RHIPSALIS. 



Key to Species — continued. 



II. All areoles with appressed bristles ig. R. aculeata 



GG. Ultimate joints 8 to 12 mm. thick. Series 6, Grandiflorae. 



Flowers 2 to 2.5 cm. broad 20. i?. grandiflora 



Flowers up to 4 cm. broad 21. R. megalanlha 



FF. Scale subtending the areole white, scarious, appressed, con- 

 spicuous. Series 7, Leucorkaphes. 



Joints 5 to 8 mm. thick; areoles with deciduous bristles 22. R. leucorhaphis 



Joints 3 mm. thick; areoles without bristles 23. R. loefgrenii 



DD. Flowering areoles large, very woolly, depressed. Series 8, Floccosae. 



Ultimate joints much shorter than others; verticillate; plants stiff. ... 24. R. neves-armondii 

 Ultimate joints not much shorter than others; plants weak. 

 Main branches stout, 8 to 10 mm. in diameter. 



Fruit pure white; Venezuelan species 25. i?. pitlieri 



Fruit red or tinged with red; Brazilian and Argentine species. 



Fruit bright red 26. R. pulvinigera 



Fruit whitish but when mature tinged with red or purple. 



Fruit 5 mm. in diameter; flowers white, becoming yellowish. . 27. R. floccosa 

 Fruit 8 to 10 mm. in diameter; flowers tinged with red, larger 



than the last 28. R. tuctimanensis 



All branches slender, 3 to 6 mm. in diameter. 



Flowers white 29. R. gibherula 



Petals with red tips ' 30, R. puniceo-disctis 



BB. Joints ribbed or angled, at least when old. 



C. Some joints bristly, others unarmed, ribbed when old. Series'), Dissimiles. . 31. R. dissimilis 

 CC. All joints unarmed, angled or winged. 

 Joints 5-angled or 5-winged. 



Joints 5-winged; wings crenate. Series 10, Penlapterae 32. R. pentaplera 



Joints 5-angled; ribs nearly continuous. Series ii, Sulcalae 33- R- sulcata 



Joints 3-angled. 



Angles of joints continuous, wingless. Series 12, Trigonae 34. R. Irigona 



Angles of joints interrupted, winged. Series 13, Paradoxae 35. R. paradoxa 



AA. At least some of joints flat, on same plant or on different plants. 



B. Joints deeply serrate; flowers nodding. Series 14, Houlletianae 36. R. houUeliana 



BB. Joints repand, entire or crenate; flowers not nodding. 



C. Joints linear to linear-lanceolate. Series i^, Lorentzianae. 



D. Joints both flat and 3-angled or rarely 4-angled, mostly narrowly linear. 

 Fruit black. 



Joints 10 mm. wide or less; fruit 5 to 6 mm. in diameter 37- R- warmingiana 



Joints 10 to 15 mm. wide; fruit about 10 mm. in diameter 38. R. gonocarpa 



Fruit white to reddish. 



Joints long-acuminate 39. R. linearis 



Joints blunt. 



Joints scarcely crenate; Ecuadorean and Peruvian species 40. R. micrantha 



Joints definitely crenate; Costa Rican species 41. R. tonduzii 



DD. All joints flat, linear-lanceolate to oblong. 



Joints deeply crenate, the lobes rounded 42. R. holiviana 



Joints repand, low-crenate, or nearly entire. 



Joints coriaceous, distinctly crenate 43. R. lorentziana 



Joints thin in texture, merely repand or iow-crenate. 



* Bolivian species 44. R. ramidosa 



West Indian and Central American species. 



Larger joints 3 cm. wide 45. R. ptirpusii 



Joints 0.5 to 2.5 cm. wide. 



Perianth-segments 7 to 8 mm. long, greenish white or pinkish 46. R. coriacea 



Perianth-segments 5 to 6 mm. long, green 47. R. jamaicensis 



CC. Joints elliptic to oblong. Series 16, Crispalae. 

 Joints thick, coriaceous. 



Joints oblong, cuneate at base. 



Flowers and fruit usually solitary at areoles 48. R. platycarpa 



Flowers several at an areole 49. R. russellii 



Terminal joints short-oblong to elliptic. 



Fruit red 50. R. elliptica 



Fruit white 51. R. pachy piers 



Joints thin. 



Brazilian species. 



Joints purplish green, obovate 52. R. rhombea 



Joints bright green or reddish. 



Joints reddish green, the margins much crisped 53. R. crispiniarginala 



Joints bright green, the margins slightly crisped. 



Ultimate joints broad, elliptic to obovate 54. R. crispata 



Ultimate joints narrow, oblong to narrowly obovate 55. R. oblonga 



Bolivian species 56. R. cuneata 



AAA. Species not grouped 57. R. roseana 



