1919 J Hall: Chrysothamniis nauseosus and Its Varieties 167 



3. Chrysothamnus nauseosus var. latisquameus (Gray) comb. nov. 



Bigelovia graveolens latisquamea Gray, Proc. Am. Acad., vol. 8, p. 64-3, 

 1873. 



Shrub tall (perhaps rounded at top), leafy to summit: herbage 

 white with a rather loose tomentum : leaves 2 to 5 cm. long, less than 

 1 mm. wide : inflorescence a loosely branched rounded compound 

 cyme: involucre about 8 mm. high (7 to 9 mm.); bracts carinate, 

 about 4 in each of the 5 distinct vertical rows, outermost ones tomen- 

 tulose, inner ones very obtuse and usually glabrous : corolla about 

 9 mm. long ; tube short-pubescent or glabrous ; lobes ovate or short- 

 lanceolate, 0.4 to 0.9 mm. long, erect. 



A common variety of New Mexico and Arizona. Bigelovia graveo- 

 lens appendiculata Eastw., Proc. Calif. Acad. Sci., ser. 3, vol. 1, p. 74, 

 1897, from the White Sands of New Mexico, is an abnormal form 

 with one to four linear appendages on the corolla-tube. The tube is 

 arachnoid-pubescent and the lobes are only about 0.4 mm. long, both 

 of which characters suggest an affinity with hololeucus. C. arizonicus 

 Greene, Pitt., vol. 4, p. 42, 1899, is a form with the corolla-tube ' ' cleft 

 rather deeply. ' ' The type is from the Santa Rita Mountains. 



4. Chrysothamnus nauseosus var. salicifolius (Rydb.) comb. nov. 



Chrysothamnus salicifolius Rydb., Bull. Torrey Club, vol. 37, p. 130, 1910. 



Shrub 3 to 10 dm. high, with erect branches: leaves 3-nerved, 4 

 to 8 cm. long, 3 to 6 mm. wide, minutely tomentulose : inflorescence 

 cymose, dense : involucre 7 to 8 mm. high ; outer bracts slightly tomen- 

 tulose, the inner glabrous and very obtuse : corolla about 10 mm. 

 long ; lobes 1.5 to 2 mm. long. 



Apparently a rare variety and confined to Utah ; known to the 

 writer from only two collections, namely, Strawberry Valley, at 7000 

 feet altitude, F. E. Leonard, no. 288 (type), and near Salt Lake City, 

 A. 0. Garrett, no. 2455. 



5. Chrysothamnus nauseosus var. gnaphalodes (Greene) comb. nov. 



Chrysotliamnus speciosus var. gnaphaJodes Greene, Eryth., vol. 3, p. 110, 

 1895. 



Shrubs 5 to 15 or rarely 25 dm. high, usually globoid in outline, 

 with very many short twiggy branches, not densely leafy: herbage 

 very fragrant, gray with a closely packed tomentum, the twigs 

 obscurely striate : leaves 2 to 4 mm. long, 1 mm, or less wide, those of 

 the end twigs only 1 to 3 cm. long and often recurved : inflorescence 

 a rounded cyme terminating each of the twigs : involucre about 7 mm. 

 high ; bracts rather obtuse, keeled, in 5 distinct vertical rows, tomen- 

 tose, not ciliate : corolla 7 to 8 mm. long ; tube sparsely pubescent with 

 , short crisp or rigid hairs ; lobes ovate, acute, erect or even eonnivent 

 around the stamen-tube, 0.5 to 1 mm. long. 



