Phthirusa Mart., Flora 13: 110--111. 1830.
Synonymy: Phthirusa Sect. Euphthirusa Engler, Die Nat. Pflanzenfam, ed. 1, 3(1): 181. 1889.
Ixocactus Rizz., Arq. Jard. Bot. Rio de Janeiro 12: 118. 1952.♦
Generic literature: Kuijt, J. The genus Ixocactus (Loranthaceae, s.s.): description of its first species.
Brittonia 19: 62--67. 1967.
Kuijt, J. 1991b. Two new species of Ixocactus (Loranthaceae) and a reformulation of
the genus. Syst. Bot. 16: 292--298.
Kuijt, J. Pulling the skeleton out of the closet: resurrection of Phthirusa sensu Martius
and consequent revival of Passovia Karsten (Loranthaceae). Pl. Div. Evol. 129: 159-
-211. 2011b.
N.B. For Phthirusa in the Eichlerian sense, see also under Passovia.
abdita Moore = Passovia pedunculata (Jacq.) Kuijt, ined.♦
adenostemon Eichler = Passovia pedunculata (Jacq.) Kuijt, ined.♦
adenostemon Eichler var. huberi Rizz., non Phthirusa huberi Rizz. = Passovia pedunculata (Jacq.) Kuijt.♦
adunca (Meyer) Maguire = Passovia pedunculata (Jacq.) Kuijt.♦
adunca (Meyer) Maguire var. magdalenae (Cham. & Schlechtend.) Rizz. = Passovia pedunculata (Jacq.)
Kuijt.♦
adunca (Meyer) Maguire var. magdalenae (Cham. & Schlechtend.) Rizz. f. magnifolia Rizz. = Passovia
pedunculata (Jacq.) Kuijt.♦
adunca (Meyer) Maguire var. orinocensis (Sprengel) Steyerm. = Passovia pedunculata (Jacq.) Kuijt.
alata (Tiegh.) Engler = Dendropemon alatus Tiegh.♦
alternifolia Eichler = Cladocolea alternifolia (Eichler) Kuijt.♦
amazonensis Weir = Passovia pedunculata (Jaq.) Kuijt.♦
anastyla Rizz. in Luces de F. & Steyermark (eds.), Fl. Ven. 69--70. 1982. Unresolved.
angulata Krause, Rec. Trav. Bot. Néerl. 22: 344. 1925 = Passovia pedunculata (Jacq.) Kuijt.?
badilloi Ferrari = Maracanthus badilloi (Ferrari) Kuijt.♦
bauhiniae Moore, Trans. Linn. Soc. London, ser. 2, 4: 451. 1894--1896. ♦
bernardiana Rizz. = Passovia santaremensis (Eichler) Tiegh.♦
bicolor (Krug & Urban) Engler = Dendropemonbicolor Krug & Urban.♦
bisexualis Rizz. = Passovia bisexualis (Rizz.) Kuijt, comb. ined.♦
bistriata Urban = Dendropemon oliganthus Urban.♦
brachystachya Diels, Notizbl. Bot. Gart. Berlin-Dahlem 14: 30. 1938. Unresolved; = Peristethium sp.?
brasiliensis Weir = Passovia pyrifolia (Kunth) Tiegh.♦
caatingae Rizz. = Pusillanthus pubescens (Rizz.) Caires.
calloso-albida Rizz. = Passovia santaremensis (Eichler) Tiegh.♦
caribaea Engler = Dendropemon caribaeus Krug & Urban.♦
castillana Rizz. = Cladocolea micrantha (Eichler) Kuijt.
caucana Eichler, nom. illeg. (“pro tempore”) = Passovia pedunculata (Jacq.) Kuijt.
clandestina (Mart.) Mart., Flora 13: 110. 1830.
Basionym: Loranthus clandestinus Mart., in Schult. & Schult. f., Syst. Veg. 7: 96. 1829.
Synonymy: Cladocolea clandestina (Mart.) Kuijt, J. Arnold Arb. 56: 280--282. 1975a.
Ixocactus clandestinus (Mart.) Kuijt, Syst. Bot. 16: 297. 1991b.
