SCHLUMBERGERA. 1 83 



of that species by Regel. In 1890 Schumann considered them distinct species but congen- 

 eric; in 1897 he referred them to different genera. Both species are native of Brazil. 



These plants have usually been associated with ZygocacHis truncaius and all included 

 in Epiphyllum. Although resembUng Zygocactus very much in habit, they differ from it in 

 flower and fruit characters. The flowers are nearly regular, not strongly oblique; are 

 nearly rotate, not elongated; the stamens are of equal length and in a cylindric cluster 

 shorter than the style, not of unequal lengths and in a flattened cluster, not extending 

 beyond the style; the ovary and fruit are strongly angled, not terete. 



Lemaire named the genus for Frederick Schlumberger, an amateur student of plants 

 and a collector of cacti, begonias, and bromelias. 



Key to Species. 



Flowers scarlet ^- S- gaerlneri 



Flowers purplish 2.5. russelhana 



1. Schlumbergera gaertneri (Regel) Britton and Rose, Contr. U. S. Nat. Herb. 16: 260. 1913. 



Epiphyllum nissellianum gaertneri Regel, Gartenflora 33: 323. 1884. 

 Epiphyllum makoyanum W. Watson, Gard. and For. 2:^243. 1889. 

 Epiphyllum gaertneri Schumann in Martins, Fl. Bras. 4=: 218. 1890. 

 Phyllocactus gaertneri Schumann in Riimpler, Sukkulenten 147. 1892. 



Fig. 192. — Schlumbergera gaertneri. 



Branches spreading, the terminal ones often pendent; joints usually flattened, but sometimes 

 3 to 6-angled, fleshy, 5 cm. long or more by 2 cm. broad, dull green except the purplish crenate 

 margins; areoles small, with short white wool and a few yellowish bristles; flowers i to 3, usually 

 all at distal end of the terminal branches, 4 cm. long, dark scarlet; outermost perianth-segments 

 usually 5, short, thick, triangular, drying separately from the others; outer perianth-segments 

 spreading; innermost perianth-segments more erect, nearly distinct, acute; all of the segments, 

 except the 5 outer ones, more or less coalesce and withering, remaining on top of ovary ; ovary crowned 

 by a slightly depressed disk or umbilicus with upturned margin, which passes into the flower- tube; 

 on the margin are borne the free stamens; style slender, 1.5 cm. long, red; stigma-lobes 6, Imear, 

 cream-colored; ovary dark red, angled, 12 mm. long; fruit red, oblong, 15 mm. long, depressed at 

 apex, in cultivation ripening in July. 



