122 



THE CACTAC^AE. 



Miller omits 



.V- 



in his Gardener's Dictionary (1768). 



Cercus fclluciJiis Pfeiffer (Enum 



formerly 



Lcpt 



Nat. Herb 

 Schumann 



forme 



subsection Acanihocereus; Pfeiffer, on the other hand, recognized several species as belonging 



to this group; we distinguish at least 7. 



name is from the Greek, meanmg 





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Key to Species. 



Ribs usually 3. rarely 4, thick. 



Joints 8 to 10 cm. wide, dee*ply crenate; spines very stout, subulate. 



Spines i to 6; perianth-tube about 7 cm. long i. 



Spines about 10, the outer 5 to 8, very short; perianth-tube about 12 cm. long 2. 



Joints 2 to 8 cm. wide, low-crenate; spines slender. 



Spines well developed, subulate 3- 



Spines short or none, when present acicular .4. 



Kibs 4 to 7, mostly thin. 



Plants green. 



Spines up to 7 cm. long; ribs 3 to 5 5- 



Spines 3 cm. long or less ; ribs 5 to 7 6. 



Plants bluish white; joints 4-angled; spines 2 to 6, the longest 2 cm. long 7. 



A. 

 A, 



A. 

 A 



horridus 

 colombianiis 



pentagonus 

 stibinermis 



A 

 A 

 A 



occidentalis 

 brasiliensis 

 albicaulis 



f 



-.F 



1. Acanthocereus horridus sp, nov. 



Plants stout, the joints strongly 3-angled or 3-winged, the young growth 5 or 6-angled; wings 

 with deep undulations; areoles large, 3 to 6 cm. apart; spines brown or blackish when young; radial 

 spines i to 6, very short, conic, less than i cm. long; central spine usually i, sometimes 2, often very 

 stout and elongated, sometimes 8 cm. long; flower, including the ovary, 18 to 20 cm. long; tube 4 

 cm. long, including the funnelform throat 12 cm. long; throat 4 cm. broad at mouth; outer perianth- 

 segments linear, brown or greenish, 6 cm. long; inner perianth-segments 3 to 4 cm. long; stamens 

 white; style thick, cream-colored; fruit 3.5 cm. long, light red, glossy, covered with large areoles 

 bearing white felt; skin thick, finally splitting as the 

 fruit ripens ; pulp red. 



Collected in Guatemala by F. Eichlam in 

 1909 (New York Botanical Garden No. 34788). 

 It has frequently flowered in cultivation, both 

 at Washington and at New York. 



r 



Here we are disposed to refer E. W. Nelson's 

 plant from San Juan Guichicovi, Oaxaca, Mex- 

 ico, collected June 21 to 24, 1895 (No. 2729). 



Figure 181 shows a part of a joint of the 

 type specimen. 



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2. Acanthocereus colombianus sp. nov. 



n > 



Erect, branching dicliotomously, 2 to 3 meters 

 high; joints about 9 cm. wide, strongly 3-\vinged;* 

 areoles large, 5 cm. apart; radial spines 5 to 8, very 

 short, less than 5 mm. long; central spines i or 2, 

 very stout, 4 to 5.5 cm. long; flower 25 cm. long, 

 white, with a rather stout tube 12 cm. long, the 

 gradually expanded throat 5 to 6 cm. long. 



W. Pennell and Henry 



H 



Calamar, Colombia, July 



10, 



Colombia 



H 



Fig. 181. — Part of joint of A. horridus. X0.4. 



1899 (No. 2423). According to Mr. Smith 



grows in dry forests and thickets at low altitudes ; here it is known 



*Pitahaya is a well-known name 



relatives, of which there are various s^^ 



fixes are sometimes used with it, as pitaha>c. ^ 

 it has the diminutives pitayita and pitahayita. 



as pitahaya. 



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