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PROCEEDINGS OF THE AMERICAN ACADEMY 



sparingly toothed, 3 to 8 lines long : raceme many-flowered, elongated : 

 flowers yellow, becoming whitish, small: pods erect on the short 

 divaricate pedicels, elliptic-oblong, obtuse, pubescent, 4 lines long by 

 a line broad: style none. — Rocky Mountains of Colorado; South 

 Park, Wolf & Rothrock (n. 637) ; near Empire, E. L. Greene ; also 

 collected by Hall & Harbour. — D. stenoloba, Ledeb., is much 

 more slender and less pubescent (nearly glabrous above), with nar- 

 rower leaves, looser racemes, and narrower glabrous pods acutish at 

 each end. — D. nemorosa, Linn., to which both have usually been 

 referred and which is also frequent in the Rocky Mountains, is of lax 

 spreading habit, with the ovate-oblong to lanceolate leaves rarely 

 rosulate at base, pale yellow flowers, and the usually slightly pubes- 

 cent pods (2 to 4 lines long) much shorter than the slender pedicels. 



Thelypodium ambiguum. A stout erect glabrous and glaucous 

 branching biennial, 3 to 5 feet high : leaves sessile, broadly auricled, 

 the lower oblanceolate, coarsely serrate, 6 to 8 inches long, the upper 

 ovate to lanceolate, acute, mostly entire : flowers reddish purple, on 

 spreading pedicels (3 or 4 lines long) in an open raceme ; petals with 

 an ovate-oblong blade and rather narrow claw, nearly twice longer 

 than the oblong obtuse purplish sepals (2 J lines long) : pod elongated, 

 narrow (3 inches long by less than a line broad), terete and subtoru- 

 lose, recurved-spreading ; stipe slender, nearly 2 lines long: stigma 

 sessile, capitate. — Northern Arizona, Dr. Newberry on Lieut. Ives's 

 Expedition (Streptanthus sagittatus of Ives's Report), and Dr. E. 

 Palmer in 1877 (n. 27). Also n. 109, Watson, from Regan's Valley, 

 N. Nevada, is apparently the same. 



Viola cuneata. Glabrous: stem a span long, leafy, ascending 

 from a short rootstock : leaves rhombic-ovate, acute, attenuate at base 

 into a slender petiole, crenately toothed above : petals deep purple, 

 more or less bordered or blotched with white, beardless, 4 lines long ; 

 spur very short, yellowish : capsule glabrous. — Humboldt County, 

 California, on a high open ridge south of Trinity River ; V. Rattan, 

 June, 1878. Allied to V. ocellata and V. Hattii. 



Silene Sargentii. Low and alpine (6 inches high), puberulent, 

 cespitose and many-stemmed, with the habit of dwarf forms of S. 

 Douglasii, to which it is allied : leaves linear, slightly oblanceolate, 

 1 to 2 inches long : flowers 3 to 6 : calyx 6 or 7 lines long, cylindrical, 

 with short teeth: petals about 10 lines long, the obovate bifid blade 

 with a small tooth on each side ; auricles broad, laciniately toothed ; 

 appendages large and broad, toothed : styles long-exserted : capsule 

 narrowly cylindrical, long-stipitate : seeds minutely tuberculate on the 



