190 



THE CACTACEAE. 



10. 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 intro- 



Werckle in 1 905 and fully described by Weingart 



Weber 



Schumann 



September 



M. A. Howe from the Urava Islands in 1912, showed 2-forked stigma 

 mm, long; other flowers, previously observed, showed simnle stie^ma 



Panama, in 19 12, which flowered in the New York 



Howe 



Fig. 267. — Hylocereus stenopterus. 



ems (W 



Cereus stenopterus Weber, Bull. Mus. Hist. Nat. Paris 8: 458. 



da 



1909 



A weak vine 

 green 



, not rooting freely from the sides, at least in cultivation, the joints 4 cm. broad, 

 flSwe?Tn"tn"T';T' T ^^^"^^V^' "^^ 3. thin; areoles slightly elevated; spines i to 3, small, yellow; 

 shor? about . c,^" on^' °P^f^^"g ^^ mght, closing very early (completely closed at 9 a. m.) ; tube 

 snort, about 2 cm. long; perianth-seements all similar. rf^c\A\^\. t.,ir^io i;«... „t,^„^ . .J i^n,r- 



stamens 



in? an ovo H nrnmTnaf . ;rV 1 ' "'^' '""''^ exserted; stigma-lobes white, when closed form- 



"/afe" i:^':r;^^rZ^i^^^ °^ °^^^^ ^-^ ^^--^-^^ -^icmar or the upper ones narrowly 



Type locality: Vallee de Tuis, Costa Rica. 



This species is common 



America 



grows 



Hylocereus in cultivation with red flowers exceot H 



It is 



from a plant obtained by Mr. William R. Maxon in San T 



York 



Figure 



Jz fnf.^^ vLiiii~" -- --^ ^^:^:^^:r^-z 





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