232 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Branches glabrous ; flowers mostly solitary. 



Brauchlets compressed; leaves very obtuse 2. S. inconspicuus. 



Brauchlets terete: leaves acutish 3. S. inornus. 



Leaves large, 3 cm. long or often much longer. 

 Leaves abruptly acuminate at apex. 



Flowers pedicellate; perianth 4.5 to 6 mm. long 4. S. deppeanus. 



Flowers sessile ; perianth less than 4 mm. long. 



Flower clusters sessile 5. S. densiflorus. 



Flower clusters pedunculate, the peduncles swollen and reflexed in fruit. 



6. S. quercicola. 

 Leaves rounded to acute at apex, never abruptly acuminate. 



Leaf blades orbicular to elliptic, glaucescent ; inflorescence loose, elongate, 

 interrupted. 

 Style contorted ; inflorescence usually shorter than the leaves. 



7. S. venetus. 



Style straight; inflorescence longer than the leaves 8. S. hartwegi. 



Leaf blades oblong, lanceolate, linear, or oblong-obovate. 



Inflorescence pedunculate, usually 3-flowered ; leaves mostly obovate- 



oblong 9. S. diversifolius. 



^ Inflorescence sessile or nearly so ; leaves mostly lanceolate to linear. 



Leaves mostly 2.5 to 3.5 cm. wide 10. S. grahami. 



Leaves mostly 0.4 to 1.2 cm. wide 11. S. haenkeanus. 



1. Struthanthus microphyllus (H. B. K.) Don, Hist. Dichl. PI. 3: 413. 1S34. « 

 Loranthus microphyUus H. B. K. Nov. Gen. & Sp. 3: 439. pi. 300. 1818. .■ 

 Jalisco to Morelos ; type from Cuernavaca ; on Qucrcus, Solannm, etc. 



Leaves lanceolate to ovate or almost linear, acute or acutish ; flowers about 

 4 mm. long. 



2. Struthanthus inconspicuus (Benth.) Standi. Contr. U. S. Nat. Herb. 20: 



212. 1919. 

 Loranthus inconspicuus Benth. Bot. Voy. Sulph. 102. 1844. 

 Sinaloa to Guerrero ; type from San Bias, Tepic ; on Randia, etc. 

 Leaves oblanceolate or obovate ; branches greenish ; flowers minute. 



3. Struthanthus incrnus (Robins. & Greenm.) Standi. Contr. U. S. Nat. Herb. 



20: 212. 1919. 

 Loranthus inornus Robins. & Greenm. Amer. Journ. Sci. 50: 163. 1895. 

 Known only from the type locality, CuieatlSn, Oaxaca. 

 Leaves oblanceolate or subulate. 



4. Struthanthus deppeanus (Cham. «& Schleclit.) Blume; Schult. Syst. Veg. 7: 



1731. 1830. 

 Loranthus deppeanus Cham. & Schlecht. Linnaea 5: 172. 1830. 

 Loranthus liebmanni Oliver. Nat. For. Kjobenhavn Vid. Medd. 1864: 172. 



1864. V 



Veracruz ; type from Jalapa. 



Leaves ovate-lanceolate, about 7 cm. long, petiolate. 



Loranthus liebmanni was described from Chinantla, Oaxaca, and may be 

 different. 



5. Struthanthus densiflorus (Benth.) Standi. Contr. U. S. Nat. Herb. 20: 



212. 1919. 



Loranthus densiflorus Benth. Pi. Hartw. 62. 1840. 



Veracruz to Oaxaca ; type from Hacienda del Carmen. Central America 

 On Citrus, etc. 



Leaves lanceolate or ovate, 6 to 10 cm. long; flowers verticillate along the 

 axis of a short spike. 



