ORDER 68. UMBELLIFERdS. 133 



3. PHYLLOCACTUS PHYLLANTHOIDES. Stock consisting of narrow, 

 ensiform, crenate joints, fleshy but leaf-like. Flowers 4' long, open by day, with many 

 rose-colored petals and sepals longer than the tube, gradually spreading. Mexico. 



2 P. ACKEUMANNI. Fls. scarlet ; pet. channelled, pointed, very many, 3-4'. Mexico. 



3 P. PHYLLANTHUS. Splcenwort. Joints eneiform, serrate; fls. 9 12', the white fun- 



nel-form cor. much shorter than the slender tube, opening by night, fragrant. S. Am. 



4. CEREUS, DC. Sep. and pet. imbricated, adnate to and prolonged 

 into a long tube above the ovary. Sta. and style filiform, adnate to the 

 tube. Stig. 10. Berry scaly with the remains of the sepals. J> *> Stock 

 fleshy, green, prismatic, often jointed, with fascicles of spines on the ridges. 



1 C. GRANDIFLORUS. Night-blooming O. Stock long, about 5-angled ; flowers very large, 



nocturnal ; pet. spreading 6 8', pearl-white ; sep. yellow. Mex. A magnificent flower. 



2 C. TRIANGULARIS. Stock 3-angled, prickles bristly ; fl. very large, white ; sep. green. 



3 C. FLAGELLIFORMIS. Stock slender, long, prostrate, 10-a.ngled, hispid ; fls. pink-color, 



smaller, open by day many days in succession ; tube longer than the petals. 



4 C. SEKPENTINUS. Stock 12-angled, 4f ; spines white, bristly ; fls. pale, open by night. 



5 C. spEciosfssmus. Stock 3- or 4-angled, erect, 4f ; angles winged, undulate ; fls. large 



(4' long), with many red or crimson petals and white stamens, diurnal. Common. 



6 C. SENILIS. Old- Man C. Stk. erect, oblong, with tufts of long, white, hair-like bristles. 



5. MELOCACTUS COMMUNIS. Stock very succulent, roundish ovate, 

 If, 12-lS-ribbed, surmounted by a sort of spadix, consisting mostly of dense wool, in 

 which at the top the small red flowers are imbedded. W. Indies. 



ORDER LXI. FICOIDE^E. MESEMBRYANTHS. 



Plants fleshy, of forms variously singular, with entire, mostly opposite 

 leaves, and solitary, regular flowers, remarkable for their profusion and 

 duration. Calyx lobes 4 or 5. Petals oo 5, or rarely 0. Stamens oo, dis- 

 tinct, perigynous. Ovary more or less adherent. Stigmas 2 oo. Cap- 

 sules 1- oo-celled, co-seeded. Embryo curved. 



Petals and stamens oo, in several rows. Capsule fleshy, valvate MESEMBRTANTHBMTTM. 1 



Petals none, stamens 005. Capsule 3-celled, circumsessile SESUVIUM. .2 (& p. 446) 



1. MESEMBRYANTHEMUM, L. ICE PLANT. Calyx lobes 5. Pet. 

 linear, inserted with the filiform stamens on the calyx tube. 1$. 5 Air bub- 

 bles beneath the epidermis appear like dew or frost. 



1 Itt. CRYSTALLINUM. Procumbent, fleshy ; Ivs. large, ovate, acute, wavy at the margin, 



3-veined beneath. 11 Greece. Stem If. Flowers white, all summer. Not hardy. 



2 OT. GRANDIFLORUM. Procumb. ; Ivs. cord, ovate ; cal. 4-cleft, 2-horned ; pet. pink. Afr. 



2. SESUVIUM, L. SEA PURSLANE. Sep. 5, united at base, colored 

 Inside. Sta. 5 50, inserted on the calyx tube. Ov. free, 3-5-celled. Sty. 

 3 5. Pyxis opening transversely by a lid. if Prostrate sea-side herbs. 



S. Portulacustrnm Tourn. Lvs. linear-spatulate ; fls. on short peduncles ; sta. co- 

 Sandy coasts, N. C. toFla. lf+. Plant very smooth and fleshy. Pis. axil., roseate. J1.+. 



ORDER LXIII. UMBELLIFER^E. UMBELWORTS. 

 Herbs with hollow, striate stems, sheathing petioles, and flowers in urn- 



