Studies on the Rocky Mountain Flora, — 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 i 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. liyssopifolium 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. nitidiiin 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). 



Colorado : Huerfano Valley, near Gardner, 1900, F. K. Vree- 

 laiid, 6^j ; Rocky Ford, 1893, Craiidall ; Denver, 1887, 5. M. 

 Tracy. 



Chenopodium Watsoni a. Nelson, Bot. Gaz. 34 : 362. 1902 

 Oicnopodiuin 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 i. 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. olidiim 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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