2IO THE CACTACEAE. 



Type locality: Woods near Caiguava, state of Parana, Brazil, altitude i,ioo to 1,300 

 meters. 



Distribution: Southern Brazil. 



Illustrations: Svensk Bot. Tidskr. 6: pi. 28; Arch. Jard. Bot. Rio de Janeiro 2: pi. 

 14, 15; Monatsschr. Kakteenk. 32: 121, as Rhipsalis rosea. 



Figure 210 is reproduced from the first illustration above cited. 



3. PFEIFFERA Salm-Dyck, Cact. Hort. Dyck. 1844. 40. 1845. 



Epiphytic, 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-colored (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 Rhipsalis. 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. 



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Fig. 211. — Acanthorhipsalis micrantha. 



1. Pfeiffera ianthothele (Monville) Weber, Diet. Hort. Bois 944. 1898. 

 Cereus ianthothele* Monville, Hort. Univ. i: 218. 1839. 

 Pfeiffera cereiformis Salm-Dyck, Cact. Hort. Dyck. 1844. 41. 1845. 

 Rhipsalis cereiformis Forster, Handb. Cact. 454. 1846. 

 Hariota cereiformis Kuntze, Rev. Gen. PI. i: 262. 1891. 

 Rhipsalis ianthothele K. Brandegee, Cycl. Amer. Hort. Bailey 4: 1514. 1902. 



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 

 numerous, 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; 

 fruit 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 . 



