176 



THE CACTACEAE. 



Cleistocactus hyalacanthus (Schumann) Gosselin, Bull. Mens. Soc. Nice 44: 33. 1904. 

 Cereus hyalacanthus Schumann, Gesamtb. Kakteen 101. 1897. 

 This is described as upright, less than 1 meter high ; ribs 20, low, obtuse ; areoles elliptic ; spines 

 in clusters of 25 or more, the longest 2 cm. long, acicular, white, puberulent; flowers somewhat 

 curved, 3 to 3.5 cm. long; ovary covered with numerous scales bearing copious brown wool in their 

 axils. 



It is known only from specimens collected by Otto Kuntze in the Province of Jujuy, 

 Argentina. 



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

 Cereus parviflorus Schumann, Gesamtb. Kakteen 100. 1897. 

 Described as columnar, 2 to 3 meters high; branches 3 cm. in diameter; ribs 12, deeply marked 

 by transverse furrows; radial spines 5 to 7, the longest one 4 mm. long, subulate, dark yellow; flowers 

 from only a single rib, one above another, 2.5 to 3 cm. long; ovary covered with short, oblong to 

 triangular scales bearing in their axils felt; fruit yellow, 1 cm. in diameter. 



Collected near Parotani, Bolivia, by Otto Kuntze. 



35. ZEHNTNERELLA gen. nov. 



Tall and slender, much branched at base; ribs numerous, very spiny; flowers scattered along 

 the upper part of the stem, 1 from an areole, perhaps night-blooming, very small ; tube short but 

 definite, about the length of the throat; 

 base of throat filled with a ring of long 

 white hairs; inner perianth-segments 

 minute, white; ovary and flower-tube 

 covered with small scales, their axils filled 

 with hairs; fruit small, globular; seeds 

 minute, tuberculately roughened, brown- 

 ish to blackish, with a large basal slightly 

 depressed hilum. 



Named for Dr. Leo Zehntner, for- 

 merly of the HortoFlorestal, Joazeiro, 

 Brazil, who has furnished us spec- 

 imens and valuable information con- 

 cerning many of the cacti from this 

 region. It is a great pleasure to name 

 a genus for this very keen observer, who 

 has done such valuable work in Brazil, 

 often under very trying circumstances. 

 It is based upon a plant which Dr. 

 Rose collected with him on the hills 

 east of Joazeiro, Bahia, June 4, 1915 

 (No. 19760). Our plant may be the 

 same as Cereus squamosus Gurke 

 (Monatsschr. Kakteenk. 18:70. 1908). 

 A photograph of this species was 

 reproduced (Bot. Jahrb. Engler 40: 

 Beibl. 93: pi. 10) and this resembles 

 Zehntnerella squamulosa, but the de- 

 tailed description of Cereus squamosus 

 does not wholly agree with it, and we 

 have been unable to examine the type 

 specimen of Cereus squamosus. 



Fig. 249. — Zehntnerella squamulosa. 



