Explanations of Plates 1 to 23, Genus Artemisia. 



Plate 12 — continued. 

 Artemisia scopulorum. (Drawn from fresh material 

 from Pike's Peak, Colorado, except fig. 2.) 



(2) Entire plant of a much reduced alpine form 



from La Sal Mountains, Utah (175205 

 UC); X 1. 



(3) Average plant, X 1. 



(4) Ray-flower, X 16. 



(5) Style of ray-flower, X 24. 



(6) Disk-flower, X 16. 



(7) Style of disk-flower, X 24. 



(8) Head, X 8. 



(9) Outer bract of the involucre, X 16. 

 (10) Inner bract, X 16. 



Plate 13. 



Artemisia dracunculus typica. (Drawn from living 

 plants in eastern Colorado.) 



(1) Upper portion of inflorescence, X 1. 



(2) Lower portion of stem, with foliage, X 1. 



(3) Habit sketch of a portion of a plant, X 0.1 



(4) Outer bract of the involucre, X 16. 



(5) Inner bract, X 16. 



(6) Ray-flower, X 16. 



(7) Style of ray-flower, X 24. 



(8) Disk-flower, X 16. 



(9) Style of disk-flower, showing 2 very short 



lobes; X 24. 



(10) Style of disk-flower, showing deeper cleavage; 



X24. 



(11) Head, X 8 

 Plate 14. 



Artemisia campestris typica. (Material from Branden- 

 burg, 6488 Baker Herb.) 



(1) Inflorescence, X 1. The details of the heads 



and flowers are identical with those of sub- 

 species pacifica. 

 Artemisia campestris pacifica. (Drawn from fresh 

 material from Manitou, Colorado.) 



(2) Inflorescence, X 1. The two portions were 



continuous; other inflorescences on the same 

 plant were more widely branched, but the 

 branches were all close and more nearly 

 erect than in fig. 1. 



(3) Habit sketch, X 0.1. 



(4) Basal leaf, X 1. 



(5) Head, X 8. 



(6) Outer bract of the involucre, X 16. 



(7) Inner bract, X 16. 



(8) Ray-flower, X 16. 



(9) Style of ray-flower, X 16. 



(10) Disk-flower, X 16. 



(11) Style of disk-flower, X 24. 

 Plate 15. 



Artemisia campestris borealis. 



(1) A plant with a narrow inflorescence, X 1. 



(Material from Mount Albert, eastern 

 Quebec, 147968 UC.) 



(2) A more spreading inflorescence, see minor 



variations, X 1. (Material from Mount Ste. 

 Abbe, Gaspe County, Quebec, 69740 UC.) 



(3) Basal leaves from the same plant as fig. 2, X 1. 



(4) Habit sketch of the plant represented in 



figs. 2 and 3, X 0.14. 

 Artemisia campestris spithamaea. (Material from 

 Saguache Mountains, Utah, 91237 UC.) 



(5) Style of disk-flower, showing cleavage on one 



side, X 24. The style-branches are com- 

 pletely fused in most of the flowers. 



Plate 15 — continued. 



Artemisia campestris pycnocephala. (Drawn from 

 fresh material from Carmel, California.) 



(6) Upper portion of the inflorescence, X 1. 



(7) Head, X 8. 



(8) Ray-flower, X 16. 



(9) Style-branch of ray-flower, X 24. 



(10) Disk-flower, X 16. 



(11) Style-branch of disk-flower, X 24. 



(12) Leaf, X 1. 



Plate 16. 



Artemisia pedatifida. (Material from western Wyo- 

 ming; partly fresh, partly herbarium speci- 

 mens.) 



(1) Portion of a plant, showing habit and inflores- 



cence, X 1. 



(2) Leaf, X 3. 



(3) Outer bract of the involucre, X 16. 



(4) Inner bract, X 16. 



(5) Head, X 8. 



(6) Style-branch of ray-flower, X 24. 



(7) Ray-flower, X 16. 



(8) Disk-flower, X 16. 



(9) Style of disk-flower, showing the distinct 



branches, X 24. 



(10) Style of disk flower, showing the branches 



fused along one side; X 24. 

 Artemisia filifolia. (Drawn from fresh material from 

 Caiion City, Colorado, the details from Will- 

 co.\ Flat, Arizona, 195188 UC.) 



(11) Upper portion of stem and inflorescence, X 1. 



(12) Style of disk-flower, X 24. 



(13) Disk-flower, X 16. 



(14) Head, X 8. 



(15) Style of ray-flower, X 24. 



(16) Ray-flower, X 16. 



(17) Outer bract of the involucre, X 16. 



(18) Inner bract, X 16. 



Plate 17. 

 Artemisia spinescens. (Material from sandy benches 

 near Barstow, California, 126503 UC, except 

 fig. 2.) 



(1) Branch showing spiny habit and the arrange- 



ment of the heads, X 1. 



(2) Habit sketch, X 0.125. 



(3) Leaves showing different degrees of lobing, X 3. 



(4) Ray-flower, showing the loose pubescence of 



the achene and corolla; X 16. 



(5) Style of ray-flower, X 24. 



(6) Head, X 8. 



(7) Inner bract of the involucre, X 16. 



(8) Outer bract of the involucre, X 16. 



(9) Disk-flower, showing the loose pubescence of 



the corolla; X 16. 

 (10) Style of disk-flower, X 24. 

 Plate 18. 

 Artemisia tridentata typica. (Drawn from fresh ma- 

 terial from northwestern New Mexico.) 



(1) Typical inflorescence, X 1. 



(2) Leafy shoot, showing tridentate leaves, X 1- 



(3) Head, X 8. 



(4) Outer bract of the involucre, X 16. 



(5) Inner bract, X 16. 



(6) Flower with scattered resin-granules, X 16. 



(7) Style, X 24. 



(8) Habit sketch of a common form, from a photo- 



graph of a plant at Wells, Nevada; X 0.04. 