Icon.: Eichler 1868: Fig. 18; Kuijt 1975a: 280 (Fig. 6) = Kuijt 2011b (2012): 163 (Fig. 1).
coarctata A.C. Smith = Passovia coarctata (A.C. Smith) Kuijt. ♦
cochliostyla Ule ("cochliostachya", sphalm., in Rizzini 1956: 123) = Passovia pedunculata (Jacq.) Kuijt.
constantiae (Krug & Urban) Engler = Dendropemon constantiae Krug & Urban.♦
cothurnata Rizz. = Passovia pedunculata (Jacq.) Kuijt.♦
delicatula Rizz., Rev. Brasil. Biol. 47: 456. 1987. Unresolved.
disjectifolia (Rizz.) Kuijt = Passovia disjectifolia (Rizz.) Kuijt.♦
domingensis (Desv. in Ham) Eichler = Phoradendron trinervium (Lam.) Griseb.♦
elliptica Rizz., Dusenia 3: 456--457. 1952 = Unresolved.
elongata Gleason = Passovia pedunculata (Jacq.) Kuijt.♦
emarginata (Swartz) Steudel/Eichler var. brachycarpa (Krug & Urban) Urban = Dendropemon
loranthoideus (Baill.) Tiegh.♦
erythrocarpa Mart. = Passovia pedunculata (Jacq.) Kuijt.♦
exilis Kuijt, Pl. Div. & Evol. 129: 164. 2011 (2012).
Synonymy: Ixocactus gracilis Kuijt, Syst. Bot. 16: 292--294. 1991b.♦
Icon.: Kuijt 1991b: 293 (Fig. 1) = Kuijt 2011b: 165 (Fig. 2).
glandulosa Rusby ex Kunth, Rep. Sp. Nov. Regni Veg., Beih. 43: 302. 1927, nom. nud.♦
gonioclada A.C. Smith = Phthirusa pedunculata (Jacq.) Kuijt.♦
gracilis Gleason = Struthanthus gracilis (Gleason) Steyerm. & Maguire.♦
guyanensis Eichler = Passovia santaremensis (Eichler) Tiegh.♦
harrisii (Urban) Fawcett & Rendle = Dendropemon pauciflorus (Swartz) Tiegh.♦
heterophylla Rusby = Passovia pyrifolia (Kunth) Tiegh.♦
hippocrateoides Steyerm. & Maguire = Struthanthus syringifolius (Mart.) Mart.?♦
huberi Rizz., Ernstia 24: 17--18. 1984.♦
hutchisonii (Kuijt) Kuijt, Pl. Div. Evol. 129: 166--168. 2011b.
Synonymy: Ixocactus hutchisonii Kuijt, Brittonia 19: 62--67. 1967.
Icon.: Kuijt 1967: 63 (Fig. 1) = Kuijt 1986: 118 (Fig. 1); Kuijt 1987a: 457 (Fig. 6b, seedling); Kuijt
2011b: 167 (Fig. 3).
inconspicua (Benth.) Eichler in Mart., Fl. Brasil. 5(2): 67. 1868.♦
Basionym: Loranthus inconspicuus Benth., Bot. Voy. Sulphur 102. 1844 [1845].
Synonymy: Struthanthus inconspicuus (Benth.) Standl., Contr. U. S. Nat. Herb. 20: 212. 1919.
Cladocolea inconspicua (Benth.) Kuijt, J. Arnold Arb. 56: 301--304. 1975a.
Ixocactus inconspicuus (Benth.) Kuijt, Syst. Bot. 16: 297. 1991b.
Icon.: Kuijt 1975a: 302, 304 (Fig. 18, 19) = Kuijt 2011b: 169 (Fig. 4); Kuijt 1982: 103 (Fig.
34)(seedling).
inorna (Robins. & Greenm.) Kuijt, Pl. Div. Evol. 129: 171--172. 2011b.
Basionym: Loranthus inornus Robins. & Greenm., Amer. J. Sci. 50: 163, 164. 1895.
Synonymy: Struthanthus inornus (Robins. & Greenm.) Standl., Contr. U. S. Natl. Herb. 20: 212. 1919.
Cladocolea inorna (Robins. & Greenm.) Kuijt, J. Arnold Arb. 56: 304--306. 1975a.
Ixocactus inornus (Robins. & Greenm.) Kuijt, Syst. Bot. 16: 297. 1991b.
Icon.: Kuijt 1975a: 305 (Fig. 20) = Kuijt 2011b: 172 (Fig. 5).
intermedia Rizz., Ernstia 24: 18. 1984 = Cladocolea intermedia (Rizz.) Kuijt.♦
iodocarpa Diels = Peristethium archeri (Smith) Kuijt.♦
jamaicensis Krug & Urban= Passovia pedunculata (Jacq.) Kuijt.♦
janeirensis Eichler = Passovia santaremensis (Eichler) Tiegh.♦
krukovii A.C. Smith = Passovia pedunculata (Jacq.) Kuijt♦.
laxiflora (Desv.) Eichler = Dendropemon picardae Krug & Urban.♦
lenticellata Diels = Peristethium archeri (Diels) Kuijt.♦
lepidobotrys (Griseb.) Eichler = Passovia pyrifolia (Kunth) Tiegh.♦
lobaterae Ferrari, in Rizz., in Luces de Febres & Steyermark (eds.), Fl. Venez. 4(2): 47--49. 1982.
