530 



LORANTHACEAE 



4. Razoumofskya abietina 



(Eiigelm.) Abrams. Fir Dwarf 



Mistletoe. Fig. 1284. 



Arceuthobiuni abietinuin Engelm.; Proc. Am. 



Acad. 8: 401. 1872, nomen midum. 

 Arceuthobiuni douglasii abietinuin Engelm. in 



S. Wats. Bot. Calif. 2: 106. 1880. 



Arceuthobium occidentale abietimim Engelm. in 

 S; Wats. Bot. Calif. 2: 107. 1880. 



Razoumofskya douglasii abietina Greene, FI. 

 Fran. 341. 1892. 



Racojimofskya occidentalis abietina Howell FI. 

 N. W. Am. 1 : 609. 1902. 



Staminate plant rather stout, spread- 

 ing, greenish brown or tinged witli yel- 

 low, 5-10 cm. high; the stems 2-3 mm. 

 thick at base ; pistillate plants usually a 

 little higher and darker ; staminate spikes 

 not crowded on the branches, 6-8 mm. 

 long, 2-2.5 mm. thick, 6-7-jointed; calyx- 

 lobes 7; staminate flowers usually 4, 

 ovate, 2 mm. long ; fruit 3-4 mm. long. 



Parasitic on species of Abies; Washington 

 to California and Utah. Type locality: Sierra 

 Valley, California, on Abies concolor. There 

 are no essential differences between the plants 

 on Abies concolor, which were described by 

 Engelmann as a variety of R. douglasii and 

 those on Abies grandis, which he lirst consid- 

 ered a species but later published as a variety 

 of R. occidentalis. 



3. Razoumofskya divarcata 



(Engelm.) Coville. Piiion Dwarf 

 Mistletoe. Fig. 1283. 



Arceuthobiuni divaricatum Engelm. U. S. Geol. 

 Surv. 100th Merid. 6: 253. 1878. 



Rasoumofskva divaricata Coville, Co-ntr. Nat. Herb. 

 4: 192. 1893. 



Staminate plants rather stout, much 

 branched, olive green, or brown, 5-10 cm. 

 high, the stem, 2-3 mm. thick at base, the 

 branches spreading, often flexuous or re- 

 curved ; the pistillate plants similar. Stam- 

 inate spike very slender, scarcely 2 mm. 

 thick, mostly 6-8 mm. long, with 5-6 joints; 

 calyx-lobes of staminate flowers 3, ovate 

 acute ; fruit 3-4 mm. long. 



Parasitic on Piiion pines; eastern slopes of the 

 Sierra Nevada, California to Colorado, northern 

 Mexico, and Lower California. Found in Cali- 

 fornia on Pinus monophylla and to be expected 

 on Finns quadrifoHa. Type locality: on Finns 

 edulis and F. monophylla, "from southern Colo- 

 rado through New Mexico to Arizona." 



5. Razoumofskya laricis Piper. 



Larch Dwarf Mistletoe. 



Fig. 



1285. 



Razoumofskya douglasii laricis Piper, Contr. Nat. 

 Herb. 11 : 223. 1906, nomen nudum. 



Razoumofskya laricis Piper, Piper & Beattie, FI. 



Southeast. Washington. 80. 1914. 



Arceuthobiuni douglasii laricis M. E. Jones, Bull. 

 Univ. Montana Biol. ser. 15: 25. 1910. 



Staminate plants divaricately branched, 

 greenish yellow, 3-5 cm. high, the stems 

 about 2 mm. thick at base ; scales very acute ; 

 calyx-lobes of the staminate flowers 3, ovate, 

 acutish, 2 mm. long; fruit about 4 mm. long. 



Parasitic on Lari.v occidentalis. Washington to 

 Montana, south to Oregon. Type locality: Mt. 

 Adams, Washington. 



