FLOWERING PLAXTS AND FERNS OF ARIZONA 759 



4. Plagiobothrys cognatus (Greene) Johnston, Arnold Arboretum 



Contrib. 3: 59. 1932. 



Allocarya cognata Greene, Pittonia 4: 335. 1901. 



Flagstaff and Fort Valley (Coconino County), about 7.000 feet, 

 wet soils in the pine belt. Utah, Nevada, and northern Arizona. 



5. Plagiobothrys pringlei Greene. Pittonia 1: 21. 1887. 



Echidiocarya arizonica A. Gray, Amer. Acad. Arts and Sci. 

 Proc. 11: 89. 1876. 



Verde Mesa (Yavapai ? County), and Maricopa, Pinal, and Pima 

 Counties, mostly in the creosotebush belt, type from Verde Mesa 

 (Smart). Central Arizona to northern Sonora. 



6. Plagiobothrys californicus Greene, Calif. Acad. Sci. Bui. 2: 407. 



1887. 



Creek banks near Prescott, Yavapai County (Nelson 10232, the type 

 of P. micranthus), and in the Santa Catalina and Santa Rita Moun- 

 tains, Pima County (Graham 3463, 3538), about 4,500 feet. Central 

 and southern Arizona and southeastern California. 



The Arizona form is var. fulvescens Johnston (Plagiobothrys micran- 

 thus A. Nels.). The species is very closely related to P. pringlei, 

 which it resembles in all details except the separate unstalked nutlets 

 and the slightly shorter calyx tube. It is possible that collectors have 

 mistaken the plant for the more common and better known relative 

 and so have failed to collect it. Consequently it may be more common 

 and widely distributed than the few specimens at hand indicate. 



10. AMSINCKIA. Fiddlexeck 



Bristly erect herbs with scorpioid cymes of yellow or orange flowers; 

 corolla heterostyled, with an elongate tube, the appendages of the 

 throat reduced or absent ; leaves alternate ; gynobase pyramidal ; plants 

 of dry open places. 



The plants are very abundant on sandy or gravelly soil in western 

 and southern Arizona and are reported to make good spring forage 

 while young. On the other hand it has been reported recently that 

 horses, cattle, and swine eating the nutlets may develop cirrhosis of 

 the liver. 



Key to the species 



1. Nutlets tuberculate, roughened by short ridges and a distinct dorsal keel; 

 calyx 5-lobed, the lobes all distinct; corolla tube 10-nerved below the 

 stamens 1. A. intermedia. 



1. Nutlets tessellate, the ridges and dorsal keel low and usually rounded: calyx 

 (except in early flowers) 2- to 4-lobed, the broader lobes 2- or 3-dentate 

 at apex; corolla-tube 20-nerved below the stamens 2. A. tessellata. 



1. Amsinckia intermedia Fisch. and Meyer, Index Sem. Hort. Petrop. 

 2: 26. 1836. 



Amsinckia echinata A. Gray, Amer. Acad. Arts and Sci. Proc. 

 10: 54. 1874. 



Mohave County southward and eastward to Cochise, Pima, and 

 Yuma Counties, chiefly in the creosotebush belt. Western New 

 Mexico to California. 



