542 Rvdberg: Species from Western United States 



leaflets which are 2—3 cm. long and about 2 mm. wide, ghibrous 

 above and sHghtly strigose beneath ; raceme with a 1—2 dm. long 

 peduncle, rather lax and fcw-flowcrcd ; flowers almost sessile, about 

 12 mm. long; calyx about 7 mui. long, strigosc with dark hairs ; 

 lobes short, lanceolate and unequal ; corolla yellow; pod with a 

 stipe which is about I cm. long and curved upwards, upright, ob- 

 long, obcordate in cross-section, with the dorsal suture strongl)^ 

 inflcxed to about half-way to the ventral one, subcoriaceous, the 

 body being about 2 cm. long. 



The specimens were named A. arrcctus Gray ?, to which species, 

 it has a superficial resemblance, differing in the pod, the struc- 



ture of which places it near 



ipith 



From these it differs, however, in the short erect pod. It grows- 

 on dry hillsides. 



Oregon: Malheur, 18S5, W. C. Cuskk, I2j8 (Gray Herba- 

 ium). 



n 



Potentilla rosulata 



Glandular and viscid pubescent throughout; caudex thick and 

 lignose, topped with dense rosettes of leaves and short stems ; the 

 latter, at least in the t}^pe specimens, less than i dm. high ; basal 

 leaves 4-5 cm. long, long-petioled, pinnately 5-foliolate; stem- 

 leaves ternate, short-petioled, or the upper subsessile ; lower 

 stipules hinceolate and thin ; the upper ovate and rather thick ; 

 leaflets thick, densely viscid and glandular pubescent, broadly 

 obovate, or the terminal orbicular, deeply crcnate, or somewhat 

 cleft, 7—10 mm. long ; pedicels 5—1 5 mm. long ; hypanthiuni 

 about 5 mm. in diameter, densely viscid pubescent; bractlets 

 ovate, about half as long as the broadly triangular ovate acute or 

 acuminate sepals ; petals small, oblong, whitish or light yellow, 



about as long as the bractlets; stamens between 30 and 40; 

 anthers decidedly didymous ; pistils 20-40 ; style filiform, at- 

 tached near the apex of the ovary. 



This is nearest related to Potentilla saxosa Greene,* but differs- 



in the less numerous leaflets of the basal leaves, the much thicker 



and less incised leaflets, the shorter and stouter stems, the smaller 



In my monograph I trahsferred this species to Ilorkelia^ on account of its close- 

 resemblance to IlorkcUa Baileyi^ but a study of better material in Mr. T, S. Bran- 

 degce's herbarium has persuade<l me that I made a mistake. Tlic species is a true 

 Potcndlla. There are three species, all belonging to the Poteniilleae^ that are almost 

 identical in the vegetative parts, but still must be placed in three different genera. 

 These are : PotcittiUa saxosa Cireene, Ilurkelia Baileyi Wats,, and Purfusia saxosa: 

 T?randegce. 



