Hylocereus monacanthus Lemaire

Cereus monacanthus Lemaire, Hort. Univ. 6: 60. 1845.

Stems green, 3-angled, the margins undulate; areoles remote, about 3 cm. apart, tomentose; spines usually single, sometimes 2, rigid, much swollen at base; flowers funnelform, large, 28 cm. long, 17 cm. broad; ovary and tube covered with large scales; outer perianth-segments narrow, greenish; inner perianth-segments oblong-ovate; filaments numerous, about 200, 8 to 9 cm. long, white but rose-colored at base; style thick, exserted, yellow; stigma-lobes numerous, spreading.

Type locality: Colombia.

Distribution: Colombia and Panama.

This species was first introduced by Cels and published in 1845. It was again introduced by Werckle in 1905 and fully described by Weingart in 1911. Both Dr. Weber and Dr. Schumann considered it to be a variety of Cereus martinii.

A flower observed at the New York Botanical Garden September 6, 1918, and a plant brought by Dr. M. A. Howe from the Urava Islands in 1912, showed 2-forked stigma-lobes, the forks 2 to 3 mm. long; other flowers, previously observed, showed simple stigma-lobes.

Plate xxix shows a branch of the plant collected by Dr. Howe, on Urava Island, Bay of Panama, in 1912, which flowered in the New York Botanical Garden in 1915.

Fig. 267.—Hylocereus stenopterus.

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