1919] Hall: Chrysothamnus natiseosus and Its Varieties 177 



This is the common Chrysothamnus on alkaline flats of the Great 

 Basin, especiallj^ in northern Nevada, whence it extends to Arizona, 

 California, Oregon, and Idaho. In western Utah also it is the common 

 alkali-flat form but easterly it merges both in characters and distri- 

 bution into pinifolius. It may usually be distinguished from this 

 form by the longer, more spreading corolla-lobes, and sometimes by 

 the more elongated inflorescence. To the southwest of its range it 

 passes into viriduliis, as indicated under that variety. C. angnstus 

 Greene, Pitt., vol. 5, p. 64, 1902, described from specimens collected 

 in northeastern California, is exactly the same. It was said to be 

 distinguishable by its canescent "woolliness," but copious material 

 from both tj^pe localities indicates that this character can be correlated 

 neither with other characters nor with geographic distribution, and 

 the amount of pubescence is of course variable. These remarks apply 

 equally well to leaf-length, and no other differentiating characters 

 appear in the descriptions. 



20. Chrysothamnus nauseosus var. viridulus var. nov. 



Shrub robust, green, about 1.5 m. high, leafy to the summit : 

 twigs densely covered with pannose yellowish green tomentum, rather 

 stout, striate : herbage malodorous : leaves at first erect or ascending, 

 later inclined to droop, narrowly linear, 3 to 5 cm. long, about 1 mm. 

 wide, acute, 1-nerved, channeled above, green but tomentulose on 

 both sides : inflorescence a pyramidal to nearly globose, thyrse : in- 

 volucre 6 to 7 mm. high, glabrous but viscid with a resinous exudation ; 

 bracts 3 or 4 in each of the 5 vertical ranks, carinate, the outer ones 

 acute, the innermost ones obtuse : flowers, 5 : corolla 8.3 to 10 mm. 

 long; tube glabrous or sparsely puberulent, passing gradually into 

 the throat; lobes linear, acute, 2 to 2.5 mm. long, 0.4 mm. wide, 

 recurving in age : anthers 3 to 3.3 mm. long, the tip 0.42 to 0.68 mm. 

 long : akenes densely sericeous : pappus about 7.5 mm. long. 



Frutex validus, viridis, ca. 15 dm. altis, undique foliosus : ramulis 

 tomento luteolo-viridi dense vestitis, paullo robustis striatis, odore 

 injucundis : foliis primum erectis vel ascendentibus, delude flaccescere 

 inclinantibus, anguste linearibus, 3-5 cm. longis, ca. 1 mm. latis, 

 aeutis, 1-nerviis, supra impressis, viridulis, utrinque tomentulosis : 

 inflorescentia thyrsum globoso-pyramidatum formante : involucro 6-7 

 mm. alto, glabro, resinoso-viscido : squamarum seriebus verticalibus 5, 

 in utraque serieri 3^, carinatis, exterioribus aeutis, interioribus 

 obtusis : floribus 5 : corolla 8.3-10 mm. longa, tubo glabro parce 

 puberulo, infundibuliformi, lobis linearibus, aeutis, 2-2.5 mm. longis, 

 0.4 mm. latis, deinde recurvatis : antheris 3-3.3 mm. longis muorone 

 0.42-0.68 mm. longo : achaeniis dense sericeis : pappo ca. 7.5 mm. 

 longo. 



■&^ 



Benton, Mono County, California, on sandy alkaline flats with 

 Distichlis, in the Upper Sonoran Zone, at 5640 feet altitude, Novem- 



