Arceuthobium. LORANTHACEyE. ^^Q*^ 



branch, and not between the bud-scales only as in the last. Another variety, with very small 

 fruit, is found on Picea Eiujelmanni in Northern Arizona. 



-t- -1- Stouter, gveeyiish-hroivn : accessory hranchlets of fruiting specimetis mostly 



leaf-bearing. 



3. A. divaricatum, Engolm. Stouter than the last, 2 to 4 inclies high and a 

 line in diaiut'ter at base, olive green or pale brownish ; branches spreading, often Ilex- 

 nous or recurved : staininato ilowers few and scattered or in 3 - 7-flowered spikes, a 

 line wide, with ovato acute lobes: fruit U to 1^ lines long. — PI. Wheeler, 1874, 

 IG, and Wheeler's llei). vi. 253. A. campylopodam, var., Engelm. I'l. Lindh. 114. 



On Pimis cdalis and P. monnphylla, from New Mexico and S. Colorado to Arizona and S. 

 Utali, and to be looked for on the latter species in S. California. Flowcrinj^ in August and Sep- 

 tember. Intermediate in size and color between A. Duitcjlasii ami the following species, but well 

 characterized by its slender habit, spreading growth, and small and rather scanty male flowei's. 



4. A. OCCidentale, Engelm. Stout, 2 to 5 inches high, 2 to 2^ lines thick at 

 base, i)anieu lately much-branched : staminato plants brownish yellow, smaller, the 

 pistillate commonly of a darker olive-brown color: staminate flowers in long dense 

 spikes, often 9 to 17 on a single axis, their bud.s ventricoso with the upper edge 

 curved outward ; calyx 3-5- (usually 4-) i)arted, 1^ to 2 lines wide ; anthers sessile 

 below tiie middle of the lanceolate acuminate lobes : fruit 2^ lines long. 



Var. abietinum, Engelm. More spreading and less densely branched, the acces- 

 sory branches in the fruiting plant bearing fertile flowers as often as they do leaf- 

 buds. — A. abiednum, Engelm. Proc. Amer. Acad. viii. 401. 



On various conifers of the Coast Ranges and Sieri-a Nevada (Pinics insignis, P. Sahiniana, and 

 P. poncferosa), from Salinas Valley and Walker's Basin to Oregon. It is the only American species 

 found also on Juniperus (Silver ^lountain. Braver). Tlie variety occurs on Abies ijrandis in 

 the valley of the Columbia, Hall. Flowering in August and September. 



Tiie closely allied A. VAOIXATUM, Eichler (J^isciuii vncjinntum, HBK.), upon the pines of the 

 Mexican mountains, of which oidy incomplete material has been collected, has shorter spikes and 

 smaller mostly 3-parted staminate Mowers with broader and .shorter lobes. A. uobu.stum, Engelm., 

 on Piiuis pnndcrosa in the Kocky Mountains and Arizona, has shorter spikes than A. occidmtale, 

 with shoitcr flat appressed .staminate buds, the 3-parted Jiowers (opening in June) with shorter 

 and broader lobes, bearing the anthers above their middle. Of the only remaining known species 

 of this curious gemis Seemann gathered on the Sierra Madre of Jlexico a staminate specimen, in 

 bud only, which is distinguishe<l from all others by its "reater thickness and by the long spikes 

 of large verticillato 4-parted flowers, mostly 6 in a wliorL It may therefore bear the name 



A. VEUTICILLIFLOUUM. 



