachyanthum has about 7 spines and also occurs in San Luis.

Gymnocalycium mostii (Gürke) Britton 8c Rose 1918 Echinocactus mostii Gürke 1906

Echinocactus kurtzianum Gürke 1906, Gymnocalycium kurtzianum

(Gürke) Britton & Rose 1922 Gymnocalycium valnicekianum Jajo 1934 Gymnocalycium grandiflorum Backeberg 1936 Gymnocalycium immemoratum A. Castellanos & Lelong 1939 Gymnocalycium tobuschianum Schick 1953 Gymnocalycium bicolor Schütz 1962

Plants solitary, flattened globose, dark green, 6-7 cm (2.42.8 in) high, to 13 cm (5.1 in) in diameter. Ribs 11—14, low, deeply notched, with prominent tubercles. Spines yellowish brown with dark tips, becoming gray with age, stout, curving. Central spines 1-2, to 2 cm (0.8 in) long. Radial spines 711,0.6-2.2 cm (0.2-0.9 in) long. Flowers rose pink, to 8 cm (3.1 in) long and in diameter. Fruits ovoid, slate blue-green, to 2 cm (0.8 in) long and 1.5 cm (0.6 in) in diameter. Distribution: Córdoba, Argentina.

Gymnocalycium monvillei subsp. monvillei

Gymnocalycium mucidum Oehme 1937 Gymnocalyciumglaucum F. Ritter 1963 Gymnocalycium ferrarii Rausch 1981

Plants solitary, flattened globose, reddish gray to grayish purple. Ribs 12 with acute tubercles. Spines 5-7, gray, needlelike, 1-2 cm (0.4-0.8 in) long. Flowers pinkish yellow, 4-4.5 cm (1.6-1.8 in) long, 4.5-5 cm (1.8-2 in) in diameter. Distribution: not known. Gymnocalycium mucidum is poorly known.

Gymnocalycium netrelianum (Monville)Britton8cRose 1922

Echinocactus netrelianum Monville 1853

Plants solitary, occasionally clustering. Stems globose to flattened globose with depressed tips, green to slightly glaucous, 3-8 cm (1.2-3.1 in) in diameter. Ribs about 14, broad, rounded. Spines 5-8, brown to yellow, bristle-like, to 1 cm (0.4 in) long. Flowers pale yellow, to 5 cm (2 in) long. Fruits globose, green, 1-1.5 cm (0.4-0.6 in) in diameter. Distribution: Uruguay.

Gymnocalycium neuhuberi H. Till 8c w. Till 1992 Gymnocalycium curvispinum Fric 1929

Plants solitary, flattened globose, gray-green, to 4.8 cm (1.9 in) high and 7 cm (2.8 in) in diameter. Ribs 9-12, wavy, forming distinct tubercles. Areoles round to oval, naked. Spines needle-like, stiff, straight to slightly curved, yellowish. Central spine one at first, later 4, forming a cross. Radial spines usually 9, upper two pairs shorter, 1.1-2 cm (0.4-0.8

Gymnocalycium mostii

in) long. Flowers funnelform, pale violet, 2.7-3.6 cm (1.1-1.4 in) long, 2.6-3.4 cm (1-1.3 in) in diameter; pericarpels and floral tubes with brownish hairs. Fruits oval, dark green, 1.5-1.8 cm (0.6-0.7 in) long, 1-1.2 cm (0.4-0.5 in) in diameter. Seeds pot shaped. Distribution: San Luis, Argentina.

Continue reading here: Gymnocalycium obductum Piltz 1990

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