Unresolved.
loranthoideum (Baillon) Tiegh. = Dendropemon loranthoideum (Baillon) Tiegh.♦
macrophylla (Kuijt) Kuijt, Pl. Div.. Evol. 129: 171. 2011b.
Synonymy: Ixocactus macrophyllus Kuijt, Brittonia 46: 72--74. 1994c.
Icon.: Kuijt 1994c: 46: 73 (Fig. 1) = Kuijt 2011b: 129: 173 (Fig. 6).
maculata Rizz. = Oryctanthus phthirusoides Rizz.♦
magdalenae (Cham. & Schlechtend.) Eichler = Passovia pedunculata (Jacq.) Kuijt.♦
maritima Rizz. = Passovia pedunculata (Jacq.) Kuijt.♦
megat(h)ermica (Rizz.) Rizz., in Luces de Febres & Steyermark (eds.), Fl. Venez. 4(2): 49--51. 1982 =
Passovia sp.♦
Basionym: Phrygilanthus megat(h)ermicus Rizz., Rodriguésia 41: 13--14. 1976.
micrantha Eichler = Cladocolea micrantha (Eichler) Kuijt.♦
micrantha Eichler var. bolivariensis Rizz. = Cladocolea micrantha (Eichler) Kuijt?♦
monetaria Sandwith = Passovia pycnostachya (Eichler) Tiegh.♦
montana (Macfadyen) Engler = Dendropemon pauciflora fide Fawcett & Rendle 92. 1914.♦
murcae Rizz., Dusenia 3: 457. 1952 [as murcaei ]. Unresolved.
myrsinites Eichler = Oryctina myrsinites (Eichler) Kuijt.♦
myrsinites Eichler var. savannarum (Maguire) Rizz. = Oryctina myrsinites (Eichler) Kuijt.♦
nitens (Mart.) Eichler = Passovia nitens (Mart.) Tiegh.♦
oligantha (Urban) Urban = Dendropemon oliganthus Urban.
orbicularis (Kunth) De Wild. = Struthanthus orbicularis (Kunth) Eichler.♦
orinocensis (Sprengel) Eichler = Passovia pedunculata (Jacq.) Kuijt.♦
ovata (Pohl ex DC.) Eichler = Passovia ovata (Pohl ex DC.) Tiegh.♦
ovata (Pohl ex DC.) Eichler var. nemorosa Rizz. = Passovia ovata (Pohl ex DC.) Tiegh.♦
paniculata (Kunth) Macbr. = Passovia pedunculata (Jacq.) Kuijt.♦
papillosa Pilger = Passovia pedunculata (Jacq.) Kuijt.♦
parvifolia (Swartz) Eichler = Dendropemon parvifolius (Swartz) Steudel.♦
pauciflora (Swartz) Eichler = Dendropemon pauciflorus(Swartz) Tiegh.♦
pedicularis Rizz. = Passovia pedunculata (Jacq.) Kuijt.♦
percrassa Rizz., Ernstia 24: 18--19. 1984 = Passovia stenophylla (Eichl.) Tiegh.?
perdivergens Rizz., Ernstia 24: 19--20. 1984. Unresolved.
perforata Rizz. = Passovia santaremensis (Eichler) Tiegh.♦
phaeoclados Eichler = Passovia santaremensis (Eichler) Tiegh.♦
phaneroloma Standl. = Oryctanthus spicatus (Jacq.) Eichler.♦
picardae (Krug & Urban) Engler = Dendropemon picardae Krug & Urban.♦
pittieri Krause = Peristethium leptostachyum (Kunth) Tiegh.♦
platyclada Ule = Passovia pyrifolia (Kunth) Tiegh.♦
podoptera (Cham. & Schlechtend.) Kuijt = Passovia podoptera (Cham. & Schlechtend.) Kuijt.♦
polystachya Eichler = Passovia pedunculata (Jacq.) Kuijt, non Peristethium polystachyum (Ruiz &
Pavon) Kuijt.♦
psilobotrys (DC.) Eichler = Dendropemon purpureus (L.) Krug & Urban.♦
ptariana Steyerm. = Struthanthus syringifolius (Mart.) Mart. ♦
pterygopus (Mart.) Kuijt = Passovia podoptera (Cham. & Schlechtend.) Kuijt.♦
punctata Gleason = Passovia pedunculata (Jacq.) Kuijt.♦
purpurea (L.) Engler = Dendropemon purpureus (L.) Krug & Urban.♦
pycnophylla (Krug & Urban) Urban = Dendropemon pycnophyllus Krug & Urban.♦
pycnostachya Eichler = Passovia pycnostachya (Eichler) Tiegh.♦
pyrifolia (Kunth) Eichler = Passovia pyrifolia (Kunth) Tiegh.
