EXPLANATION OF PLATES 167 
Plate 31. a. PHORADENDRON ENGELMANNI. Staminate and fruit- 
ing specimens (Texas, Jermy). b. P. ENGELMANNI CLAVIGER, the 
type (Texas, Trelease, 1897). 
Plate 32. PHORADENDRON GREGGI. Types. а, staminate (Mexico, 
Gregg, 254) ; b, pistillate (Mexico, Gregg, 31). 
Plate 33. a. PHORADENDRON THYRSOIDEUM. The type (Mexico, 
Palmer, 103). b. P. COLIPENSE. The type, staminate, (Mexico, Lieb- 
mann, 8); photographed by permission in the herbarium at Copen- 
hagen. 
Plate 34. PHORADENDRON MACROPHYLLUM ; а, staminate; b, pistil- 
late (Arizona, Blumer, 1533). 
Plate 35. a. PHORADENDRON MACROPHYLLUM CIRCULARE. Type, 
pistillate (Arizona, Griffiths & Thornber, 191). b. P. MACROPHYLLUM 
Јохеѕп. Туре, pistillate (Arizona, Jones, 4279); photographed by 
permission in the Delessert herbarium at Geneva). 
Plate 36. PHORADENDRON COCKERELLI. a. Туре, staminate (New 
Mexico, Metcalfe, 31). `b. Pistillate specimen (New Mexican region, 
Wright, 15). 
Plate 37. PHORADENDRON COLORADENSE. a, staminate; b, pistil- 
late (California, du Barry, 1855) ; photographed by permission at the 
New York Botanieal Garden. 
Plate 38. PHORADENDRON LONGISPICUM, staminate. a. The type 
(California, Wilkes Expedition, 1316,—as P. flavescens quinque- 
nervium Torrey in herb.) b. Another shoot (California, Hasse, 1893). 
Both photographed by permission at the New York Botanieal Garden. 
Plate 39. PHORADENDRON LONGISPICUM, pistillate. a, Shortly 
after flowering, showing the temporary clavate thickening of the spike- 
joints ( California, Abrams, 2749) ; photographed by permission at the 
New York Botanieal Garden. b, At maturity (Fresh material, Cali- 
fornia, Griffiths, 1912). 
Plate 40. PHORADENDRON VILLOSUM. а. Type, staminate (Oregon, 
Nuttall, 1834). b. Pistillate specimen (Oregon, Howell, 1264). 
Plate 41. a. PHORADENDRON VILLOSUM ROTUNDIFOLIUM. The type, 
pistillate (California, Elmer, 3794). b. P. TOMENTOSUM. Fruiting spe- 
cimen (Mexico, Palmer, 777). 
Plate 42. PHORADENDRON TOMENTOSUM. The type (Mexico, Ber- 
landier, 1364). a, staminate. b, pistillate, photographed for M. C. de 
Candolle, in the Candollean herbarium at Geneva. 
