234 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



DOUBTFUL SPECIES. 



LOEAMHUS iNTERKUPTUs H. B. K. Nov, Gen. & Sp. 3: 440. 1817. Type from 

 Ario, Michoacan, 



LoRANTHUs TEHUACANENsis Oliver, Nat. For. Kjobenhavn Vid. Medd. 1864: 

 171. 1864. Described from Teliuacan. P\iebla ; reported from Oaxaca, Tabasco, 

 ana Guatemala. Perhaps of the genus Oryctanthus. 



Struthanthus selerokum Loes. Bull. Herb. Boiss. 2: 536. 1894. Type from 



Matlatengo, Hidalgo. 



I 

 6. PHRYGILAISTTHUS Eichl. in Mart. Fl. Bras. 5': 45. 1868. " 



Plants glabrous, parasitic on dicotyledonous hosts, the branches terete; 

 flowers large and showy, solitary or cymose. 'gj 



Leaf blades linear or terete 1. P. sonorae. 



Leaf blades broadly spatulate-obovate 2. P. palmeri. 



1. Phrygilanthus sonorae (S. Wats.) Standi. Contr. U. S. Nat. Herb. 20: 212. 



1919. 



Loranthus sonorae S. Wats. Proc, Amer. Acad. 24: 73. 1889. 



Baja California and Sonora ; parasitic on Elaphrium microphyUiim ; type 

 from Guaymas. 



Plants glaucous, much branched ; leaves slender, 4 to 6 mm. long ; flowers 

 bright red, 4 cm. long. " Ingerto " (Baja California). 



2. Phrygilanthus palmeri (S. Wats.) Engl, in Engl. & Prantl, I'flanzenfam. 



Nachtr. 1: 134. 1897. 



Loranthus palmeri S. Wats. Proc. Amer. Acad. 21: 438. 1886. 



Chihuahua to Jalisco and Puebla, on species of Elaphrium; type froiu Ha- 

 cienda San Miguel, Chihuahua. 



Plants green, with stout reddish brown branches ; leaves 2 to 2.5 cm. long, 

 petiolate, rounded at apex ; flowers red, almost 4 cm. long. 



7. PSITTACANTHUS Mart. Flora 13: 106. 1830. 

 Parasites, usually upon dicotyledonous plants, with green leaves ; flowers 

 large, cymose or corymbose. 



A plant of the family Loranthaceae and probably of this genus, growing on 

 the Pico de Orizaba, is said to be known locally as " planta quebradora." The 

 species of Psittacanthns (Greek for "parrot-flower") have more showy flowers 

 than the Mexican representatives of other genera of the family. 



Perianth velutinous 1. P. mexicanus. 



Perianth glabrous. 

 Branches all terete, or nearly so. 

 Anthers 5 to 6 mm. long; leaves cordate-clasping, glaucous. 



2. P. auriculatus. 



Anthers about 18 mm. long; leaves obovate-elliptic 3. P. macrantherus. 



Branches usually quadrangular, at least more or less angnlate. 



Flowers 6.5 to 8 cm. long ; leaves attenuate 4. P. schiedeanus. 



P^lowers 3 to 5 cni. long. 



Buds terete ; perianth lobes dilated ; leaves ovate or broadly cordate. 



obtuse 5. P. karwinskyanus. 



Buds clavate ; perianth lobes linear ; leaves never cordate. 

 Leaves usually falcate or very oblique, attenuate to the apex. 



6. P. calyculatus. 

 Leaves not falcate, rounded or very obtuse at the apex. 



7. P. americanus. 



