1 84 



THE CACTACEAE. 



Type locality: IMinas Geraes, Brazil. 



Distribution: Brazil. 



"WTiile the joints are usually much flattened, yet they are sometimes strongly angled. 

 In some cases too the juvenile gro^rth is peculiar, forming short stubby joints with 6 ribs, 

 with closely set areoles, each bearing a cluster of 7 or more bristly spines. 



The plant flowers abimdantly in 'W^ashington in April. 



The two varieties Epiphyllum gaertneri coccineum and E. gaertneri mackoyanum 

 (Monatsschr. Kakteenk. 7: loi. 1897) are doubtless forms of this species. 



Illustrations: Wiener 111. Gart. Zeit. 10: 136. f. 60; Rev. Hort. 59: pi. opp. 516; Blanc, 

 Cacti 64. 1002; Cact. Joum. i: 9. 114; Gartenflora 33: pi. 1172; 39: f. 96; Rev. Hort. 

 Belg. 15: f. 23; pi. [19.] f. 2, opp. 229, as Epiphyllum russellianum gaertneri; Schelle, 

 Handb. Kakteenk. 213. f. 141; Curtis's Bot. Mag. 117: pi. 7201; Gartenwelt 10: 559, 

 as Epiphyllum gaertneri] Bliihende Kakteen i: pi. 21; Thomas, Zimmerkultur Kakteen 



Fig. 193. — Schlumbergera gaertneri. 



19; Monatsschr. Kakteenk. 4: 107; Riimpler, Sukkulenten 148. f. 80, as Phyllocactus 

 gaertneri] Rev. Hort. Belg. 15: pi. [19.] f. i, opp. 229; Journ. Hort. Home Farm. III. 18: 

 362. f. 58, as Epiphyllum makoyanum. 



Figure 192 is from a photograph of a plant which flowered in the Xew York Botanical 

 Garden in 1912 ; figure 193 shows a fruiting plant in the collections of the U. S. Department 

 of Agriculture at '\'\'ashington, D. C. 



2. Schlumbergera russelliana (Gardner) Britton and Rose, Contr. U. S. Xat. Herb. 16: 261. 1913. 

 Cereus russeUianiis Gardner in Lemaire, Hort. Univ. i: 31. 1839. 

 Epiphyllum russellianum Hooker in Curtis's Bot. Mag. 66: pi. 3717. 1840. 

 Phyllocadus russelliaitus Salm-Dyck, Cact. Hort. Dyck. 1844. 37. 1S45. 

 Epiphyllum truncatum russellianum G. Don in Loudon, Encycl. PI. ed. 3. 137S. 1855. 

 Schlumbergera epipkylloides Lemaire, Rev. Hort. l\'. 7: J53. 1858. 



Epiph}"tic, growing on trees, rocks, or in humus, often found in dark cre\-ices, i to 3 dm. long, 

 either hanging or erect, much branched, divided into short joints; joints i to 2.5 cm. long; lower 

 joints usually terete, covered with a brown epidermis; young joints green, flat, usually thin, with 

 I or 2 small teeth on a side, 8 mm. broad or less, usually truncate at apex ; areoles in axils of teeth, 

 small, naked or bearing i or 2 bristles; flowers terminal, 4 to 5 cm. long, reddish purple; style 

 slender, purple; ovar\- glabrous, sharply 4-angled, i -celled; o\"ules numerous, arranged in 4 or 5 

 vertical double rows along waUs of ovarj'; fruit described as red, 4-angled, or narrowty winded. 



