Cereus spinibarbis Otto in Pfeiffer, Enum. Cact. 86. 1837.
Cereuspanoplaeatus Monville, Hort. Univ. 1: 220. 1840.
Eulychnia breviflora Philippi, Fl. Atac. 24. i860.
Echinocereus spinibarbis Schumann, Monatsschr. Kakteenk. 5: 124. 1895.
Cereus breviflorus Schumann, Gesamtb. Kakteen Nachtr. 23. 1903.
Stems 2 to 4 meters high, much branched; branches 7.5 cm. in diameter; ribs 12 or 13; spines about 20 from an areole, usually 18 mm. long, but the longest one at times 15 cm. long; flowers 3 to 5 cm. long; scales on ovary and flower small, bearing in their axils long brown wool; outer perianth-segments short, acuminate; inner perianth-segments white to pinkish, oblong, 2 cm. long, acute; style short, 1.5 cm. long including the stigma-lobes; scales on the ovary small, their axils filled with long brown wool.
Type locality: Near Coquimbo, Chile.
Distribution: Along the coast of the province of Coquimbo, Chile.
1. E. spinibarbis
2. E. iquiquensis
4. E. castanea
The only difference Dr. Rose was able to observe in the field between this species and E. acida is the very woolly flower and fruit of E. spinibarbis. The flowers seemed to be identical in form, size, and color and at La Serena the two were growing side by side; the form with long silky wool on the flowers was never seen in the interior valleys, although thousands of flowers were there observed.
Cereus tortus (Förster, Handb. Cact. 391. 1846) may belong here.
Cereus chilensis breviflorus (Hirscht, Monatsschr. Kakteenk. 8: 159. 1898) doubtless belongs here, but has not been described.
Illustrations: Fl. Atac. pl. 2, f. A, as Eu-lychnia brevflora; Rep. Mo. Bot. Gard. 16: pl. 4, f. 1, as Cereus breviflorus; Schumann, Gesamtb. Kakteen f. 11, as C. coquimbanus.
Figure 122 is from a photograph of a plant brought by Dr. Rose to the New York Botanical Garden from the Botanical Garden of Santiago, Chile, under the name Eulychnia breviflora, in 1914.
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