MISTLETOE FAMILY 



531 



6. Razoumofskya tsugensis Rosend. Hemlock Dwarf IMistletoe. Fig. 1286. 



Raaoumofskya tsugensis Rosend. Minn. Bot. Stud- 

 ies III. 2: 272. 1903. 



Rasoiimofskya douglasii tsugensis Piper, Contr. Nat. 

 Herb. 11: 222. 1906. 



Arceuthobium douglasii tsugensis M. E. Jones, 

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



Staminate plants paniculately branched, or 

 dichotomously branched above, 4-10 cm. 

 high, brownish yellow, the stems about 1.5 

 mm. thick at base; pistillate plants shorter, 

 usually less branched and darker ; calyx- 

 lobes of the staminate flowers 4, suborbicu- 

 lar, abruptly acute at apex ; fruit 4-5 mm. 

 long. 



Parasitic on Tsuga; western British Columbia 

 and Washington. Type locality: on Tsuga 

 heterophylla (Raf.) Sarg. Vancouver Island, Brit- 

 ish Columbia. 



7. Razoumofskya douglasii (Engelm.) Kuntze. 



Fig. 1287. 



Douglas's Dwarf Mistletoe. 



Arceuthobium douglasii Engelm. U. S. Geol. Surv. 



100th Merid. 6: 253. 1878. 

 Razoumofskya douglasii Kuntze, Rev. Gen. PI. 2 : 



587. 1891. 



Staminate plant slender, 1-3 cm. high, 

 greenish yellow; stems about 2 mm. thick 

 at base, dichotomously branched, the 

 branches simple or with accessary branches 

 behind the first ; calyx-lobes of the stamin- 

 ate flowers round-ovate, 2 mm. long; fruit 

 5 mm. long. 



Parasitic on Pseudotsuga ta.vifolia. Washing- 

 ton to Montana south to California, Arizona and 

 New Mexico. It has not been collected on 

 Pseudotsuga macrocar[^a. Type locality: Santa Fe 

 River, New Mexico. 



Razoumofskya cyanocarpa A. Nels. ; Rydb. Fl. 

 Colo. 100, 101. 1906. Stems greenish yellow, 2-3 

 cm. high, much branched; calyx-lobes usually 3, 

 ovate. Parasitic on Pinus flexilis. Wyoming and 

 Colorado. To be expected on this host in Cali- 

 fornia, but not yet reported. 



2. PHORADENDRON Xiitt. Joiirn. Acad. Phila. II. 1: 185. 1848. 



Woody plants with terete usually jointed and brittle stems. Leaves foliaceous, entire, 

 faintly nerved, or reduced to connate scales. Flowers sunk in the jointed rachis, usually several 

 in the axil of each bract. Staminate flowers with a mostly 3-lobed globose calyx, bearing a 

 sessile transversely 2-celled anther at the base of each lobe. Pistillate flowers with a similar 

 calyx-adnate to the inferior ovary. Berry sessile, ovoid, or globose, fleshy. [Greek meaning 

 tree-thief, from the parasitic habit.] 



About 100 species, all American and chiefly tropical. Type species, Phoradendron californicum Nutt. 



Pistillate flowers 2 on each joint. 



Leaves represented by short thin scales. 



Herbage canescent; spikes several-jointed. 

 Herbage glabrous; spikes 1 -jointed. 



Scales obscurely constricted but not grooved at base. 

 Scales conspicuously constricted, grooved at base as if by a string. 

 Leaves oblanceolate-spatulate. 



Leaves usually 12-20 mm. long; on Sabina and Cupressus. 

 Leaves usually 25-35 mm. long: on Abies. 

 Pistillate flowers 6 or more on each joint. 



Joints of staminate spikes 6-15 mm. long, 20-30-flowered. 

 Herbage glabrous or very sparsely short-villous. 

 Herbage canescently short-villous. 

 Joints of staminate spikes 5 mm. long, about 12-flowered; on Quercus. 



1. P. californicum. 



2. 

 3. 



4. 



5. 



6. 

 7. 



P. 

 P. 



P. 

 P. 



P. 

 P. 

 P. 



libocedri. 

 ligatnm. 



densuin. 

 pauciflorum. 



coloradense. 

 longispicum. 



villosuin. 



