Explanations of Plates 24 to 35, Genus Chrysothamnus. 



Plate 29 — continued. 



(5) Head, X 3. 



(6) Flower with part of pappus removed, X 6. 



(7) Anthers, X 12. 



(8) Style, X 12. 



Chrysothamnus depressus. (Drawn from fresh material 

 from northern Arizona.) 



(9) Branch, X 1. 



(10) Head, X 3. 



(11) Flower with a part of pappus removed, X 6. 



(12) Outefr bract of the involucre, X 9. 



(13) Inner bract, X 9. 



(14) Style, X 12. 

 Plate 30. 



Chrysothamnus pyramidatus. (Drawn from material 

 collected above Oaxaca, Mexico, 87304 UC.) 



(1) Branch showing the characteristic fascicled 



leaves and the raceme-hke inflorescence, X 1. 



(2) Head showing the loosely arranged bracts, X 3. 



(3) Accessory bract from just beneath the in- 



volucre, X 9. 



(4) Outer bract of the involucre, X 9. 



(5) Inner bract, X 9. 



(6) Flower with part of pappus removed, X 6. 



(7) Style-branches, X 12. 



(8) Anthers, X 12. 

 Chrysotham7ius parryi latior. 



(9) An erect stem showing the broad leaves and 



the inflorescence, X 1. 

 Plate 31. 



Chrysothamnus parryi typicus. (Main drawing from 

 fresh material from San Juan Mountains, 

 Colorado, 205815 UC; the details are from a 

 plant collected at Leadville, Colorado.) 



(1) Erect flowering stem showing ample foliage, X 1. 



(2) Style-branche.s showing the elongated ai>- 



pendages, X 12. 



(3) An outer bract of the involucre, X 9. Inner 



bracts less attenuate, as shown in fig. 6. 



(4) Anthers, X 12. 



(5) Flower with part of pappus removed, X 6. 



(6) Head showing the loose arrangement of the 



involucral bracts, X 3. 

 Chrysothamnus parryi imulu^. (Drawn from the 

 type specimen.) 



(7) Portion of a plant showing the low spreading 



habit, X 1. 



(8) Anthers, X 12. 



(9) Flower with part of pappus removed, X 6. 



(10) Outer bract of the involucre, X 9. 



(11) Inner bract, X 9. 

 • (12) Head, X 3. 



(13) Style-branches showing the elongated ap- 

 pendages, X 12. 

 Plate 32. 



Chrysothamnus parryi vulcanicus. 



(1) Inflorescence and upper leaves, X 1. (Material 



from the southern Sierra Nevada, California, 

 126456 UC.) 



(2) A narrower inflorescence, X 1. (Material from 



upper San Joaquin River, Calif., 87221 UC.) 

 Chrysothamnus parryi nevadensis. (Material from near 

 Verdi, Nevada, 193101 UC.) 



(3) Inflorescence and upper leaves, X 1. 

 Chrysothamnus parryi asper. (Material from Charles- 

 ton Mountains, Nevada, 171476 UC.) 



(4) Inflorescence and upper leaves, the latter 



rough-pubescent with stalked glands; X 1. 

 Chrysothamnus parryi howardi. (Drawn from fresh 

 material from near Buena Vista, Colorado.) 



(5) Upper portion of plant with inflorescences, X 1. 



Plate 32 — continued. 



(6) Head, X 3. 



(7) Style, X 12. 



(8) Flower with part of pappus removed, X 6. 



(9) Outer bract of the involucre, X 9. 



(10) Inner bract, X 9. 



(11) Anthers, X 12. 

 Plate 33. 



Chrysothamnus nauseosus speciosu^. 



(1) Branch and inflorescence of a form with broad, 



heavy leaves (minor variation 68, p. 221); 

 X 1. (Material from Honey Lake Valley, 

 northeastern California.) 



(2) Leaf and heads of robust form (minor variation 



68, p. 222, C. pukherrimxLs), X 1. (Mate- 

 rial from Woods Landing, Wyo., 10662 R.) 



(3) Leafy shoot and inflorescence of typical 



speciosus, X 1. (Material from Crater Lake, 

 Oregon, 20317 UC.) 

 Chrysothamnus nauseosus gnaphalodes. (Drawn from 

 living material in the Botanical Garden of 

 the University of California, grown from seed 

 collected at Benton, California; fig. 5 from 

 a photograph taken at Benton.) 



(4) Leafy branch and inflorescence, X 1. 



(5) Habit sketch of a normally developed plant 



of sandy, well-drained soil; X 0.04. 



(6) Head, X3. 



(7) Outer bract of the involucre showing the woolly 



pubescence, X 9. 



(8) Inner bract, woolly on the exposed tip; X 9. 



(9) Flower with a portion of the pappus removed 



showing the pubescent corolla-tube and the 

 very short corolla-lobes, X 6. 



(10) Anthers, X 12. 



(11) Style-branches showing the very short appen- 



dages, X 12. 

 Plate 34. 



Chrysothamnus nauseosus typicus. 



(1) A branch of the genuine form from Laramie, 



Wyoming (July 29, 1889, Greene, UC, 

 labeled C.Jrigidus), X 1. 



(2) A branch with longer and slightly curved 



leaves (minor variation 76, p. 222, C. spedosus 

 plattensis) , X 1. (Drawn from fresh material 

 from East Denver, Colorado.) 



(3) A more widely branched inflorescence from the 



same collection as 2, X 1. 



(4) Head from the branch shown in 3, X 3. 



(5) Outer bract of involucre of same head, X 9. 



(6) Inner bract of the same involucre, X 9. 



(7) Style-branches of the flower figured in 9, 



showing the long appendages, X 12. 



(8) Anthers from the same flower, X 12. 



(9) Flower from the head shown in 4, a portion of 



the pappus removed; X 6. 

 (10) Habit sketch of a plant growing near Laramie, 

 Wyoming; X 0.08. 

 Plate 35. 



Chrysothamnus nauseosus graveolens. (Drawn from 

 fresh material and photographs from eastern 

 Colorado.) 



(1) Inflorescence and upper leaves, X 1. 



(2) Habit sketch of normal plant of good soils, 



more spreading and regular in outline than 

 in most specimens; X 0.03. 



(3) Flower with part of pappus removed, X 6. 



(4) Style, X 12. 



(5) Anthers, X 12. 



(6) Outer bract of the involucre, X 9. 



(7) Inner bract, X 9. 



(8) Head, X 3. 



