1913] NELSON—ROCKY MOUNTAIN PLANTS 65 
Atriplex Greenei, n. sp.—Pale greenish moderately scurfy 
annual, with tapering taproot 1 dm. or more long, branching from 
the crown: the axes of the main branches excurrent, 1.5~—3 dm. 
long, somewhat tortuous or zigzag, with short slender spreading 
or ascending branchlets from the numerous approximate nodes: 
leaves very narrowly linear, the lower only 10-15 mm. long, passing 
into the subulate bracts above: fructiferous throughout, the fertile 
flowers 1~several at each node: fruiting bracts very small, about 
2mm. long, closely united, narrowly ovate, the obtuse apex often 
tipped with a small tooth, the backs usually appendaged at the 
middle or above with few-several small conical or cylindrical 
papillae. 
This species is most nearly allied to A. tenuissima A, Nels., Bor. Gaz. 
34*257. 1902, but in that the leaves are only 1~7 mm. long, oblong to ovate 
or broader, and the fruit subpyramidal and tuberculate below the middle. 
I dedicate this species to its collector, the indefatigable phytographer, 
Philosopher, and historian, my friend, Dr. E. L. GREENE, who secured it at 
Rock Springs, Wyoming, August 9, 1896. 
Arceuthobium Blumeri, n. sp.—Stems branching dichotomously 
beginning at the first node and then either regularly or often skip- 
ping a node, 4-8 cm. long: fertile branches pale-green, with 
sharply almost wing-angled internodes; the connate scales form- 
ing a shallow cup with two very short broadly triangular points 
(or these sometimes nearly or quite wanting), the cup about 2 mm. 
broad: fruit narrowly elliptic or almost fusiform, 3 mm. long and 
half as broad, on a stipe about 2 mm. long, the body blue-green, 
the wrinkled conical apex and the stipe pale——On Pinus strobi- 
Jormis Engelm. 
Specimens on which this species is based were secured in the Huachuca 
Mountains of Arizona, in October 1910, and were communicated by J. C. 
BLUMER. Apparently this is the first record of this genus on the above species 
of five-leaved pines. A. cyanocarpum has been reported only on Pinus flexilis 
ames. A. divaricatum Engelm. seems to use the one and two-leaved pines 
as host. 
Astragalus macer, n. sp.—Pale and obscurely appressed puberu- 
lent: caudex branched, mostly subterranean: stems slender, spar- 
ingly branched, 3-5 dm. high, including the raceme: leaves with 
linear rachis 3-6 cm. long, on which are borne 3-7 linear alternate 
