38 THE GENUS PHORADENDRON 



4259; Ferriss; Lloyd, 1907). Huachuca Mts. (Wilcox, 1892; Ferriss). 

 Fort Verde (Mearns, 164). Tonto Basin (Tourney, 289). Sta. Cruz 

 River (Prince, 1884). Willow Springs Mts. (Griffiths, 3644). Dudley- 

 ville (Griffiths, 3676). Rincon Mts. (Griffiths, 1797). Beaver Creek 

 (MacDougal, 612). Dragoon Summit (Eby). Oracle (Hedgcock & 

 Long, 9692). Sedona (Hedgcock, 4924). 



An almost glabrous form, f . glabrata, occurs with the type in south- 

 ern Arizona: Dudley ville (Griffiths, 3674) ; Arabaca (Griffiths, 6144) ; 

 Chiricahua Mts. (Blunter, 1517, 1534, 1535; Burrall, 1126) ; on the Boun- 

 dary, south of Bisbee (Mearns, 891) ; and from S. Pedro to Fronteras, 

 Sonora, Mexico (Harrtman, 946). 



Phoradendron macrophyllum circulars n. var. 



Leaves round, small, 1.5-2 cm. in diameter ; otherwise resembling the 

 type, with which it occurs. Plate 35. 



Specimens examined: UNITED STATES. ARIZONA. Sta. Rita Mts. 

 (Griffiths & Thornber, 191, the type). 



Phoradendron macrophyllum Jonesii n. var. 



Leaves oblanceolate-obovate, small, scarcely 1.5-2x3-4 cm., resembling 

 those of P. Engelmanni; the young growth yellowish- or gray-tomentose. 

 In the region of the type. Plate 35. 



Specimens examined: UNITED STATES. ARIZONA. Bowie (Jones, 

 4279, the type; 4281, in leaf -shape approaching var. circulare). 



Phoradendron Cockerellii n. sp. 



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

 dioecious. Internodes rather short (2-4x20-40 mm.), quickly glabrate 

 like the foliage. Leaves broadly elliptical to oblanceolate, very obtuse, 

 1.5-2x3.5-5.5 cm., cuneately subpetioled for 5-10 mm. Spikes mostly sol- 

 itary, moderate (15-30, or lengthening to 40 or 50 mm.), glabrous, with 

 about 4 joints clavately about 6-flowered toward the top when pistillate 

 and ellipsoidal and 20- to 30-flowered when staminate : peduncle 4-5 mm. 

 long : scales and receptacular cups ciliate. Fruit white, globose, glabrous, 

 about 4 mm. in diameter, in distinct whorls : sepals glabrous, closely in- 

 flexed. Plates 5, 36. 



Southern Rocky Mountain region, characteristically on Populus and 

 Salix, but also on Fraxinus. The type from New Mexico. It was this 

 New Mexican form which Professor Cockerell actually had before him 

 when applying to the preceding species the binominal P. macrophyllum 

 as a substitute for P. flavescens macrophyllum Engelmann. 



