Nelson : New Plants from Wyoming 35 



intermingled with the grasses (Agropyron sp.). In a region in 

 which the Artcmisias constitute an appreciable part of the forage, 



seem 



mit 



the ground or cut and cured with the grasses. 



v Artemisia paucicephala 



Tufted and matted, the long, woody rhizomes intricately inter- 

 laced and bearing numerous, fibrous roots : thinly but permanently 

 silvery-tomentose throughout : stems numerous, leafy to the sum- 

 erect, simple or sparingly branched, 2-4 dm. high : leaves 

 4-8 cm. long, mostly entire, linear to lanceolate, some with a 

 broad, 3-5-cleft apex, nearly all with a narrowed, petiole-like base, 

 only a few of the uppermost reduced and bract-like : heads few, 

 racemosely disposed on the main stem and its slender branches (if 

 any), rather large, sessile or short pedicelled, broadly campanulate, 

 about 5 mm. in diameter (40-60 flowered) ; involucral bracts oval 

 or ovate, scarious margined : the pistillate flowers fe\v 9 very slen- 

 der, with linear-clavate styles ; the hermaphrodite with spreading 

 recurved styles and penicillate stigmas protruded between the lobes 

 of the corolla : corolla sparsely resinous dotted, mainly on the 

 tube. 



This has affinities with both A. Ludoviciana Nutt. and A. Na- 

 tronensis Aven Nelson but may at once be distinguished by its 

 tufted caespitose habit, its low, erect stems, its different leaves and 

 few, many-flowered heads. 



Collected near Yellowstone Lake, on the banks of a tributary 

 creek, where occasional mats of it were to be found ; no. 6344, 

 Aug. 6, 1899. 



/ Artemisia gracilenta 



Tufted perennial, from a deep-set caudex whose numerous 

 branches are spreading- rhizomatous and give rise to numerous, fi- 

 brous roots : white tomentose throughout : stems herbaceous, 

 slender, strict, erect, 4-8 dm. high : leaves numerous, sessile by a 

 narrow base, 3-5 cm. long, pinnately parted ; the 5 or more di- 

 visions linear, widely divergent and often more or less cleft towards 

 the apex, 1-2 cm. long; the lower bracts similar but smaller, 

 gradually passing into the small, linear, entire ones of the summit : 

 inflorescence spicate-axillary, the rather large heads produced 

 singly, or sometimes more crowded, the inflorescence then tending 

 to become thyrsoid-paniculatc with smaller heads : heads broadly 

 campanulate, 5-7 mm. high and nearly as broad, sessjle or on 

 rather stout pedicels I -several mm. long, these erect or only 



