372 



LORANTHACEAE 



4. P. californicum Nutt. Stems slender, terete, hanging or pendulous from 

 the host- herbage pubescent or finally glabrous; scales broadly ovate, acute, 

 spreading; staminate spikes consisting of 2 or 3 (or 5) iiower-bearing joints 

 each with 2 to 6 tiowers ; anthers oblong, the cells openuig by a longitudinal 

 slit • pistillate spikes sometimes with nearly as many joints and flowers as the 

 staminate; joints in fruit elongated (2 to 12 lines long) ; berries red, 2 lines 



in diameter. , /-, , j -nv 4. 



Southern California along the Colorado River and in the Colorado Desert. 



Arizona. Parasitic on Prosopis juliflora and pubeseens, Larrea mexieana, 



Acaciti ffrcfir^ii etc 



Loes.— Impmal, Soadhouse ; Indio, Vavy 45; Mecca, Man/ McKibieii; Cottonwood Sprs., 



Eall 6U14; Mellen, Colorado River, Jepsoii 519.5. ,1o<o^ .. 



Ref.— Phokadendron californicum Nutt. Jour. Acad. Phila. ser. 2, 1: ISo (1848), type 

 loc. Southern California, Gambel, parasitic on Prosopis pubeseens. 



5. P. juniperinum Engelm. Stems stout, terete, in erect tufts. 6 to 12 

 • inches high, the ultimate branchlets 4-sided; scales low-triangular, ciliate, 



distinct or connate; staminate spikes consisting of 1 (rarely 2) very short 

 joints; joints 6 to 8-llowered; anthers tranverse, opening by pores; pistillate 

 spikes' 2-flowered ; berry whitish or light red, 11/2 lines in diameter. 



Sierra Nevada, on Juniperus. East to New Mexico. 



Var. libocedri Engelm. Branches longer and more slender; joints more 

 elongated.— Sierra Nevada south to the San Bernardino and San Jacinto 



mountains, on Liboeedrus decurrens. ,1„,a^ . 



Refs Phoradendron juniperinum Engelm. Mem. Am. Acad. ser. 2, 4: 58 (1849), type 



loe. Santa Fe. Var. libocedri Engelm. Bot. Cal. 2: 105 (1880), type Galifornian. 



2. ARCEUTHOBIUM Marsch-Bieb. Pine Mistletoe. 

 Plants yellow or brown, leafless, fragile-jointed, parasitic on coniferous 

 trees. Stems quadrangidar or angled. Leaves reduced to connate scales. 

 Flowers solitary or several in each axil, crowded into apparent spikes, open- 

 ing in autumn. " Staminate flower :— calyx mostly 3-parted, compressed; stamens 

 3, the anthers sessile near the center of the calyx-lobes, roundish, 1-celled, 

 opening by a circular slit. Pistillate flower:— calyx 2-cleft, the teeth laterally 

 disposed, the ovary ripening the next autumn after flowering and exserted 

 on the recurved pedicel. Berry circumscissile near the base, when fully ripe 

 explosively dehiscent at a touch or when teased, the glutinous seed being ex- 

 pelled to a distance of several feet.— Northern hemisphere, 10 species. (Greek 

 arkeuthos, juniper, and bios, life.) 



Staminate flowers on peduncle-like joints in a paniculate cluster 1. A. americanum. 



Staminate flowers in the axils of the scales of a simple or compound spike. 



Host-plant Pscudotsuga 2. ^. douglasii. 



Host-plant Pinus species. 



Staminate plants yellow, pistillate ones brown 3. A. campylopodum. 



Staminate and pistillate plants of the same color or nearly. 



Branches erect ; staminate flowers many 4. A. cri/ptopodum. 



Branches divaricate; staminate flowers often few 5. A. divaricatum. 



1. A. americanum Nutt. Plants greenish yellow, dichotomously or verti- 

 cillately much branched; staminate flowers nearly all terminal on distinct 

 peduncle-like joints. 



Sierra Nevada from the Yosemite region northward to British Columbia 

 and east to the Rocky ilts. On Pinus murrayana. 



Locs.— N. Fork Kings Eiver, Hall cj- Chundler 42(5; Little Yosemite Valley, Bolander 5095. 



Refs. — ARCEUTHOBIUM AMERICANUM Nutt.; Engelm. in Gray, Jour. Bust. Soc. Nat. Hist. 

 6: 214 (1850), type from Oregon, Nnttall. Bazmunofskya americana Kuntze, Rev. Gen. PI. 

 2: 587 (1891). 



2. A. douglasii Engelm. Small, the stems suberect, Vi to 1 inch high; 

 flowers in short usually 5-flowered spikes; berry 2yn lines long. 



