Echinofossulocactus tricuspidatus Scheidweiler

Echinocactus tricuspidatus Scheidweiler, Allg. Gartenz. 9: 51. 1841.

Echinocactus melmsianus Wegener, Allg. Gartenz. 12: 6. 1844.

Echinocactusphyllacanthus tricuspidatus Förster, Handb. Cact. 311. 1846.

Globose to short-cylindric, 5 to 8 cm. broad; ribs numerous, 30 to 55, thin, wavy; areoles at first lanate, afterwards naked; spines 5 (Schumann says 9 to 11), the upper one thin, compressed, sometimes 3-toothed at apex, 8 to 33 mm. long, reddish with a black tip; the other 4 spines spreading, more or less appressed, straight or recurved, gray or reddish with black tips, much shorter than the upper one; flowers greenish yellow, 1.5 cm. long; inner perianth-segments short-oblong, obtuse, the outer ones more or less acute or apiculate; scales on the ovary broadly ovate with a scarious margin and a more or less prominent cusp.

Type locality: Not cited.

Distribution: San Luis Potosí, Mexico.

Our description is based on a large series of specimens all from near San Luis Potosí where they were collected by Dr. Edward Palmer in 1902 and 1905 and by C. R. Orcutt about 1915. This species is unlike any of its relatives, being characterized by the very short foliaceous upper spine.

Schumann's description of this species does not read much like the original and must represent a different species.

19. Echinofossulocactus phyllacanthus (Martius) Lawrence in Loudon, Gard. Mag. 17: 317. 1841.

Echinocactusphyllacanthus Martius, Allg. Gartenz. 4: 201. 1836.

Echinocactusphyllacanthoides Lemaire, Cact. Gen. Nov. Sp. 28. 1839.

Echinofossulocactus phyllacanthus macracanthus Lawrence in Loudon, Gard. Mag. 17: 317. 1841.

Echinofossulocactus phyllacanthus micracanthus Lawrence in Loudon, Gard. Mag. 17: 317. 1841.

Simple, depressed-globose to short-cylindric, 3 to 15 cm. high, 4 to 10 cm. in diameter, dull green; ribs 30 to 35, thin, undulate; areoles only a few to a rib, white-tomentose when young; spines 5 to 9; upper spine, or rarely 2 spines, much elongated, erect or connivent over the top of the plant, flattened, thin, somewhat annulate, 4 cm. long; other spines weak-subulate, usually pale and spreading; flowers 15 to 20 mm. long, yellowish; inner perianth-segments acute.

Type locality: Mexico.

Distribution: Central Mexico; also reported from Mazatlan on the Pacific Coast of Mexico.

A good illustration of this species is published by Pfeiffer and Otto which is doubtless typical. Karwinsky's plant, from which the illustration was made, came from near Pachuca, Mexico. At this locality Dr. Rose collected flowers in 1905 (No. 8717) and these correspond to Pfeiffer's illustrations. At the same time and under the same number was collected a second species of this genus which is very distinct, showing how easily the species of this group can be confused.

Several varieties have been described, but these may not all belong here. These are as follows: laevior Monville, laevis Lemaire, macracanthus, micracanthus, pentacanthus, tenuiflorus (E. tenuiflorus Link in Salm-Dyck, Cact. Hort. Dyck. 1844. 20. 1845, name only) and tri-cuspidatus Förster.

Echinocactus stenogoni occurs occasionally as a legend for illustrations. This of course refers to Echinocactus series stenogoni. The first one which we have examined (Krook, Handb. Cact. 71. f. a) is figure 2 taken from Pfeiffer and Otto's plate 9, cited below. It occurs also in de Laet (Cat. Gen. f. 50, No. 6) for this or some closely related species. A third reference also occurs (Wiener Ill. Gart. Zeit. 29: f. 22, No. 6).

Illustrations: Pfeiffer and Otto, Abbild. Beschr. Cact. 1: pl. 9; Abh. Bayer. Akad. Wiss. München 2: (see 738) pl. 2, f. 3, as Echinocactus phyllacanthus.

Figure 124 shows the first illustration cited above.

Continue reading here: Echinofossulocactus lancifer Dietrich

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