302 CACTE^. 



10. R. Swartariana, T/eiff. Stem simply branched, winged above : summit resembling 

 the branches : branches alternate, flat, oblong or oblong-linear, remotely crenate, tapering at 

 the stipitate, jointed base ; flowers minute, whitish ; berry nearly black. — Regensb. Ft. 1853, 

 t. 6./. 18. — Cactus alatus, Sw. — Variable in the length of the winged part of the stem, the 

 form of the branches, and their margins regularly crenate or subserrate. Stem l'-2' high, 

 cylindrical below : branches 6"— 12" long ; flowers 4"' diatn. ; berry ovoid-globose, 4'" long : 

 seeds numerous, smooth, obovoid-globose, pointed at the base -. embryo annular, with obsolete 

 albumen.— Hab. Jamaica I, WullscJil., on trees. 



11. R. Cassytha, G. Stem and whorled or opposite branches cylindrical, jointed, 

 pendulous : branchlets blunt at each end : areola; distant, glabrescent ; flowers minute, 

 whitish ; berry whitish. — Tuss. Fl. 3. t. 22. — Cactus parasiticus, L. (ex syn. SI.). C. pen- 

 dulus, Sw. — 1'-6' long : ultimate branchlets about 3" long ; flowers 2'" diara. ; berry ovoid- 

 globose, 2"'-3'" long. — Hab. Jamaica !, Wullschl., on trees ; Trinidad !, Cr. ; [Cuba ! and 

 Mexico to Guiana]. 



7. OPUNTIA, T. 



. Calyx-tube equalling the ovary, scaly with caducous, exterior sepals. Berry naked. Seeds 

 compressed : cotyledons curved around the albumen. — Stem or branches jointed, tubercled. 



Sect. 1. Platyopuntia. — Stamens exceeded by the corolla, nearly equalling the style. 

 Embryo spirally convolute around scanty albumen. — Stem-pieces or branches flat : tuber- 

 cles bearing bristles, down, and usually spines in the axils of abortive leaves : flowers 

 lateral. 



12. O. Tuna, Mill. Erect, proliferous-jointed ; stem-pieces oval : areola distant, 5-4 

 (&-1) -spinose: spines stout, unequal, spreading, flavescent ; flowers yellow; calyx-tube 

 obovate.— Tuss. Fl. 2. t. 31 I)esc. Fl. 7. t. 516.— Cactus, L.— 3'-4' high; stem-pieces 

 4"-8", longest spines 1"-1 4" long ; flowers 3"-4" diam. — Hab. Jamaica (Mac/.), common 

 on dry soil; Antigua!, Wullschl. 



13. O. Picus-indica, Mill. Erect, proliferous-jointed ; stem-pieces thickish, obovate i 

 areola distant, not spinose, (rarely with minute, solitary spines) ; flowers yellow ; calyx-tube 

 clavate. — Tuss. Fl. 2. t. 34. — Cactus, L. C. Pseudotuna, Mac/, (non Sa/m.). — 4'-6' high ; 

 stem-pieces 4"-18" long ; flowers 3"-4" diam. — Hab. Jamaica (Mac/.), near Kingston ; 

 [trop. America]. 



14. O. triacantha, Haw. Erect, proliferous-jointed ; stem-pieces oval-oblong : areola 

 -3 (4-1) -spinose : spines stiff, divaricate-spreading, or sabreflexed, whitish, superior long, 

 often twice as long as the 2 inferior ones ; flowers reddish ; calyx-tube broadly turbinate. — 

 Cactus, W. — Stem-pieces horrid with spines : spines mnch thiuner than in O. Tuna, longest 

 li"-2" long; flowers 1" diam. — Hab. Antigua !, Wullschl., near the coast of Gracebay. 



15. O. spinosissima, Mill. "Stem columnar, continuous, densely spinose, with 

 pendulous jointed branches ; branch-pieces elongated, oblong-linear : areola approximate, 

 &-4-spinose : spines long, rigid, needle-shaped ; flowers reddish-orange" (Mat/.)— SI. t. 224. 



/. 2. — Cactus, W. — " Stem thick, branched 4-5' from the ground ; branch-pieces about 1' 

 long; longest spines upwards of 2" long; flowers 1" diam." — Hab. Jamaica (Mac/.), com- 

 mon in the dry, southern savannahs 



Sect. 2. Nopalea. — Stamens exserted, shorter than the style. — Habit of Flatyopuntia, but 

 tubercles usually unarmed with spines. 



16. O. coccinellifera, Mill. Erect, proliferous-jointed; stem-pieces obovate-oblong : 

 areola very distant, at length unarmed, bearing short wool and bristles ; flowers crimson ; 

 calyx-tube obovate. — Desc. Fl. 7- t. 516. — Cactus, L. — The areolse at the summit of a 

 young specimen bear single, recurved, small spines ; areolae at length 1" distant from each 

 other; flowers not expanded, IV diam. ; ovary 1£"-1", stamens 12"'-15"' long. — Hab. 

 Jamaica !, Wullschl., common on dry soil ; [Mexico]. 



8. PEIRESCIA, Plum. 

 Calyx-tube equalling the ovary, usually leafy by the exterior sepals. Berry naked at the 



