178 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. RAZOUMOFSKYA Hoffm. 



Small stout branched plants, with little or no greenish tinge, brownish or yellowish, 

 parasitic on the Pinaceae; branches 4-angled, glabrous; leaves scalelike; fruit a com- 

 pressed berry containing a single seed, maturing the second year. 



In general appearance the plants resemble Phoradendron juniperinum, but they 

 are usually much smaller. They are of little value for decorations because of their 

 lack of foliaceous leaves, but the berries of some species are handsome. 



KEY TO THE SPECIES. 



Stems stout, 2 to 5 mm. in diameter; plants large, 6 to 20 cm. high. 



On Pinus brachyptera 1. R. cryptopoda. 



Stems slender, 1 to 2 mm. in diameter; plants usually much 

 smaller, 6 cm. high or less. 

 Plants greenish brown; accessory branches of fruiting speci- 

 mens mostly leaf-bearing. On Pinus edulis 2. R. divaricata. 



Plants greenish yellow; accessory branches of fruiting speci- 

 mens flower-bearing. 

 Fruit nearly truncate at the apex, obovoid, not manifestly 



stipitate. On Pinus jlexilis 3. R. cyanocarpa. 



Fruit rounded or acutish at the apex, ellipsoid, evidently 

 stipitate. 

 Plants very slender, small, 3 cm. high or less. On 



Pseudotsuga 4. R. douglasii. 



Plants stouter, larger, 4 to 6 cm. high. On Picea en- 



gelmanni 5. R. microcarpa. 



1. Razoumofskya cryptopoda (Engelm.) Coville, Contr. U. S. Nat. Herb. 4: 192. 



1893. 

 Arceuthobium robustum Engehn. Mem. Amer. Acad. n. ser. 4: 59. 1849, nomen 



nudum. 

 Arceuthobium cryptopodum Engelm. Bost. Journ. Nat. Hist. 6: 214. 1850. 

 Razoumofskya robusta Kuntze, Rev. Gen. PL 2: 587. 1891. 



Type locality: "Santa Fe, only on Pinus brachyptera." Type, Fendler's no. 283. 

 Range : Colorado to New Mexico and Arizona. 



New Mexico: Common on the yellow pine (Pinus brachyptera), wherever this is 

 found. 



2. Razoumofskya divaricata (Engelm.) Coville, Contr. U. S. Nat. Herb. 4: 192. 



1893. 

 Arceuthobium divaricatum Engelm. in Wheeler, Rep. U. S. Surv. 100th Merid. 6: 



254. 1878. 

 Type locality: "On Nut-pines (P. edulis and monophylla) from southern Colorado 

 through New Mexico to Arizona." 

 Range: Colorado to Arizona and New Mexico. 



New Mexico: Tunitcha Mountains; Cedar Hill; Santa Fe; Mogollon Creek; Tele- 

 graph Mountains; Fort Bayard; Burro Mountains. On Pinus edulis. 



3. Razoumofskya cyanocarpa A. Nels.; Rydb. Colo. Agr. Exp. Sta. Bull. 100: 



101. 1906. 

 Arceuthobium cyanocarpum A. Nels. in Coulter, New Man. Rocky Mount. 146. 1909. 

 Type locality: "Parasitic on Pinus Jlexilis, from Wyo. to Colo." 

 Range: Wyoming to New Mexico. 

 New Mexico: Hillsboro Peak; East Canyon. On Pinus Jlexilis. 



