306 CALIFORNIA ACADEMY OF SCIENCES. 



The seeds of this species are cylindrical, obliquely 

 truncate at each end, corky; embryo fills the cavity of the 

 seed. 



73. Amsonia brevifolia Gray, Proc. Am. Acad., xii, 64. 

 Type localities : " Southern Utah and Western Arizona 



to the borders of California." 



These specimens collected in Willow Creek Canon 

 have narrower leaves than typical A. brevifolia with 

 which it has been compared by Mr. M. L. Fernald at 

 the Gray Herbarium. The moniliform follicles show no 

 tendency to break into one-sided joints when ripe. In- 

 stead, they flatten out after the seeds are discharged, be- 

 coming conspicuous with their translucent texture and 

 varnished surface. The seeds are fusiform, obliquely 

 truncate at each end, light chocolate brown, faintly ribbed, 

 with a depression on one side. The seed coat is corky, 

 with embryo not filling the cavity. It was seen only in 

 fruit, but is quite common in Willow Creek Canon and 

 was met with nowhere else on the route. 



As the seeds seem so characteristic, I have described 

 them minutely. Descriptions of the seeds are not given, 

 probably because the species have been collected only in 

 flower. 



74. Asclepias involucrata Engelm., var. tomentosa 

 Eastwood, Zoe, iv, 120. 



Type localities of the variety : "Courthouse Wash and 

 the San Juan River near McElmo Creek." 



This was collected in fruit on the mesa above the San 

 Juan River beyond Butler Wash. It differs from the type 

 of the variety in narrower, longer, more acuminate leaves. 

 The follicles are canescent, 5^ cm. long, 1% cm. wide; 

 seeds are large, 11 mm. wide, 13 mm. long, ovate, light 

 brown, with a convoluted margin 2 mm. wide of a lighter 



