174 Univcrsitjj of California Publications in Botany [Vtn,. 7 



14. Chrysothamnus nauseosus var. graveolens (Nutt.) Piper. 

 C'oiitr. i:. S. Nat. Ik-rb., vol. 11, p. f).-)!). 1906. 



Chrysocoiiui (/raveoleiis Nutt., Gen., vol. 2, p. 1'Mi, 1818. 



Bigelovia (/rarcoh-ns phthrata Gray. Proc. Am. Acad., vol. 8, p. CA'), 1873. 



Shrub robust, leafy to summit : twigs yellowish green to nearly 

 white, more or less striate, the tomentum compact and smooth : leaves 

 broadly linear, 1 to 8 mm. wide, mostly 3- oi- 5-n('rv('d, impuiictate, 

 smooth and green but often slightly tomentvdose, especially beneath : 

 intiorescence a round or flat-topped cyme, fastigiate, the heads 

 crowded: involucre 6 to 9 mm. high, glabrous: corolla 6 to 9 (rarely 

 10) mm. long; lobes 0.5 to 1 or rarely 1.6 mm. long, erect. 



There can be little doubt that the original of Nuttall's Chrysoconm 

 graveolens is the plant here described, for in the brief description are 

 mentioned the linear, three-nerved, smooth leaves ; the corymboselj' 

 fastigiate and crowded "flowers"; and the smooth, five-flowered, 

 angular "calix." This is the common form in the easterly part of 

 the range of the genus, especially in Wyoming, Colorado, and 

 northern New Mexico. C. virens Greene, Pitt., vol. 5, p. 61, 1902, 

 apparently is not to be retained even in the most subordinate rank. 

 From the description it seems to be very near to graveolens but it is 

 perhaps greener, the involucre only one-half as long as the flowers, 

 and the bracts somewhat triangular. These characters are all 

 extremely variable. Although the writer has searched for it at the 

 type locality (Canon City, Colorado) and in surrounding districts, 

 DO specimens were found that could be satisfactorily separated from 

 graveolens. C. laetevirens Greene, I.e., described from material 

 gathered at Grand Junction, Colorado, has been studied at its type 

 locality. Apparently there is no reason for considering it more than 

 a light-green form or state of graveolens. 



Id. Chrysothamnus nauseosus var. calif ornicus (Greene) comb. nov. 



Chrysothamnus calif ornicus Greene, Eryth., vol. 3, p. Ill, 1895, in part. 



Shrub low and leafy-stemmed : twigs white with appressed tomen- 

 tum, leafy to the summit: leaves broad (2 to 5 mm.), narrowly 

 oblanceolate, 3-nerved, scarcely tomentulose but green and densely 

 glandular: inflorescence minutely glandular, consisting of short ter- 

 minal cymes: involucre 9 to 10 mm. high, 8 to 10-flowered ; bracts 

 thin, loose, only 2 or 3 in each vertical row, all lanceolate, attenuate, 

 not tomentose but rather densely glandular: corolla about 10 mm, 

 long; lobes 1.2 to 1.5 nnn. long; tube puberulent (not arachnoid). 



