Rydberg : Species from Western United States 543 



petals and the shorter hairs of the receptacle. It resembles also 

 P. rivalis somewhat in habit and leaves, but it has a thick peren- 

 nial caudex, much more numerous stamens and filiform style. 



California: 29 Palms, Colorado Desert, 1898, A. H. Alvcr- 

 son (type in the herbarium of T. S. Brandcgee). 



Horkelia chaetophora 



Caudex stout, covered with the remains of leaf-stalks and 

 stipules from former years ; stems several, 1-1.5 dm. high, almost 

 scapose, finely puberulent ; basal leaves numerous, about i dm. 

 long, with 1 5-20 pairs of leaflets ; their stipules broad, brown, 

 obtuse, bristly ciliate ; leaflets 3-5 mm. long, divided to near the 

 base into linear-oblong segments, densely puberulent and tipped 

 with bristles ; cyme rather many-flowered and open ; hypanthium 

 5-7 mm. in diameter, puberulent and hirsute ; bractlets linear-ob- 

 long, one third shorter than the broadly lanceolate acute sepals ; 

 petals yellow, oblong, about equaling the sepals; stamens 10; 

 filaments filiform ; pistils about 20. 



This is intermediate between H. Utahensis and H. pygmaca. It 

 resembles the former most in habit and flowers, but has the bristles 

 and obtuse stipules characteristic to H. pygmaca. From the latter 

 it differs in the larger size of the plant and flower and the many- 

 flowered and open cyme. It grows in rocky places in the moun- 

 tains at an altitude of 3000-3400 m. 



California : Farewell Gap and Little Kern River, Tulare Co., 

 1896, C. A. Pnrpus, 140^; Keweah Peak, 1895 (both in the her- 

 barium of T. S. Brandegee). 



Horkelia Congdonis 



Perennial with a woody caudex; stems erect, 3-4 dm. high, 

 few-leaved, somewhat branched above, glandular puberulent ; basal 

 leaves 1-1.5 dm. long, with 30-40 pairs of leaflets ; stem-leaves 

 similar but smaller ; upper stipules deeply cleft ; leaflets 3-5 mm. 

 long, cleft to the base into 4-5 oblong divisions, obtuse, glandular 

 puberulent ; cyme with a few ascending branches and short-pedi- 

 celed flowers ; hypanthium campanulate, 7-8 mm. in diameter, 

 glandular puberulent ; bractlets lanceolate, one half or two thirds 

 the length of the lanceolate acuminate sepals ; sepals almost equal- 

 ing the sepals, oblong, obtuse ; stamens 20 ; filaments slightly 

 dilated, subulate ; pistils numerous. 



This is nearest related to Horkelia piirpiirasc ens, but differs in the 



