Echinofossulocactus arrigens Link
Echinocactus arrigens Link in Dietrich, Allg. Gartenz. 8: 161. 1840.
Echinocactus sphaerocephalus Mühlenpfordt, Allg. Gartenz. 14: 370. 1846.
Echinocactus allardtianus Dietrich, Allg. Gartenz. 15: 178. 1847.
Echinocactus arrigens atropurpureus Salm-Dyck, Cact. Hort. Dyck. 1849. 31, 162. 1850.
Plants simple, deep-seated in the soil, globular, 5 to 7 cm. in diameter, glaucescent, more or less depressed at the apex; ribs 24, thin and wavy; spines 8 to 11, yellow (according to Schumann); uppermost spine elongated, 2 to 4 cm. long, flattened, brownish; central spines 2 or 3, more slender and not quite so long as the uppermost one; radial spines 6 to 8, acicular, usually pale, spreading; flowers small, 2 to 2.5 cm. long; inner perianth-segments oblong, apiculate, with a deep purple stripe running down the center and with pale, nearly white margins.
Type locality: Mexico.
Distribution: Mexico, but definite locality is unknown.
Echinocactus xiphacanthus Miquel (Linnaea 12: 1. pl. 1, f. 1. 1838) is referred here by Schumann; if correctly, the name would replace E. arrigens. It is described as having 34 ribs; radial spines 4 or 5, short, pale; central spines 1 to 3, the upper one flat and long.
Echinocactus ensiferus Lemaire (Cact. Aliq. Nov. 26. 1838; E. anfractuosus ensiferus SalmDyck, Cact. Hort. Dyck. 1849. 31. 1850) is also referred here by Schumann. It, too, has priority over E. arrigens. It is described as globose; ribs 30 to 40.
Echinocactus arrectus Otto (Förster, Handb. Cact. 346. 1846), without description, is referred here as a synonym by Schumann.
Echinocactus ensiferus pallidus (Förster, Handb. Cact. 306. 1846) may also belong here.
Echinofossulocactus ensiformis (Lawrence in Loudon, Gard. Mag. 17 317. 1841) may or may not belong here.
Illustrations: Pfeiffer, Abbild. Beschr. Cact. 2: pl. 27; Förster, Handb. Cact. ed. 2. f. 69; Schelle, Handb. Kakteenk. 173. f. 103, as Echinocactus arrigens; (?) Linnaea 12: pl. 1, f. 1, as E. xiphacanthus.
Figure 120 is a reproduction of the first illustration cited above.
Continue reading here: Echinofossulocactus violaciflorus Quehl
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