288 CALIFORNIA ACADEMY OF SCIENCES. 



22. Petalostemon candidus Michx., Fl. ii, 49, t. 37. 

 Type localities: "In Tennessee and in the region of 



Illinois." 



This grew in erect bunches about 12 dm. high, with 

 well developed spikes 10-12 cm. in length on long pe- 

 duncles. It was seen only on the sands of Recapture 

 Creek under the trees, and, on account of its erect habit 

 and greater size, was noticeably different from the form 

 common on the plains around Denver or along the Platte 

 River. 



23. Astragalus subcinereus Gray, Proc. Am. Acad., 

 xiii, 366. 



Type locality: " Mokiak Pass in the northwestern part 

 of Arizona near the Utah boundary." 



On mesas above the San Juan River, in fruit, the in- 

 flated red-mottled pods numerous. 



24. Astragalus sabulonum Gray, Proc. Am. Acad., xiii, 

 368. 



Type locality: " Southeastern border of Nevada near 

 the confluence of Muddy River with the Rio Virgen." 



Abundant under the trees on the sandy flats of the 

 San Juan River, not far from the junction with McElmo 

 Creek. 



25. Astragalus Preussii Gray, Proc. Am. Acad., vi, 

 222. 



Type locality: "Banks of the Rio Virgen near the 

 eastern borders of California." 



In fruit near the head of Willow Creek. 



It was too late for Astragalus, which is really abun- 

 dantly represented in the region. 



26. Cowania Mexicana Don, Trans. Linn. Soc, xiv, 



575 (1825). 

 Type locality: " In Mexico." 



