MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 55 



1 : 64; Coville, Cont. U. S. Nat. Herb. 4 : 96; Brandegee, Zoe, 4 : 205, 1893; Rothrock, 

 Wheeler Surv. 4 : 360 ; Rydb. Bull. Torr. Bot. Club, 23 : 429. 



Illustrations: Rothrock, Wheeler Surv. pi. 3, /. B. Plate i6',/. 1; dissection of 

 flower,/. 2; pistil,/. 3; stamen,/ 4.; fruiting hypanthium and calyx,/. 5. 



Stems many from the caudex, 5-10 cm. long, spreading or decumbent, branched and 

 many-flowered, silky-villous. Stipules ovate, acute, subentire. Basal leaves many with 

 petioles 2-6 cm. long, digitate, of 5 leaflets, equally silky or hirsute-villous on both sides ; 

 leaflets cuneate to obovate, crenate at the rounded summit, 1-1.5 cm. long. Stem leaves 

 smaller and often ternate. Hypanthium silky-villous, in fruit 5-7 mm. in diameter. 

 Bractlets oblong, obtuse, a little shorter than the ovate, rather acutish sepals. Petals ob- 

 cordate, a little exceeding the calyx. Stamens 20. Pistils about 20. Style filiform. 



The pubescence is quite densely silky, and the typical form is apparently without 

 glands. The petals are obcordate, slightly contracted at the base, and a little exceed the 

 calyx. It has been collected in southern California, Arizona and northern Mexico. The 

 following specimens have been examined : 



California: Rothrock, No. 324, 1875; Parry & Lemmon, No. 100, 1876; Coville 

 & Funston, No. 1672, 1891; in part; S. B. Parish, No. 1498, 1882; No. 2363, 1892; No. 

 3146, 1894. 



Loiuer California: T. S. Brandegee, 1893. 



Potentilla Wheeleri viscidula Rydberg. 



Potentilla Wheeleri Coville, Cont. Nat. Herb. 4 : 96. In part. 1893. 



Potentilla Wheeleri viscidula Rydberg, Bull. Torr. Bot. Club, 23 : 429. 1896. 



Subcespitose, rather hirsute with spreading hairs, somewhat glandular-granuliferous 

 on the calyx, pedicels, etc. ; leaflets shorter and broader, generally less than 1 cm. long. 



The following specimens have been seen by me : 



Arizona: C. G. Pringle, 1881; J. G. Lemmon, No. 158, 1881. 



California: W. G. Wright, 1879; Coville & Funston, No. 1672, 1891, in part. 



Pringle labelled his specimens Potentilla suhviscosa Greene (near P. Wheeleri Wats.). 

 I think, however, that they should be referred to P. Wheeleri rather than to P. suhviscosa, 

 as they do not have the dissected leaves and the subunguiculate petals of P. suhviscosa. 



30. Potentilla subviscosa Greene. 



Potentilla subviscosa Greene, Bull. Torr. Bot. Club, 8 : 97. 1881. 

 Rydb. Bull; Torr. Bot. Club, 23 : 430. 



