Nyctocereus oaxacensis sp nov

Stems branching, slender, 2 to 3 cm. in diameter; ribs 7 to 10, rather low; areoles 10 mm apart; radial spines 8 to 12, 4 to 15 mm. long, slender, brownish; centrals 3 to 5; flowers 8 to 10 cm. long, "whitish inside, dirty purplish or reddish outside"; perianth-segments linear to oblong, rounded at apex; stamens not extending nearly as far as the perianth-segments; ovary densely covered with brownish bristly spines.

Collected by E. W. Nelson about Lagunas, Oaxaca, Mexico, altitude 255 meters, June 5, 1895 (No. 2543, type).

We refer here tentatively another specimen also collected by Mr. Nelson near Huilotepec, Oaxaca, altitude 30 meters, May 4 to 11, 1895 (No. 2585).

Fig. 178.—Nyctocereus guatemalensis, as it flowered in Washington.
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