Explanations of Plates 36 to 58, Genus Atriplex. 



Plate 44 — continued. 



(10) Twig showing fruiting bracts mixing with a 



few staminate flowers, X 2. 



(11) Inflorescence of staminate flowers only, X 2. 



(12) Staminate flower taken from the inflorescence 



shown in fig. 11, X 16- 



(13) to (18) A series of fruiting bracts selected to 



show range of variation on one plant, X 2. 

 (19) Seedling grown from seed collected with the 

 plant from which the other drawings were 

 made, to show the opposite lower leaves. 

 Platk 45. 

 Atriplex powelli. (Drawn from fresh material and 

 photographs from Green River, Utah, the 

 bracts from near Grand Junction, Colorado.) 



(1) Upper portion of a plant almost entirely pistil- 



late, showing the three-ribbed leaves; X 1. 



(2) Branch of the inflorescence from a mostly 



staminate plant, X 1. 



(3) Leaf from a pistillate plant showing large size 



and characteristic venation, bottom view; 

 X 1. 



(4) Sketch of habit of a staminate plant, XO.08. 



(5) Sketch of habit of a pistillate plant, X 0.08. 



(6) Staminate flower, X 16. 



(7) A series of three fruiting bracts showing the 



characteristic transverse terminal lobe, X 2. 



(8) Vertical section of the seed showing the superior 



position of the radicle, X 16. 

 Atriplex leucophylla. (Drawn from fresh material and 

 photograph from Ventura, CaUfomia.) 



(9) An ascending branch, X 1. 



(10) Tip of a leafy shoot showing the staminate 



clusters and upper bracts, X 1. 



(11) Habit sketch of a plant, the base covered by 



blown sand, X 0.8. 



(12) Staminate flower, X 16. 



(13) Vertical section of the seed showing the superior 



position of the radicle, X 16. 



(14) A series of six bracts, all from the plant shown 



in fig. 11, showing variation in shape and 

 sculpturing; X 2. 

 Plate 46. 

 Atriplex pentandra arenaria. (Drawn from material 

 from Westport, Massachusetts, 7151 UC, 

 except the habit sketch.) 



(1) Portion of branch showing leaves, bracts, and 



a short terminal staminate inflorescence; X 1. 



(2) Habit sketch of plant, the base covered with 



blown sand; X 0.08. (From a photograph 

 taken at Nahant, Massachusetts.) 



(3) Vertical section of the seed showing the superior 



position of the radicle, X 16. 



(4) Fruiting bract with a pair of crested ap- 



pendages, X 2. 



(5) Fruiting bract from the same plant, the faces 



smooth; X 2. 



(6) Staminate flower, X 16. 



Atriplex pentandra muricata. (Material from Coahuila, 

 110219 UC.) 



(7) Portion of branch with leaves and bracts, X 1. 



(8) Two fruiting bracts from the same branch, X 2. 

 Atriplex pentandra tyjrica. 



(9) Portion of branch showing leaves and bracts 



from a plant collected in Cuba, X 1. (Brition 

 and Wilso7i 5S, NY.) 



(10) Fniiting bract from the same branch, X 2. 



(11) Fruiting bract from plant collected in Curasao, 



X 2. . (Britton and Shafer 2926 NY.) 



(12) Two leaves from the type of A. texana (= A. 



pentandra minor variation 16), X 1. 



Plate 46 — continued. 



(13) Two bracts from the same plant as 12, X 2. 

 Atriplex elegans typica. (Drawn from fresh material 



from Yuma, Arizona, except as otherwiiie 

 indicated.) 



(14) Branches heavily laden with fniiting bracta, 



X 1. 



(15) Habit sketch of a normally developed plant, 



X 0.07. 



(16) Staminate flower, X 16. 



(17) Fruiting bracts, X 2. 



(18) Cluster of fruiting bracts and an exceptionally 



dentate leaf, X 1. (Material from Durango, 

 110218 UC.) 



(19) Two bracts from the cluster shown in 18, X 2. 



(20) Vertical section of the seed showing the 



superior position of the radicle, X 16. 



(21) Branch of a plant with crested bracts, X 1. 



(Minor variation 1, var. thronberi. Material 

 from Santa Cruz Valley, Arizona, 7216 UC.) 



(22) Fruiting bracts from branch shown in 21, X 2. 

 Atriplex elegans fasciculata. (Material from Borregos 



Springs, California, 110270 UC.) 



(23) Tip of leafy fruiting shoot, X 1. 



(24) Fruiting bract showing the minutely dentate 



margins, X 2. 

 Plate 47. 

 Atriplex hracteosa. (Drawn from fresh material from 

 Manteca, California, except as otherwise 

 noted.) 



(1) Branches showing leaves, fruiting bracts, and 



staminate inflorescence; X 1. 



(2) Typical leaf showing the characteristic shape 



and dentation, X 1. (Material from Tulare, 

 California, 14100 VC.) 



(3) Staminate flower, X 16. 



(4) A series of three fruiting bracts, X 2. 



(5) Vertical section of the seed showing the superior 



position of the radicle, X 16. 

 Atriplex larighli. (Drawn from material from Tucson, 

 Arizona, 128543 UC.) 



(6) Portion of inflorescence showing fruiting bracts 



on a lower branch and long staminate 

 branches above, X 1. 



(7) Leaf from lower down, X 1. 



(8) Staminate flower, X 16. 



(9) Series of three bracts, X 2. 



( 10) Vertical section of the seed showing the superior 



position of the radicle, X 16. 

 Atriplex linifolia. (Drawn from material from 

 Durango, 110220 and 110228 UC.) 



(11) Upper portion of staminate inflorescence with 



upper leaves, X 1. 



(12) Upper portion of a chiefly pistillate inflorescence 



but with some staminate glomerules above; 

 from another plant; X 1. 



(13) Staminate flower, X 16. 



(14) A series of three fruiting bracts, X 2. 



(15) Vertical section of the seed showing the superior 



position of the radicle, X 16. 



Plate 48. 

 Atriplex microcarpa. (Drawn from matenal from 

 Laguna, Orange County, California.) 



(1) Branch showing leaves, fruiting bracts, and 



staminate clusters; X 1. 



(2) Fniiting bract, X 2. 



(3) Vertical section of the seed showing the superior 



position of the radicle, X 16. 



(4) Staminate flower, X 16. 



