252 BOTANY. 



mon Eastern type. The first may be characterized as var. macrophyttum, 

 with large orbicular-obovate, glabrate leaves, only in the young state with 

 an evanescent pubescence, H-2£' long, 3- and often 5-nerved ; staminate 

 spikes unusually thick, with 4 or 5 short joints, each with 1 0-40, compara- 

 tively large, pubescent flowers. — They grow on soft woods (Ash, Willow, 

 Poplar, Sycamore, and Sapindus) on the Gila and Bonita Rivers, and 

 extend into Southern California, G. K. Gilbert, Dr. Rothrock. 



Var. villosum (Plior. villosum, Nutt), with woolly, obovate, and var. 

 orbiculatum, with rounded, pubescent leaves, are found on hard woods, 

 principally on Oaks, in Oregon, California, Arizona, and southeastward. 

 On the mountains about Camp Apache, Arizona, they grow on different 

 varieties of Quercus undulata. 



Phoradendron Californicum, Nutt. PI. Gambel. p. 185. — Slender, 

 terete, much branched, leafless stems, 1-2° long, bearing, in the axils of 

 the opposite, connate, acute, spreading scales, numerous short, pubescent, 

 1- or few-jointed spikes, each joint with 2-6 flowers ; staminate flowers 

 with oblong anthers, the cells opening longitudinally. — Arizona and South- 

 ern California, G. K. Gilbert, Dr. Rothrock, on Mimosets, Larrea, and a 

 few other shrubs. 



Phoradendron juniperinum, Engelm. PI. Fendl. p. 58. — Half a foot 

 to a span high, densely branched ; small, obtusish leaf-scales ciliate ; stam- 

 inate spikes very short, mostly with a single 6-8-flowered joint, pistillate 

 ones with only two opposite flowers. — Common on different species of Juniper 

 throughout Arizona and in the adjacent districts ; collected by all the differ- 

 ent Expeditions. The short joints are so fragile that the dried specimens 

 easily break up. 



Arceutiiobium* Americanum, Nutt.; Engelm. PI. Lindh. 214. — Slender, 

 dichotomously and verticillately much branched, greenish-yellow; staminate 



* Akceutiiobium, Bieb. — Flowers dioecious, axillary and terminal, single or several from the same 

 axil; staminate flowers moslly X- (rarely 2-, 4-, or 5-) parted ; the axillary buds compressed, the terminal 

 ones globose ; circular anthers aduate to the lobes, 1-celled, after opening saucer-shaped ; pollen-grains 

 spinulose; pistillate flowers compressed, ovate, subsessile ; pedicel at length elougated, and at maturity 

 recurved ; berry compressed, fleshy, dehiscent at the circumscissilo base. Glabrous, jointed, shrubby 

 parasites of Conifers, of greenish or brownish color, with quadrangular branches and scale-like leaves 

 connato into shea'-hiiig cups ; flowers often crowded into apparent spikes or panicles, opening iu spring, 

 summer, or autumn ; berries mature in the second autumn, when they suddenly and forcibly eject the 

 glutinous seeds to the distance of several yards. 



