316 CALIFORNIA ACADEMY OF SCIENCES. 



Described first as Obione confertifolia, by Torrey, 

 Frem., 2d Rep., 318 (1845). 



Type locality: "On the borders of the Great Salt 

 Lake." 



Widely distributed in alkaline soil and collected on 

 McElmo Creek. 



115. Atriplex cornuta Jones, Proc. Cal. Acad. Sci., 2d 

 Ser., v, 718. 



Type locality: " Green River, Utah, in clay." 



This was collected on the alkaline flats of the San Juan 



River, between Montezuma Creek and McElmo Creek; 



also on McElmo Creek. 



This is very close to A. argentea Nutt., but the leaves 



are much thinner, the horns or processes on the fruiting 



bracts more numerous, longer and more lobed. 



116. Atriplex Caput-Medusae n. sp. Plate xlvi. 

 Annual, with several erect stems from the base, about 



4 or 5 dm. high, intricately branched with slender, gen- 

 erally upward-spreading branches ; loosely scurfy through- 

 out, leaves rather thin, vertical, on petioles half as long 

 as the blades; lower leaves deltoid with obtuse apex and 

 rounded basal angles; upper becoming smaller, deltoid 

 or sub -hastate ; flowers androgynous ; staminate flowers 

 apparently few with cucullate divisions; fruiting bracts 

 orbicular, becoming hard and entirely closed, usually 

 pendent on tapering pedicels 4 or 5 mm. long, thickly 

 beset with flat, horny, acuminate and often twisted pro- 

 cesses; seed almost filling the cavity. Some undeveloped 

 fruiting bracts are cuneate, toothed or lobed, with or with- 

 out small appendages on the sides. 



This is nearest to Atriplex argentea Nutt., from which 

 it differs in habit of growth; leaves of thinner texture, 

 all petioled ; staminate flowers mixed with pistillate instead 



