302 CACTEiE. 



10. R. Swartziana, Tfeiff. Stem simply branched, winged above : summit resembEng: 

 the branches : Iranches alternate, _/?a<, oblong or oblong-linear, remotely erenate, tapering at 

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

 t. 6'./. 18. — Cactus alatua, Sw.-^ Variable in the length of the winged part of the stem, the 

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

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

 seeds numerous, smooth, obovoid-globoae, pointed at the base : embryo annular, with obsolete 

 albumen. — Hab. Jamaica 1, Wullschl., on trees. 



11. B. Cassytha, G. Stem and whorled or opposite iranches cylindrical, jointed, 

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

 whitish ; berry whitish. — Tuss. Fl. 3. t. 22.-7-Cactus parasiticus, L. {ese syn. SI.). C. pen- 

 dulus, Sio. — 1'-6' long : ultimate branchlets about 3" long ; flowers 3'" diam. ; berry ovoid- 

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

 Mexico to Guiana]. 



7. OPUNTIA, T. 



Oalyx-iube equalling the ovary, scaly with caducous, exterior sepals. Berry naked. Seeds 

 compressed: cotyledons curved around the albumen. — Stem or \iTau-aches jointed, tubercled. 



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

 Mmbryo 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, MiU. Erect, proliferous-jointed ; stem-pieces oval : areola distant, 5-4 

 (6-l)-«pmoje; sjdnes stoat, unequal, spreading, ^a»«jceBi,- flowers yellow; calyx-tube 

 ohovate.— 2ksx. M. 2. t. 31 Besc. PI. 7. i. 516.— Cactus, Z.— 3'-4' high; stem-pieces 

 4"-8", longest spines 1"-14" long; flowers 3"-4" diam,- — Hab. Jamaica (Maef,), common 

 on dry soil; Antigua I, Wullschl. 



13. O. Ficus-iudica, .^sV;. Erect, proliferous-jointed ; stem-pieces thickish, obovate : 

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

 cla.va.tB.— Tuss. Fl. 2. t. 34.— Cactus, L. C. Pseudotima, Mac}", {non Salm.). — 4'-6' high ; 

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

 [trop. America]. 



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

 -Z{.4t-\)-sp,nose : spines s\iS, divaricate-spreading, or subreflexed, 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 much thinner than in 0. Tuna, longest 

 14''-2" long ; flowers 1" diam. — Hab. Antigua !, Wullschl., near the coast of Gracebay. 



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

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

 S-4i-spinose ; spines long, rigid, needle-shaped ; flowers reddish-orange" {Macf.) — 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 (Macf.), com- 

 mon in the dry, southern savannahs. 



Sect. 2. NoPAlEA. — Stamens earserted, sliorter than the style. — Habit of Platyopuntia, but 

 tubercles usually unarmed with spines. 



16. O. coccinellifera, .^27^. Erect, proliferous-jointed j stem-pieces obovate-oblong : 

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

 calyx-tube obovate.— i)e«o. Fl. 7. t. 516.— Cactus, i.— The areolae at the summit of a 

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

 other ; flowers not expanded, \\" diam. ; ovary 14"-1", stamens 12"'-15"' long. — Hab. 

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



8. PEIRESCIA, Plum. 

 Cahjx-tuhe equalling the ovary, usually leafy by the exterior sepals. Berry naked at the 



