Echinofossulocactus violaciflorus Quehl

Echinocactus violaciflorus Quehl, Monatsschr. Kakteenk. 22: 102. 1912.

Simple, at first globose, but becoming columnar, 8 to 10 cm. in diameter; ribs about 35, thin, deeply crenate; spines about 7, the 4 or lower ones 7 to 12 mm. long, appressed or incurved, white, subulate, the upper spines flattened, 3 to 6 cm. long, ascending and the uppermost ones connivent over the top of the plant; flowers 2 to 2.5 cm. long; perianth-segments narrow, acuminate, white with a violet or purplish stripe down the middle; scales on the ovary more or less imbricated, in 3 or 4 rows, broadly ovate, apiculate with scarious margins.

Type locality: Zacatecas, Mexico.

Distribution: Zacatecas and Aguas Calientes.

Our description is drawn in part from a plant sent to the New York Botanical Garden by Mr. H. Donnerstein in 1908, which flowered in April 1921, and in part from specimens collected by W. E. Safford at Aguas Calientes, Mexico, in 1907 (No. 1359).

Illustrations: Monatsschr. Kakteenk. 22: 103, as Echinocactus violaciflorus; Ann. Rep. Smiths. Inst. 1908: pl. 4, f. 5, as Echinocactus crispatus.

Plate xxiii, figure 5, shows the plant collected by William E. Safford, February 21, 1907 (No. 1359). which flowered in Washington and was painted May 9, 1907. Figure 121 is from a photograph of the same plant.

13. Echinofossulocactus obvallatus (De

Candolle) Lawrence in Loudon,

Echinocactus obvallatus De Candolle, Prodr. 3: 462. 1828.

Obovoid to globose, depressed at apex; ribs about 25, rather thin and undulate; spines about 8, 4 spines subulate, ascending or spreading, 4 spines short, perhaps not one-fourth the length of the longer ones; flowers central, very large; perianth-segments linear-oblong.

Fig. 121.—Echinofossulocactus violaciflorus.

Type locality: Mexico. Distribution: Hidalgo, Mexico. This species is based on Mocino and Sesse's illustration of Cactus obvallatus. We have been unable to refer here, with any degree of approximation, any Mexican material we have seen. Pfeiffer's plate 22 (Abbild. Beschr. Cact. 2:), originally referred here, must be quite distinct, for it has very differently shaped flowers, spines, and ribs. The Index Kewensis refers this illustration to Echinocactus lancifer of which it seems to be the type.

Echinocactus obvallatus spinosior of Lemaire (Salm-Dyck, Cact. Hort. Dyck. 1849. 30. 1850) and also of Monville (Salm-Dyck, Cact. Hort. Dyck. 1844. 20. 1845) as well as variety pluricostatus Monville (Salm-Dyck, Cact. Hort. Dyck. 1844. 20. 1845) are all names without description.

Echinocactus coptonogonus obvallatus Salm-Dyck (Cact. Hort. Dyck. 1844. 20. 1845), unpublished, doubtless belongs here.

Illustrations: Cact. Journ. 2: 10; Dict. Gard. Nicholson 1: 500. f. 692; Förster, Handb. Cact. ed. 2. 535. f. 68; Schelle, Handb. Kakteenk. 172. f. 101; Watson, Cact. Cult. 113. f. 41; Karsten and Schenck, Vegetationsbilder 2: pl. 19, a; Mem. Mus. Hist. Nat. Paris 17: pl. 9, as Echinocactus obvallatus.

Figure 122 is copied from the last illustration cited above.

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