Tap. 82777. 
CEREUS amecaMEnsis. 
Mexico. 
CACTACEAE. 
Cureus, Haw.; Benth. et Hook, f. Gen. Plant, vol. i. p. 849. 
Cereus amecamensis, //eese ea: Rother in Praktischer Ratgeb. vol, xi. p. 442, 
eum i¢.; species 0. speciosissimo, DC. valde aftinis, sed caulibus apice 
ecles CU. 
iridibus et floribus albis differt. 
succulenta, basi ramosa. Rumi elongati, erecti, proaients vel 
penduli, acute 3-5-angulati, 1-5-3 em, crassi, pallide virides, angulis leviter 
dentato-sinuatis et pulvinis albo- vel griseo-tomentosis. Spinae 11-15, 
tenues, aciculares, 7-14 mm. longae, primum albae, demum brunneac, 
Flores magni, 15-17 em. diam., albi, late infundibuliformi-campanulati, 
tubo supra ovarium perbreve. Sepala anguste lanceolata, acuta, interiora 
7-8 cm. longa, exteriora multo minora, pallide viridia. Peta/a 2-3-seriata, 
9-10 em. longa, 2°5 cm. lata, lanceolata vel anguste oblongo-lanceolata, 
obtusa vel subacuta, alba. Stamina numerosa, filamentis albis, antheris 
pallide luteo-albis. Ovarium 4 em. longum, spinosum et squamosum, 
Stigmata 6-10, pallide luteo-alba.—Cereus amecaeneis, Heese in Hesdorf. 
Monatsheft. Blum.-Gartenfr. vol.i, p. 317 ; K. Schum. Monogr. Cact. p. 154.— 
N. E. Brown. 
The fine species here figured in general character 
resembles the well-known and brilliantly coloured Cereus 
speciosissimus, to which our plant is indeed very closely 
allied. The stems of the two are similar in appearance, 
though those of C. speciosissimus are mostly 3—4-angled, 
whereas in our plant, while the more erect stems are 
3—4-angled, those that grow more or less horizontally are 
often, at least in part, 5-angled, and the growing shoots do 
tt show the dal purplish tinge at the tips which 
characterise those of C. speciosissimus. In our plant, 
- moreover, the flowers are pure white. C. amecamensis is a 
native of Mexico, where it was discovered by Mr. E. Heese 
on Iztaccihuatl Mountain, near Amecameca, growing as an 
epiphyte in the upper Fir-tree region, at about 7,800 ft. 
above the level of the sea. For its cultivation C. ameca- 
mensis requires the treatment suitable for Phyllocacti; an 
abundance of heat and moisture with ample sunshine in 
summer, and dryness near the root in winter. The large 
OctopEr, 1909. 
