

130 Nelson: New Plants from Wyoming 



Sphaerostigma minor 



A small annual, usually simple stemmed, sometimes 2 or more 

 erect stems from the base, 3- to cm. hii^h, minutely puberulcnt or 

 at length glabrous : leaves rather crowded below, from- linear to 



fc>""' t» 



oblong or broader, entire, subacute, 12-25 mm. long, mostly short 

 petioled, the radical distinctly so : flowers yellowish, minute, axil- 

 lary, mostly crowded near the end of the stems : calyx -tube very 

 short, nearly cylindrical, sliglitly larger upward, about as long as 

 the narrowly ovate, obtusish segments : petals ov^al with acutish 

 ends, scarcely exceeding the sepals and equalled by the pistil and 

 the longer stamens, about 1.5 mm. long: capsule contorted or 

 nearly straight, spreading or erect, linear, slightly attenuated up- 

 ward, subcylindric, striate at maturity, obscurely puberulent : seeds 

 in one row, oblong, subacute at the ends, smooth, about i mm. 

 long. 



Probably most nearly related to S/^haii-ostigma strigulosa (T. 

 & G.) in fruit and floral characters. 



An inconspicuous and scattering plant on the loose, shale cliffs 

 bordering the Green and Platte Rivers. Type specimen in Herb. 

 University of Wyoming no. 3047, Green River, May 31, 1897. 



Peucedanum megarrhiza 



Acaulescent, glabrous throughout : root enormous, semi- 

 woody, deep-set, I m. (more or less) in length, i dm. (more or 

 less) in diameter; caudcx multicipital, very broadly caespitose, 

 branches of caudcx very numerous and crowded, thickly clothed 



with old Icaf-sheaths : leaves few to several from each crown, 

 rather rigidly erect, long petioled, pinnate ; leaflets few, 2—5 rather 

 distant pairs, from simple and narrowly linear to pinnatifid, 2—4 

 cm. long, when pinnatifid the segments few, linear or narrowly 

 oblong, cuspidate as are the leaflets : scapes moderately stout, 1 5— 

 25 cm. high, scarcely exceeding the leaves: umbel 8-12-rayed, 

 rays widely spreading, some of them at length reflexed, nearly 

 equal (shorter in the occasionally aborted umbellcts), about 15 

 mm. long; pedicels 1-2 mm. long; involucels of a few short- 

 lanceolate bracts : calyx teeth \'ciy short : petals yellow : fruit 

 elliptic-oblong, f^—Z mm. long, half as broad : seeds strongly flat- 

 tened dorsally, plane on the commissural surface ; lateral ribs 

 winged, hardly half as wide as the body of the seed, the dorsal and 

 intermediate filiform or almost none : oil tubes about 3 in the in- 

 tervals, 6-10 on the commissural face. 



Certainly closely alHed to 1\ Parryi C. & R. but at once to be 



distinguished by its strongly tufted habit, the stoutish," erect scapes 



