413 
10 mm. apart, straight yellow spines, of which 7 to 9 are radiant (6 to 
8 mm.) and 1 central (10 to 25 mm.), and elongated flowers (17 to 20 cm.). 
Specimeus examined: CuBaA ( Wright 2623). 
82. Cereus eriophorus Hort. Berol. in Pfeiff. Enum, 94 (1837). 
Stem simple, erect and columnar (becoming 6 mn. high and 3.5 em, in 
diameter), tapering at summit and jointed, with 8 to 10 obtuse and 
repand ribs, acute intervals at length obsolete, areolie 24 to 28 mm. 
apart, 9 to 12 needle-shaped white and black-tipped spines (8 to 16 mm. 
long), of which 8 to 10 are radial and spreading and 1 or 2 central, and 
large white funnel-form flowers (15 to 22.5 em. long) with calyx-tube 
covered with long wool. 
Specimens examined: CuBA (Wright 207, 2624, of 1865): also culti- 
vated in Haege & Schmidt Gard. in 1873; and in Harv. Bot. Gard. in 
1882. 
ARTIFICIAL KEY TO THE SPECIES. 
The following key is based upon spine characters and may be of 
service in case of incomplete material. Forms found within the United 
States are italicized; the species and varieties are indicated only by 
their specific or varietal names, and the numbers refer to the serial 
numbers of the synoptical presentation. 
* Central spines none. 
+ Radial spines 3 to 6 (12 to 35 mm. long). 
paucispinus (32), triglochidiatus (34). 
+ + Radial spines 12 to 20 (2 to 12 mm. long). 
viridiflorus (1), tubulosus (2), rigidissimus (10), adustus (18). 
+ + + Radial spines 20 to 80 (4 to 9 mm. long). 
cespitosus (7), castaneus (8), rigidissimus (10). 
* * Central spine solitary. 
+ Radial spines 2 to 10, 
Radials 1 to 2 mm. long. 
poselgeri (44), greggit (48), striatus (52), boeckmanni (59). 
Radials 2 to 4 mm. long. 
procumbens (43), nycticalus (56), compressus (58). 
Longest radials from 6 to 10 mm. 
Central spine 4 to 10 mm, long. 
marginatus (46), grandiflorus (55), armatus (80). . 
Central spine 10 to 25 mm. long. 
berlandieri (42), geometrizans (47), eburneus (54), pellucidus (81). 
Longest radials from 12 to 16 mm. 
aggregatus (38), napoleonis (57), pecten-aboriginum (68), tetazo (70). 
Longest radials from 16 to 20 mm. 
pitajaya (49), cochal (53), flexuosus (77), eriophorus (82). 
