683 Rydherg : Studies on the Rockv Mountain Flora 



2. Abronia nudata sp. no v. 



Perennial, stems very long and decumbent, sparingly hispidu- 

 ious : leaves thick, glabrous; petioles 2-10 mm. long; blades 

 broadly lanceolate, obtusish, 2-5 cm. long : peduncles 4-6 cm. 

 long, almost glabrous : bracts ovate-lanceolate, less than i cm. 

 long: flowers many, about 2 cm. long; limb 5-6 mm. wide: 

 achenes very irregular, the inner ones of the head bipyramidal, 

 thickest a little above the middle, crested, 8-10 mm. long, those 

 of the margin very obliquely ovoid-fusiform, scarcely at all crested. 



This species is nearest related to A. fragrans and A. ammo- 

 _phila. From the former it differs in the small bracts, smaller 

 leaves and almost glabrous stem ; and from the latter in the much 

 longer flowers and the scanty or no pubescence. 



Montana: Colgate, near Glendive, 1892, Sandbcrg, Mac- 

 Doiigal &■ Heller, 1016 (type in herb. N. Y. Bot. Garden). 



3. Abronia pumila sp. nov. 



Perennial, cae.spitose : stems ascending, about i dm. long, 

 puberulent : leaves very thick, minutely puberulent ; petioles 1-2 

 cm. long, those of the stem-leaves usually shorter than blades ; 

 these 1.5-3 cm. long, oval, elliptic or somewhat ovate : peduncles 

 2-3 cm. long, puberulent : bracts elliptic-ovate or lanceolate, 7-8 

 mm. long, short-acuminate: flowers about 12 mm. long; limb 

 about 3 mm. wide : fruit bipyramidal, /. c, tapering towards both 

 ends but more so downwards, the greatest breadth being about one 

 third from the apex, merely crested or the inner ones somewhat 

 winged. 



Dr. Heimerl referred this to A. truncala Torr., but the fruit is 

 very unlike that of that species. A. pumila is nearest related to 

 A. ammophila, from which it differs mainly in the thicker and short- 

 petioled leaves and the dwarfed habit. 



Utah : Emery, 1 894, M. E. Jones, 5445q (type in U. S. Nat. 

 herb.); six miles up Salida Caiion, 5416a. 



4. Abronia ammophila Greene, Pittonia, 4: 226. 1900 

 Abronia arenaria Rydb. Mem. N. Y. Bot. Garden, 1:137. 1900. 

 Not Menz. 1827. 



Yellowstone National Park. 



5. Abronia nana S. Wats. Proc. Am. Acad. 16 : 294. 1870 

 Southern Utah to Arizona and southern California. 



