STANDLEY TREES AND SHRUBS OF MEXICO. 1011 



Described as with the habit of Epiphi/Uum laiifrons but with different 

 flowers, these delicately fragrant ; flower tube 12 to 15 cm. long, bearing 

 small spreading rose-colored scales ; outer perianth segments rose-colored to 

 reddish green, the inner white, elongate, linear (7 to 8 cm. long, 4 to 7 mm. 

 broad), spreading or recurved; stamens somewhat exserted ; style slender, 

 pink or purplish ; stigma lobes 12 to 14, yellow. 



HYBRID SPECIES. 



Epii'hyllum ackermannii Haw. Phil. Mag. 6: 109. 1829. 



PJijjUocactus ackermannii Lindl. in Edwards, Bot. Reg. 16: pJ. 1331. 1830. 



Mexico. 



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

 bristly or with weak spines, especially on the young growth ; flowers day-bloom- 

 ing, very large, sometimes 15 to 20 cm. broad, crimson ; inner perianth seg- 

 ments oblong, acute ; filaments long, weak, declined ; style more or less de- 

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



Tliis species is commonly grown in hothouses. It is believed to be of hybrid 

 origin. 



52. CHI AP ASIA Britt. & Rose, Cactaceae 4: 203. 1923. 



The genus consists of a single species. 



1. Chiapasia nelsonii Britt. & Rose, Cactaceae 4: 203. 1923. 



Epiphyllum nelsonii Britt. & Rose, Contr. U. S. Nat. Herb. 16: 257. 1913. 



Phyllocactus nelsonii Vaupel, Monatsschr. Kakteenk. 23: 116. 1913. 



Phyllocactus chiapensis Purpus, Monatsschr. Kakteenk. 28: 118. 1918. 



Chiapas, the type from Chicharras. 



Branches 60 to 120 cm. long, slender and terete below, flat and thin above, 

 3 to 4 cm. broa-a, the margin low, crenate; flowers light rose-red, the tube 

 2 to 3 cm. long, the segments about 6 cm. long, narrow, acute. 



53. NOPALXOCHIA Britt. & Rose, Cactaceae 4: 204. 1923. 

 The genus consists of a single species. 



1. NopalxocMa phyllanthoides (DC.) Britt. & Rose, Cactaceae 4: 205. 1923. 



Cactus phyllanthoides DC. Cat. Hort. Monsp. 84. 1813. 



Cactus speciosus Bonpl. Descr. PI. Rar. 8. 1813. Not C. speclosus Cav. 1803. 



Cactus elegans Link, Enum. PI. 2: 25. 1822. 



Epiphyllum phyllanthoides Sweet, Hort. Brit. 172. 1826. 



Phyllocactus phyllanthoides Link, Handb. Gewiichs. 2: 11. 1831. 



Supposed to be a native of Mexico or Colombia, but known only from 

 cultivated plants ; commonly cultivated in Mexico. 



Stems somewhat woody, branching, tlie branches terete at base, flattened and 

 thin above, sometimes 5 cm. broad, green ; margin of branches coarsely crenate ; 

 flowers diurnal, rose or red, the tube 2 cm. long ; inner perianth segments 

 oblong, more or less spreading ; filaments and style elongate, slender ; stigma 

 lobes 5 to 7. " Nopalillo," " Marta." 



54. RHIPSALIS Gaertn. Fruct. & Sem. 1: 137. 1788. 



Plants sometimes growing in humus but usually epiphytic and hanging from 

 trees, sometimes erect, sometimes clambering over rocks, more or less rooting 

 or, when hanging, irregularly producing aerial roots ; stems usually much 

 branched (often hetei-omorphic), terete, angled, or much flattened and leaflike, 

 very slender and threadlike or stout and stiff ; leaves wanting or represented 



