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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."

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 with 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.

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.