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SELENICEREUS. 



207 



we have obtained but one flower. It grc 

 soon reaching the top of the greenhouses, 

 these soon fall. Toward the last of 



J off many ] 

 made small 



May 191 8, plants in Washingt 



numerous flower-buds and gave every promise 

 spell occurred the first of June when the thermometer 

 Fahrenheit, and all the buds but one were killed. The f 

 conditions. Now that we have studied a mature flower 



114 



re similar 

 segments. 



long with the typical forms. The flower-bud 

 The flower itself in its bell-shaped perianth of 



resembles verv much 



very 



terminal 



Selenicereus 



Cereus spinulosus De Candolle, Mem. Mus. Hist. Nat. Paris 17: 117. 1828. 



1909 



roots 



light green, somewhat shining, usually angled but sometimes nearly terete ; ribs 4 to 6, or some- 

 times more ; spines very short, yellowish or becoming blackish ; radial spines 5 or 6, with 2 reflexed 

 bristles at the base of the areole; central spine i, rarely 2, on juvenile branches more numerous and 

 more acicular, white; flower 12 to 14 cm', long; its tube about 5 cm. long, with a few clusters of small 

 spines; outer perianth-segments narrowly oblong, 5 to 6 cm. long, acute, spreading; inner perianth- 



segments 



ovary covered with clusters of spines similar 



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Fig. 286. — Selenicereus spinulosus. Xo.66. 



Type locality: Mexico. 



Distribution: Eastern Mexico to southeastern Texas. 



Illustration: Bliihende Kakteen i: pi. 53, as Cereus spinulosus. 



Plate XXXVIII, figure 2, shows a flowering branch of a specimen obtained by Dr. Rose 

 from Texas in 1900, which flowered in the New York Botanical Garden, April 9, 191 2. 

 Figure 286 shows a growing shoot from a plant obtained by Dr. K. Palmer at Victoria, 

 Mexico, in 1907. 



15. Selenicereus inermis (Otto). 



Cereus inermis Otto in Pfeiffer, Enum. Cact. 116. 1837. 



Cereus karstenii Salm-Dyck, Cact. Hort. Dyck. 1849. 218. 1850. 



Creeping or clambering over rocks and bushes, deep green, the branches i to 2.5 cm. thick, 3 to 

 5-ribbed or angled, the ribs compressed, acute, undulate; old branches naked but young branches 

 bearing setae from the small areoles; areoles remote, sometimes 6 cm. apart, when young each borne 



before 



sesnnents 



to 10 mm. broad, yellowish green, but more or less purplish at base; inner perianth-segments oblong, 

 8 to 9 cm. long, pure white except the pinkish bases; filaments numerous, slender, weak, white; style 

 very thick, hollow, 7 mm. in diameter, pinkish, 15 cm. long; stigma-lobes numerous, greenish, 12 

 mm. long; flower-tube green, 8 cm. long, cylindric, i .5 cm. in diameter, bearing a few scattered areoles, 



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