CLEISTOCACTUS. 175 



The flowers are so different from the typical species that there is some doubt in our 



minds whether it is a true ( 'leistocactus. 



Through the kindness of Dr. Juan A. Dominguez, director of the Museo Parma 

 Cologico at Buenos Aires, Dr. Rose was permitted to bring to the United .States certain 

 critical specimens for detail study. Among these plants were flowers of a Cleistocactus, 

 straight and regular but much larger than those of ( '. smaragdifiorus. Unfortunately, only 

 flowers were preserved. These may be described as follows: flowers 6 to 7 cm. long, 

 straight; outer perianth-segments apiculate; inner perianth-segments oblong, obtuse or 

 rounded; stamens and style exserted. The plant was collected by Fritz Claren in Jujuy, 

 Department of Santa Catalina, altitude 3,400 to 4,300 meters, in 1901 (No. 11576). It is 

 probably an undescribed species, but it deserves further study. 



The name Cereus colubrinus smaragdifiorus Weber (Diet. Hort. Bois 281. 1894), without 

 formal publication, is implied, but the name was not actually used until later (Monatssclir. 

 Kakteenk. 15: 122. 1905). 



Illustrations: Bliihende Kakteen 2: pi. 87; Monatsschr. Kakteenk. 15: 123, both as 

 C 'ereus smaragdifiorus. 



Figure 248 is from a photograph of an Argentine specimen communicated by Dr. 

 Spegazzini as typical. 



3. Cleistocactus anguinus (Giirke). 



Cereus anguinus Giirke, Monatsschr. Kakteenk. 17: 166. 1907. 



Branches decumbent; ribs 10 or 11, low; radial spines 18 to 22, grayish but brownish at base 

 and apex, slender; central spines 1 or 2, stouter than the radials, yellowish; flowers somewhat one- 

 sided, tubular, 7 em. long, orange-yellow, 7.5 cm. long; stamens exserted. 



Type locality: Paraguay. 



Distribution: Paraguay. 



We have studied a small plant in the collection of the New York Botanical Garden 

 received from the Berlin Botanical Garden in 19 14; vegetatively this resembles Cleisto- 

 cactus baumannii. We also refer here a plant collected by J. A. Shafer at Paraguavi, 

 Paragnay, March 21, 22, 1917 (No. 144). 



PUBLISHED SPECIES, KNOWN TO US ONLY FROM DESCRIPTION. 



Cleistocactus laniceps (Schumann) Gosselin, Bull. Mens. Soc. Nice 44: 32. 1904. 

 Cereus laniceps Schumann, Gesamtb. Kakteen 93. 1897. 



Upright, 4 meters high or less; branches 5 cm. thick; ribs 9, blunt; areoles large, 6 mm. in 

 diameter or more; spines usually 3 at an areole in a vertical row, subulate, gray, about 1.5 cm. long; 

 flowers from a single rib, 3.5 cm. long; ovary spherical, 5 mm. long, covered with subulate scales, 

 these bearing copious brown wool in their axils; fruit red, woolly, 1 cm. in diameter. It was collected 

 near Tunari, Bolivia, at 1,300 meters altitude. 



Cleistocactus parvisetus (Otto) Weber in Gosselin, Bull. Mens. Soc. Nice 44: 46. 1904. 

 Cereus parvisetus Otto in Pfeiffer, Enum. Cact. 79. 1837. 



Originally described from a Brazilian specimen grown at Berlin, as follows: Simple, slender, 

 12 to 15 mm. in diameter, erect, with 12 angles; ribs somewhat compressed; areoles close together, 

 white; upper spines 4 or 5, brown; lower spines 6 to 8, white, hair-like. 



According to .Schumann this species is found in the Serra da Lapa, Minas Geraes, 

 Brazil. We do not know its relationship, although Weber thought it was a Cleistocactus. 

 It was introduced only once, probably by Riedel, and is not now in cultivation. 



This comes from the same region as the species of Lcocereus and should be compared 

 with plants of that genus. 



