210 THE CACTACEAE. 
Type locality: Woods near Caiguava, state of Parana, Brazil, altitude 1,100 to 1,300 
meters. 
Distribution: Southern Brazil. 
Illustrations: Svensk Bot. Tidskr. 6: pl. 28; Arch. Jard. Bot. Rio de Janeiro 2: pl. 
14, 15; Monatsschr. Kakteenk. 32: 121, as Rhipsalis rosea. 
Figure 210 is reproduced from the first illustration above cited. 
f 
/I7 ] 3. PFEIFFERA Salm-Dyck, Cact. Hort. Dyck. 1844. 40. 1845. 
Cael with a woody base; branches in wild state hanging, mostly 4-angled, not emitting 
aerial roots; spines several, acicular; flowers regular, diurnal, pale yellow to rose-cozored (sometimes 
described as purple-red), small, the segments united at base into a very short tube; stamens included, 
some borne on flower-tube and some on disk; ovary and fruit spiny; seeds black, oblong. 
Type species: Cereus ianthothele Monville. 
Only one species is known, and this was first described as a Cereus and afterwards 
referred to Khipsalis. We agree with the author in regarding it as a distinct genus. 
The genus was named for Dr. Ludwig Pfeiffer, a physician by profession and one of 
the most distinguished authorities on the Cactaceae. He visited Cuba in 1838-1839. Dr. 
Pfeiffer was born July 4, 1805, at Kassel, Germany, and died in 1877. 
Fic. 211.—Acanthorhipsalis micrantha. 
1. Pfeiffera ianthothele (Monville) Weber, Dict. Hort. Bois 944. 18098. 
Cereus tanthothele* Monville, Hort. Univ. 1: 218. 1839. 
Pfetffera ceretformis Salm-Dyck, Cact. Hort. Dyck. 1844. 41 
Rhipsalis ceretformis Férster, Handb. Cact. 454. 1846. 
Hariota cereiformis Kuntze, Rev. Gen. Pl. 1: 262. 1891. 
Rhipsalis ianthothele K. Brandegee, Cycl. Amer. Hort. Bailey 4:1514. 1902. 
1845. 
Stem weak, spreading or pendent, 3 to 6 dm. long, 2 cm. in diameter or less; joints 8 to 12 cm. 
long, 3 to 5-ribbed, 10 mm. in diameter, light green, spiny; ribs tuberculate; areoles 10 mm. apart; 
spines 6 or 7, 5 to 7 mm. long, yellowish; flowers including the ovary about 15 mm. long; inner 
perianth-segments 5, pale yellow to cream-colored, acute, erect or slightly spreading at tip; stamens 
qanerous, shorter than the perianth-segments, included; style longer than stamens; stigma-lobes 
8 linear, spreading; ovary strongly tuberculate, purplish, its areoles bearing white bristly spines; 
ruit globose, 12 to 16 mm. in diameter, rose-red, spiny; seeds numerous, black. 
* . : . . 
The specific name is sometimes spelled janthothele; it was originally given as ianthothelus. 
