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 
oblanceolate-elliptical, very obtuse, 1.5-2.5x5-8 em., euneately 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. 
Kjöbenhavn. 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. . . іп 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 em., 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: 
seales somewhat villous. Fruit white, globose, essentially glabrous, 4-5 
mm. іп diameter, in rather close whorls: sepals glabrate, little parted.— 
Plates 5, 7, 9, 10, 34. 
Sonoran region, on Alnus, Celtis, Fraxinus, Juglans, Platanus, Pop- 
ulus 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 
Р. flavescens macrophyllum., — both on Fraxinus. Bill Williams Fork 
(Bigelow, 3, 1854). Without locality (? Fremont, 106, 1844; Palmer, 
1876). South of Flagstaff (Drake, 15116-7, 15120). Reaver Creek 
(Drake, 15121). Santa Rita Mts. (Engelmann, 1880; Griffiths, 2678 ; 
Shear, 4200, 4206). Santa Catalina Mts. (Toumey, 2). Chiricahua Mts. 
(Blumer, 1520, 1523, 1533, 1940). Тпевоп (Toumey, 33, 1894; Shear, 
*A list of hosts—probably inclusive of the next species—is given by Hedgeock 
in Phytopathology: ен 5. р. 178. 
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