BOREALES FLAVESCENTES 37 



Phoradendron colipense n. sp. 



Not forked, the rather long branches without cataphyls, dioecious. 

 Internodes moderate (2-3x20-40 mm.), like the foliage from coarsely 

 hispid with short yellow hairs becoming nearly glabrous. Leaves obliquely 

 oblanceolatc-elliptical, very obtuse, 1.5-2.5x5-8 cm., cuneately subpetioled 

 for about 8 mm. Spikes mostly clustered, moderate (35 mm.), yellow- 

 hispid, with 5 or 6 oblong joints about 30-flowered when staminate: 

 peduncle 2 mm. long: scales somewhat tomentose. Pistillate flowers and 

 fruit?. Plate 23. 



Eastern Sierra Madre region. The type from eastern Mexico. 



Specimens examined : MEXICO. Colipa (Liebmann, 8, the type, 

 P. flavescens pubescens Oliver, Vidensk. Meddel. Naturalist. Foren. 

 Kjobenhavn. 1864. p. 176. 



PHORADENDRON MACROPHYLLUM Cockerell. 



Phoradendron macrophyllum Cockerell, Amer. Nat. vol. 34. p. 293. 1900. 



P. flavescens macrophyllum Engelmann in Rothrock, Bot. Wheeler, p. 

 252. 1878. ( =Rothrock, Repts. upon the bot. collections, as vol. 6, 

 Rept. U. S. Geogr. Surv. . . .in charge of G. M. Wheeler). 



Not forked, the rather long and stout branches without cataphyls, 

 dioecious. Internodes rather short (3-5x20-30 mm.), from sparingly vil- 

 lous becoming nearly glabrous, like the foliage. Leaves broadly elliptical- 

 obovate or nearly round, very obtuse, large, 2-4.5x2.5-6 cm., rather 

 abruptly wing-petioled for about 5 mm. Spikes often clustered, mod- 

 erate (15-30 mm., sometimes lengthening to 50 mm. in fruit), glabrate, 

 with some 4 subglobose joints about 6-flowered when pistillate, or 3-6 ob- 

 long joints 18- to 36-flowered when staminate: peduncle 2-5 mm. long: 

 scales somewhat villous. Fruit white, globose, essentially glabrous, 4-5 

 mm. in diameter, in rather close whorls : sepals glabrate, little parted. 

 Plates 5, 7, 9, 10, 34. 



Sonoran region, on Alnus, Celtis, Fraxinus, Juglans, Platanus, Pop- 

 M/I/.S and Salix.* The type from Arizona. 



Specimens examined: UNITED STATES. ARIZONA. Gila River (Gil- 

 bert, 104, 1873; Camp Grant (Rothrock, 362, 1874) : the types of 

 P. flavescens macrophyllum, both on Fraxinus. Bill Williams Fork 

 (Bigelow, 3, 1854). Without locality (I.Fremont, 106, 1844; Palmer, 

 1876). South of Flagstaff (Drake, 15116-7, 15120}. Beaver Creek 

 (Drake, 15121}. Santa Rita Mts. (Engelmann, 1880; Griffiths, 2678; 

 Shear, 4200, 4206}. Santa Catalina Mts. (Tourney, 2}. Chiricahua Mts. 

 (Elumer, 1520, 1523, 1533, 1946}. Tucson (Tourney, 33, 1894; Shear, 



*A list of hosts probably inclusive of the next species is given by Hedgcock 

 in Phytopathology, vol. 5. p. 178. 



