492 
PAPEES ON LOEANTHACEiE. 
ones, rather than by seeds, which, though abundant enough, could not produce such a copious and regular crop, and 
invariably of one or the other sex only. Dr. Eugelinann had been elaborating a monograph of this curious genus, which 
he would olfer to the Academy for publication. — Journal of Proceedings^ May 20, 1872. 
From the Report on the United States Geographical Surveys west of the One Hundredth Meridian, Lieut. 
George M. Wheeler in charge, Vol. VI., Botany, by J. T. Rothrock, 1878. 
Phoradendron flavescens, Nutt. — The collection contains a number of specimens, which represent 
two distinct forms, different from the common Eastern type. The first may be characterized as var. macrophyl- [252] 
LUM, with large orbicular-obovate, glabrate leaves, only in the young state with an evanescent pubescence, 
1J-2J inches long, 3- and often 5merved ; staminate spikes unusually thick, with 4 or 5 short joints, each with 10-40, 
comparatively 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. iT. Gilbert, Dr. Rothrock 
Var. viLLOsuM (Phor. villosum, Nutt.), Avith 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 
feet long, bearing, in the axils of the opposite, connate, acute, spreading scales, numerous short, pubescent, 1- or few- 
jointed spikes, each joint Avith 2-6 flowers ; staminate flowers Avith oblong anthers, the cells opening longitudinally. 
— Arizona and Southern California, G. K. Gilbert, Dr. Rothrock, on Mimoseoe, 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; staminate spikes very short, mostly Avith a single 6-S-floAvered joint, instillate ones with 
only tAVO opposite fioAvers. — Common on different species of Juniper throughout Arizona and in the adjacent districts; 
collected by all the different Expeditions. The short joints are so fragile that the dried specimens easily break up. 
' Arceuthobium Americanum, Nutt.; Engelm. PI. Lmd/t. 214. — Slender, dichotomously and verticil- 
lately much branched, greenish-yellow; staminate plants, 2-4 inches high, J-l line thick at base ; fertile plants [253] 
much smaller ; floAvers small, staminate ones 1 line Avide, lobes ovate-orbicular, acutish ; pistillate flowers ^-1 
line, fruit 2 lines long. — Only on Pinus contorta. Rocky Mountains to Oregon and California ; near Breckenridge, 
at 10,000 feet altitude. Wolf, 1873. FTo Avers late in autumn. — In this and the next species, accessory floAvers or 
floAvering branchlets are developed on the fruiting specimens, in this lateral, in the next dorsal to the fruits or fruiting 
branches. In these two we find no other secondary formation on the fertile plants, but in the other species sterile 
branchlets are developed on them Avhich would fioAver in the following year ; thus these latter continue their existence 
for a longer time than the first two. 
Arceuthobium Douglasii, Engelm. ined. — Blender, small, J-1 inch high, greenish-yelloAV, dichotomously 
branched; branches suberect, single or Avith accessory ones behind the first; floAvers in short, usually 5-floAvered 
spikes, staminate ones less than 1 line wide, Avith orbicular-ovate acutish lobes ; fruit 2| lines long. — On Pseudotsuga 
Douglasii from New Mexico (on Santa Fe River, Rothrock, No. 69, 1874) to Utah, Parry, Siler, and Northern Arizona, 
Camp Apache, G. K. Gilbert (109), 1873. — Flowers, May and June. — Similar to the last, but smaller, and never Avith 
verticillate branchlets or flowers, which are so common in that species. The thallus-like tissue or stroma, which 
creeps along within the bark of the nurse-plant, buds out in autumn all along the three-years-old shoot ; after about 
twelve months, the flower-buds are formed, to open in the following spring, after Avhich the life of the male plant is ex- 
hausted ; but it takes another year to perfect the fruit. The female parasite, now fully three years old, generally 
dies, but sometimes lives and fructifies another season. The Northeastern A. pusillum. Peck, behaves in the same 
manner, while in A. Americanum and some other species the buds of the parasite make their appearance at first only 
among the older bud-scales of the pine branch. 
Var. 1 MiCROCARPUM is parasitic on Picea Engelmanni, found by Mr. Gilbert in 1873 (100 and 102) in the Sierra 
Blanca, Arizona ; it is a little taller, 1-2 inches high, but has much smaller fruit, only If lines long, the smallest of 
any American species. 
Arceuthobium divaricatum, Engelm. ined. A. campylopodum, var., Engelm. PI. Lindh. — Much stouter [254] 
than the last, 2-4 inches high, below 1 line in diameter, olive-green or light brownish ; branches spreading, often 
recurA^ed ; staminate flowers few and scattered, or in 3-7-floAvered spikes, 1 line in diameter, with ovate, acute lobes ; 
inflorescence often bearing sterile branches from the same axils as the fruiting ones and behind them ; fruit lJ-1} 
lines long. 
On Nut-pines (P. edulis and monophyllos) from Southern Colorado through New Mexico to Arizona, G. K. Gilbert, 
1873 (116), Dr. J. B. Girard, 1874. Flowers, August and September. Intermediate in size and color between the last 
and the following ; well marked by its divaricate habit and its scanty flowers. 
L 
cm 
2 3 4 5 6 7 8 910 
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