685 Rydberg : Studies on the Rocky Mountain Flora 



than to A. elliptica A. Nelson. From this it differs in the upright 

 stem, which is decidedly viscid-pubescent instead of merely pu- 

 berulent. 



Utah : Salt Lake City, 1879, M. E. Jones, ijjy (type in U. S. 

 Nat. herb., also in herb. Columbia University). 



8. Abronia elliptica a. Nelson, Bull. Torrey Club, 26 : 7. 



1899 

 Wyoming and Colorado. 



9. Abronia glabra sp. nov. 



Perennial : stem ascending, about half a meter high, glabrous, 

 straw-colored: leaves thick, glabrous; petioles 1-2 cm. long; 

 blades oval to oblong, 1-4 cm. long, obtuse : peduncles oval, 2—4 

 cm. lonsr, glabrous ; bracts obovate or about ■; mm. long, acute : 

 flowers 12-15 nini- long, numerous: fruit cuneate-obpyramidal, 

 with the wings 4-5 mm. wide and y-d> mm. long : wings very 

 thick, of two lamina, semi-cordate at the apex : wingless tip of the 

 fruit very short. 



This species is intermediate between A. elliptica and the next 

 species. From the former it differs in the glabrous stem and the 

 stricter habit, from the latter in the broader and shorter bracts 

 and the smaller flowers. 



Colorado : Grand Junction, 1883, M. E. Jones (type in U. S. 

 Nat. herb.). 



10. Abronia lanceolata sp. nov. 



Perennial : stem glabrous, decumbent, several decimeters long: 

 leaves rather thick, glabrous ; petioles 2—3 cm. long ; blades ob- 

 long-oval, 2—5 cm. long, 1-1.5 cm. wide: peduncles 5—15 cm. 

 long ; bracts 6-8, lanceolate, acute or acuminate, about i cm. 

 long: flowers numerous, about 1.5 cm. long, with a limb 4—5 

 mm. wide : fruit with the thin wings about 8 mm. wide and about 

 as long, cuneate-obpyramidal in outline, puberulent : wings 

 strongly reticulate, semicordate at the apex, where the tip of the 

 achene extends for about 2 mm. 



The type was labeled A. fragrans, which species it resembles 

 in general habit, but it is easily distinguished both by the narrow 

 bracts and the strongly winged fruit. These characters place it 

 nearer A. Carlctoni Coult. & Fisher which is of a different habit and 

 has a puberulent stem. A. lanceolata grows in drifting sand. 