pyrifolia (Kunth) Eichler var. grandifolia Eichler = Passovia pyrifolia (Kunth) Tiegh.●
pyrifolia (Kunth) Eichler var. intermedia Eichler = Passovia pyrifolia (Kunth) Tiegh.♦
pyrifolia (Kunth) Eichler var. parvifolia Eichler = Passovia pyrifolia (Kunth) Tiegh.●
retroflexa (Ruiz & Pavon) Kuijt = Passovia pedunculata (Jacq.) Kuijt.♦
rhynchophylla (Kuijt) Kuijt, Pl. Div. Evol. 129: 174. 2011b.
Synonymy: Ixocactus rhynchophyllus Kuijt, Syst. Bot. 16: 294--296. 1991b.
Icon.: Kuijt 1991b: 16: 295 (Fig. 2) = Kuijt 2011b: 175 (Fig. 7).
robusta Rusby = Passovia robusta (Rusby) Kuijt.♦
roraimensis Steyerm. = Peristethium roraimense (Steyerm.) Kuijt.♦
rostrata (Urban) Urban = Dendropemon rostratus Urban.♦
rubromicans Rizz., Ernstia 32: 10. 1985 = Passovia pyrifolia (Kunth) Tiegh.?
Icon.: Rizzini 1985: 11 (Fig. 4).
rufa (Mart.) Eichler = Passovia rufa (Mart.) Tiegh.♦
rufa (Mart.) Eichler var. tentaculifera Kuhlm. ex Rizz. = Passovia rufa (Mart.) Tiegh.♦
rufa (Mart.) Eichler var. gigantea Rizz. = Passovia rufa (Mart.) Tiegh.♦
salzmannii Eichler in Mart., Fl. Brasil. 5(2): 80. 1868. ♦
sandwithii Maguire = Cladocolea sandwithii (Maguire) Kuijt.♦
santaremensis Eichler = Passovia santaremensis (Eichler) Tiegh.♦
santessoniana Rizz., Dusenia 3: 458. 1952. Unresolved.
savannarum Maguire = Oryctina myrsinites (Eichler) Kuijt.♦
schneeana Ferrari, in Rizz. in Luces de F. & Steyermark (eds.), Fl. Venez. 4(2): 70--71. 1982.
Unresolved.
seitzii Krug & Urban = Phthirusa pedunculata (Jacq.) Kuijt.♦
siegeri Leonard = Dendropemon loranthoideus (Baill.) Tiegh.♦
sodiroi Diels, Bibl. Bot. 116: 83. 1937. Unresolved.
squamulosa Eichler = Passovia rufa (Mart.) Tiegh.♦
stelis (L.) Kuijt = Passovia pedunculata (Jacq.) Kuijt.♦
stenophylla Eichler = Passovia stenophylla (Eichler) Tiegh.♦
steyermarkiana Rizz., Ernstia 25: 10--12. 1985. Unresolved.
subcorymbosa Rizz., Ernstia 24: 20. 1984. Unresolved.
subsessilis (Urban) Urban = Dendropemon picardae Krug & Urban.♦
theloneura Eichler in Mart., Fl. Brasil. 5(2): 59--60. 1868 = Passovia theloneura (Eichler) Tiegh.
theobromae (Willd. ex Schult. & Schult. f.) Eichler = Passovia pedunculata (Jacq.) Kuijt.♦
tortuosa Smith = Passovia pedunculata (Jacq.) Kuijt.♦
trichodes Rizz. = Pusillanthus pubescens (Rizz.) Caires.
triplinervis Killip, J. Wash. Acad. Sci. 21: 348. 1931 = Phoradendron laxiflorum Ule (Viscaceae)♦; non
Phoradendron triplinervium Rizz. (Viscaceae).
uniflora (Jacq.) Eichler = Dendropemon purpureus (L.) Krug & Urban.♦
verruculosa Rizz., Rev. Brasil. Biol. 47: 456. 1987. Unresolved.
virgata (Mart.) Eichler = Passovia pedunculata (Jacq.) Kuijt.♦