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Project Name Data (Last Modified On 11/29/2012)

Flora Data (Last Modified On 11/29/2012)
Genus HYLOCEREUS (A. Berger) Britton & Rose
PlaceOfPublication Contr. U. S. Nat. Herb. 12:428. 1909
Reference Carnegie Inst. Wash. Publ. No. 248. 2:183. 1920.
Synonym Cereus subgen. Hylocereus A. Berger, in Ann. Rep. Missouri Bot. Gard. 16:72. 1905.
Description Succulent shrubby root-climbers, frequently epiphytic; stems phylloid and jointed, rooting adventitiously at the nodes, the joints elongate, usually 3-angled, the areoles marginal on the angles, shortly pubescent and with infrequent and inconspicuous spines. Leaves inconspicuous and fugacious or wholly lacking. Flowers nocturnal, sessile, borne singly at the areoles; perianth large, broadly in- fundibuliform, the segments very numerous, the outer progressively shorter and less petaloid than the inner, the tube rather broad and somewhat shorter than the seg- ments, bearing rather few conspicuous, persistent foliaceous bracts but without well-defined areoles; stamens very numerous, the filaments shorter than the peri- anth, united at progressively deeper levels to the hypanthium; ovary cylindric- ovoid, with few to numerous persistent accrescent foliaceous bracts but without well defined areoles; style filiform, somewhat longer than the stamens. Fruit a fleshy berry with numerous seeds.
Habit shrub
Distribution About 20 species of Central America, northern South America, and the Antilles.
Note Several species of Hylocereus are cultivated since they are amongst the most hand- some of the Nightblooming Cereuses and some have escaped and naturalized in the tropics of the Old World.
Key a. Areoles unarmed or with few and inconspicuous spines; perianth tube and ovary with few and distant bracts; stigma lobes dichotomous ................... 1. H. MONACANTHUS aa. Areoles with several short stout spines; perianth tube and ovary with numerous imbricate bracts; stigma lobes entire ..2. H. POLYRHIZUS
Note (Britton refers a sterile specimen collected by Cowell in Panama to H. triangularis but remarks "probably not native there, however." The stem joints of Cowell's specimen, which we have examined, are generally similar to those of H. polyrhizus but bear 8-10 spines at the areoles rather than the 3-5 usual for the latter species.)
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