198 THE cactaceae;. 



Illustrations: Pfeiffer and Otto, Abbild. Beschr. Cact. i: pi. 5, as Cereus hookeri; 

 Curtis's Bot. Mag. 53: pi. 2692; Loudon, Encycl. PI. 413. f. 6901, as Cactus phyllanthus ; 

 Addisonia 5: pi. 192. 



Plate XIX shows a flowering branch from a specimen sent by W. E. Broadway from 

 the Island of Tobago in 1909. 



HYBRIDS 



Epiphyllum ackermannii Haworth, Phil. Mag. 6: 109. 1829. 



Cactus ackermannii Lindley in Edwards's Bot. Reg. 16: pi. 1331. 1830. 

 \ Cereus ackermannii Otto in Pfeiffer, Enum. Cact. 123. 1837. 



Phyllocactus ackermannii SaXm-Dyck, Cact. Hort. Dyck. 1841. 38. 1842. 



Branches weak, flat, and thin with crenate margins; areoles felted, often bristly or with weak 

 spines, especially on the young growth; flowers day -blooming, very large, sometimes 1.5 to 2 dm. 

 broad, crimson ; inner perianth-segments oblong, acute ; filaments long, weak, declined; style more 

 or less declined, pinkish; stigma-lobes white; ovary more or less bristly. 



Type locality: Mexico. 



Distribution: Mexico. 



This species was originally described as from Mexican plants sent to Haworth from 

 Ackermann and, supposedly, from wild plants, but the general belief now is that the plant 

 is of hybrid origin. The flowers are so much like those of Heliocereus that this genus 

 probably furnished one of its parents (see Botanical Magazine, pi. 3598). 



On the other hand, E. A. Goldman collected in Chiapas a series of specimens which 

 seems to represent more than one species, but all the flowers are similar to those of 

 Epiphyllum ackermannii and one of the specimens may represent the wild state of that 

 species. -The plants all have flat joints bearing clusters of spines in their areoles. 



Many garden varieties and artificial hybrids have been obtained from this plant, some 

 described under English and others under Latin names. 



Illustrations: Edwards's Bot. Reg. 16: pi. 133 1, as Cactus ackermannii; Curtis's Bot. 

 Mag. 64: pi. 3598, as Cereus ackermannii; Bliihende Kakteen i: pi. 49; Cycl. Amer. 

 Hort. Baileys: f. 1773; Diet. Gard. Nicholson 3: f. 133; Karsten, Deutsche Fl. 887. f. 

 501, No. 6; ed. 2. 2: 456. f. 605, No. 6; Forster, Handb. Cact. ed. 2. 841. f. iii; Riimpler, 

 Sukkulenten 149. f. 81; Watson, Cact. Cult. 47. f. 10; Rother, Praktischer Leitfaden 

 Kakteen 97 ; ed. 3. f. 8; Amer. Gard. 11: pi. opp. 445; Gartenflora 32: 374, as Phyllocactus 

 ackermannii; Loudon, Encycl. PI. 1202. f. 17368; Encycl. Brittanica ed. 11. 4: 926. f. 3, 

 as Phyllocactus; Rev. Hort. 1861: 226. f. 44; Stand. Cycl. Hort. Bailey 2: f. 1402. 



Cactus hybridus was described and illustrated by P. C. Van Geel (Sert. Bot. i : pi. 

 115. 1832). He states that it is known in Great Britain as C. ackermannii. 

 Epiphyllum hybridum Hortus in Pfeiffer, Enum. Cact. 121. 1837. 



This was given as a synonym of Cereus speciosissimus lateritius, which is briefly 

 mentioned in volume 2 (p. 128) of this work. 



Epiphyllum jbnkensonii G. Don, Gen. Hist. Dichl. PI. 3: 170. 1834. 



Epiphyllum speciosum jenkensonii G. Don in Loudon, Encycl. PI. ed. 2. 1202. 1841. 



This plant is an artificial hybrid raised from Heliocereus speciosissimus, impregnated by the 

 pollen of Epiphyllum phyllanthoides; it has branches 3-angled at base but flattened above, with 

 areoles very prominent and spiny; flowers large, 10 cm. broad and deep scarlet; fruit nearly 

 globular, purple, 2.5 cm. in diameter, its areoles bearing a few spines and bristles. We have had it 

 to flower and fruit in cultivation. 



Epiphyllum splendidum Paxton, Mag. Bot. i: 49. 1834. 

 Cereus splendidus Steudel, Nom. ed. 2.1: 336. 1840. 

 Epiphyllum aitoni Steudel, Nom. ed. 2. i: 561. 1840. 

 Epiphyllum hitchenii Steudel, Nom. ed. 2. i: 561. 1840. 



We know this plant only from a colored illustration (Paxton, Mag. Bot. i : pi. facing 49). The 

 flower is very large, 10 inches broad, red, tinged with orange; flower- tube much shorter than limb, 

 and suggests a relationship with Epiphyllum ackermannii. Branches flat and strongly crenate. It 



