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REVISION OF THE GENUS CEREU8 MILL. 85 



EXPLANATION OF PLATES. 



Plate 5 is from a photograph by the author, and plate 

 12 from photographs by Mr. E. Darns, of Berlin. The 

 other illustrations are from the author's drawings. 



Plate 1. — Pachycereus: Cereus Pringlei Wats. — 1, Flower, natural 

 size. 2. Flower, longitudinal section (from specimens collected by 

 Pringle, in the Royal Herbarium at Berlin). 3 Fruit (after K. Schu- 

 mann). 4, Seeds, natural size and enlarged. 



Plate 2. — Oreocereus: Cereus Celsianus A. Berg. — 1, Flower. 2, 

 Flower, longitudinal section; both natural size. From La Mortola, Ven- 



timiglia, Italy. 



Plate 3. — Stenocerecjs: Cereus stellatus Pfeiff. — 1, Flower. 2, 

 Flower, longitudinal section; both natural size. 3, Scale from the ovary, 

 enlarged. 4, Petal, natural size. From La Morlola. — Cereus sonoren- 

 sis, Bunge. — 5, Flower (after K. Schumann). 



Plate 4. — Eulyceinia: Cereus breviflorus K. Sch. — 1, Flower, longi- 

 tudinal section, natural size (from Dr, Kuntze's specimen in the Royal 

 Herbarium at Berlin). Pilocereus: Cereus strictus P. DC. — 2, Flower 

 (after plate 3125, Botanical Magazine, as C. Boyenii). — Cereus Iloulletii 

 A. Berg. — 3, Flower, longitudinal section (after K. Schumann). 4, Fruit, 

 reduced (after Rumpler). — Cereus lanuginosus Mill. — 5, Seeds, natural 

 size and enlarged. 



Plate 5. — Piptanthocereus : Cereus spec? (C. validus Haw.?). 

 Plant in the garden at Monte Carlo. 



Plate G. — Piptanthocereus: Cereus spec? (<7. validus Haw.?). 

 1, Flower, closed, X 3 / 5 - 2 > Fruit, with spines from the stem attached, 

 X 3/5. 3, The same, longitudinal section. 4, Seeds, X 3 / 5 > an( * enlarged. 

 From Monte Carlo. 



Plate 7. — Piptanthocereus : Cereus Pitahaya DC. — 1, Sterile fruit, 

 with spines from the stem attached, natural size (from L. Winter's gar- 

 dens, at Bordighera). — Cereus spec? (C. Jarnacaru DC.?). — 2, Fruit, 

 natural size. 3, The same, longitudinal section. 4, Seeds, natural size 

 and enlarged. Eriocereus : C. pomanensis Web. — 5, Fruit, natural 

 size. 6, Seeds, natural size, and enlarged. All from La Mortola. 



Plate 8. — Trichocereus: Cereus strigosus Salm. — 1, Flower, natural 

 size. — Cereus Spachianus Lem. — 2, Fruit, natural size. 3, Seeds, natural 

 size, and enlarged. From La Mortola. Lophocereus : Cereus Schottii 

 Engelm. — 4, Flower, natural size. 5, Ovary and base of tube, showing 

 insertion of stamens, natural size. 6, Fruit, natural size (4, 5, 6 from 

 specimens collected by Pringle, in the RoyaJ Herbarium at Berlin). 7, 8, 

 Seeds, natural size and enlarged. 



Plate 9. — Eriocereus: Cereus tortuosus. — 1, Flower, natural size. 

 From La Mortola. Cleistocactus : Cereus Baumannii Lem, — 2, Fruit, 



