CACTUS FAMILY 167 
with about 8 petals. Fruit about 1 in. long, crimson when ripe, eat- 
able. Dry rocks and sandy ground, from Massachusetts south along 
~ the coast. 
2. O. Rafinesquii Engelm. Prostrate, green. Leaves }-} in. long, 
awl-shaped, spreading; bristles often intermixed with a few small 
spines and a larger one #—-1 in. long. Flowers larger than in No. 1 
and with 10-12 petals. Fruit about 1} in. long, much tapered at the 
base. In poor soil. 
3. O. polyacantha Haw. Prostrate, light green. Leaves very small, 
with bristles and 5-10 spines in their axils. Flowers 2-3 in. in diam- 
eter. Fruit dry and spiny. Wisconsin, 8. and W. 
Il. PHYLLOCACTUS Link. 
Stems cylindrical when old, with long, flattened, fleshy but 
leaf-like, sinuate or serrate branches. Flowers nearly or quite 
reeular, from the notches in the margins of the joints. 
1. P. Ackermanni Solm. D. Flowers very showy, bright red. 
Perianth tube shorter than the petals. Sepals scattered, small and 
bract-like. Petals many, 2-3 in. long, widely spreading, somewhat 
channeled, sharp-pointed. Cultivated from Mexico. 
Il. CEREUS L. 
Stem more or less prismatic but strongly ridged, with bun- 
dles of spines borne on the ridges ; sometimes prostrate or trail- 
ing, sometimes erect, columnar, and 50 or 60 ft. high. Flowers 
usually showy, borne on the sides of the stem, generally with 
a rather long perianth tube, which is covered outside with scale- 
like sepals. usually with tufts of wool in their axils. Petals 
many, mostly long and spreading. 
1. C. speciosus K. Sch. Stems 2-3 ft. high. with 5-4 broad-winged 
and sinuate ridges. Flowers open in the daytime and lasting several 
days, red or crimson, very showy. Petals longer than the tube, stamens 
white, drooping. very numerous. Commonly cultivated from Mexico. 
2. C. grandiflorus Mill. Nicgut-BroominG Cerevs. Stems long, 
climbing by aérial roots, nearly cylindrical, but with 5 or more blunt 
angles. Flowers very showy, opening only for one night, wilting early 
in the morning, extremely fragrant. Sepals dull yellow. Petals pearly 
white. spreading, 6-8 in. long. Cultivated from Mexico. 
