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Studies on the Rocky Mountain Floraa— X 
By PER AXEL RYDBERG 
_ Corispermum marginale sp. nov. 
Annual: stem glabrous, much branched, 2~5 dm. high: leaves 
‘ narrowly linear, 2—5 cm. long, 1.5—2 mm. wide: spike 3-8 cm. 
long, rather dense; bracts usually overlapping each other, the 
lower lanceolate, about 1 cm. long, the upper ovate, 5 mm. long ; 
all more or less acuminate, with a strong midrib and conspicuous 
scarious margins, slightly pubescent when young or glabrate: 
fruit about 4 mm. long and 2.5 mm. wide, with a broad wing 
margin. 
This is perhaps most nearly related to C. hyssopifolium of the 
salt marshes of the coast regions, but is taller, more slender, with 
less fleshy leaves, smaller fruit and more conspicuously scari- 
ous-margined bracts. From C. nitidum it differs in the broader 
bracts, denser spikes and larger fruit. It grows in similar localities, 
viz., in sandy soil, in draws and ravines. 
New Mexico: Albuquerque, 1884, C. L. Herrick (type in 
herb, N. Y. Bot. Garden). 
CoLorapo: Huerfano Valley, near Gardner, 1900, F. K. Vree- 
land, 657, Rocky Ford, 1893, Crandall; Denver, 1887, S. M. 
Tracy. 
CuHENopopiumM Watsoni A. Nelson, Bot. Gaz. 34: 362. 1902 
Chenopodium olidum S, Wats. Proc. Am. Acad. 9: 95. 1874, 
mainly. Not Curt. 
Annual, rather stout, sparingly farinose, 2-6 dm. high: stem 
branched, striate and sometimes tinged with red: leaves rather 
thick ; petioles 2-10 mm. long; blades 1-2 cm. long, oval, ovate 
or oblong, obtuse and occasionally cuspidate-mucronate, dark 
green and sparingly mealy: inflorescence narrow, dense: flowers 
I mm. in diameter: seed 1.25—-1.5 mm. in diameter: pericarp 
mealy and closely adherent. ‘ 
Watson’s name being preoccupied, I apply Nelson’ s substitute 
to this species as it is Watson’s C. o/idum as to the description 
and most specimens cited. Several specimens given by him be- 
long, however, to the next species, which has been confused with 
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