144 CACTACEA. (CACTUS FAMILY.) 
ones pinnatifid; fruit slightly roughened. — Ponds and ditches, Florida, and 
northward. July. 
4. M. scabratum, Michx. Stem short (6'—12/); leaves4-5 in a vid 
the divisions few and capillary, the floral ones linear, pectinately toothed ; fruit 
strongly ridged and roughened.— Shallow ponds, South Carolina, and north- 
ward. June and July. 
Orprer 56. CACTACEZE. (Cactus FAMILY.) 
Succulent, shrubby, and commonly leafless and. prickly plants, with 
globular, or columnar and angular, or flattened and jointed stems, and 
solitary sessile flowers. — Sepals and petals similar, imbricated in several - 
rows, and adherent to the 1-celled ovary. Stamens indefinite, with long — 
filaments, inserted on the base of the petals. Style single: stigmas nu — 
merous. Fruit baccate. Seeds numerous, campylotropous, borne on - 
several parietal placentz. Albumen scanty or none. 
1. CEREUS, Haw. 
Sepals and petals united into an elongated tube above the ovary, Stamens 
inserted on the tube. Style filiform. Stigma many-lobed. Seeds without al- — 
bumen. — Stems elongated, ribbed or angled; the angles bearing tufts of spines — 
and showy flowers. 
1. C. monoclonos, DC.? Stem tall, columnar, 6—8-angled, green; 
angles obtuse; spines short, brownish. — Key West.— Stem 49-109 high. 
Flowers 6/ long, the inner petals lanceolate, acuminate, white; the outer ones 
linear, greenish, and gradually diminishing into the scales of the tube. Stigmas 
10 or more, filiform, exserted. Stamens included. 
2. C. triangularis, Haw.? Stem elongated, jointed, 3-sided, rooting 8f 
the joints; flowers greenish externally, white within, very large; fruit large 
naked. — Key West. — Stem climbing over bushes. Joints 1° long. 
2. OPUNTIA, Tourn. PRICKLY PEAR. 
wr and petals not united into a tube. Stamens inserted into the pase of 
the petals. Style cylindrical. Stigma 3-8-lobed. Seeds with thin albumen. — 
< 2 Biens with flat or rarely cylindrical joints. Leaves fleshy, with tufts of bristly — 
hairs and commonly strong spines in their axils, deciduous. Flowers large m 
E. Ficus-Indicus, Haw. Stem erect, spreading; joints oval snd 
— leaves subulate, bristly in the axils, without spines ; fruit bristly, ob- 
n Stem prostrate ; joints obovate, cud spines few 
