ZUNI AND COLORADO RIVERS. 177 



Plate 8. Eriogonum alatum. • 



Fig. 1, involucre ; fig. 2, a single flower, with its bract ; fig. 3, the pistil ; fig. 

 4, achenium ; fig. 5, transverse section of the same ; fig. 6, the seed ; fig. 7, the 

 embryo — all magnified. 



Plate 9. Eriogonum orthocladon. 



Fig. 1, an involucre ; fig. 2, perigonium and bracteole ; fig. 3, achenium — 

 all magnified. 



Plate 10. Eriogonum effusum/3? leptophyllum. 



Fig. 1, involucre and flowers ; fig. 2, a separate flower ; fig, 3, a stamen ; fig. 

 4, the pistil — all magnified. 



Plate 11. Eriogonum pharnaceoides. 



Fig. 1, an involucre ; fig. 2, a flower, with its bracteole ; fig. 3, an exterior 

 sepal ; fig. 4, an interior sepal ; fig. 5, an achenium ; fig. 6, the embryo — all 

 magnified. 



Plate 12. Eriogonum umbellatum. 



Fig. 1, involucre and flowers, moderately enlarged ; fig. 2, a single flower, 

 without its pedicel — more magnified ; fig. 3, an exterior sepal ; fig. 4, an interior 

 sepal ; fig. 5, a stamen ; fig. 6, an achenium ; fig. 7, transverse section of the 

 same ; fig. 8, the embryo — all magnified. 



Plate 13 Acanthochiton Wrightii. 



The principal figure on the right hand is the male plant, and that on the left 

 the female. 



Fig. 1, a mature utricle, with its persistent styles ; fig. 2, the seed ; fig. 4, 

 transverse section of the same ; fig. 3, the embryo ; fig. 5, a male flower ; fig. 

 6, a sepal ; fig. 7, a stamen — all magnified. 



Plate 14. Obione lentiformis. 



Fig. 1, the fructiferous bracts, magnified ; fig. 2, the achenium, more magni- 

 fied. 



Plate 15. Juglans rupestris. 



Fig. 1, the fruit ; fig. 2, a nut ; fig. 3, the same, cut transversely — all of the 

 natural size. 



Plate 16. Juglans rupestris, 0? 



Fig. 1, the fruit ; fig. 2, a nut — both of the natural size. 



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