56 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Illustrations : Plate 16, f. 6 ; dissection of flower, /. 7 ; stamen, /. 8; pistil, /. 9; 

 fruiting hypanthium and calyx,/. 10. 



Stems many from the caudex, prostrate or spreading, sparingly hirsute, and glandu- 

 liferous especially upward. Stipules ovate-lanceolate, acute, entire. Basal leaves numerous, 

 with petioles 3-5 cm. long, sparingly hirsute, puberulent and glanduliferous, digitately (or 

 seldom closely pinnately) 5-foliolate with the lower leaflets smallest. Stem leaves reduced 

 and ternate ; leaflets 1-4 cm. long, obovate or cuneate in outline, deeply cleft into oblong 

 or linear-oblong divisions, and the middle one often 3-divided to near the midrib. 

 Hypanthium glanduliferous and puberulent, in age generally brownish and 5-7 mm. in 

 diameter. Bractlets oblong-ovate, obtuse, shorter than the ovate, acute or obtuse sepals. 

 Petals cuneate or spatulate, about one-half longer than the sepals. Style short, glandu- 

 lar-thickened at the base. 



Differs from P. Wheeleri in the leaflets, which are deeply cleft into oblong divisions, 

 and the middle one often 3-divided to near the midrib, in the petals, which are more or 

 less plainly unguiculate and about one-half longer than the sepals, in the more hirsute 

 pubescence which is intermixed with numerous glands. A specimen collected at Fort 

 Apache, Arizona, by ]\Irs. R. W. Hoyt, has pinnate basal leaves with approximate spatu- 

 late leaflets. The species ranges from New Mexico and Arizona to northern Mexico. 



Ne^v Mexico: E. L. Greene, 1881 (type). 



Arizona: D. J. MacDougal, No. 8, 1891 ; IMrs. Hoyt, 1893. 



Mexico: C. V. Hartman, No. 638, 1891. 



31. Potentilla ramulosa Rydb. 



Potentilla ramulosa Rydb. Bull. Torr. Bot. Club, 23 : 430. 1896. 



Illustrations : Bull. Torr. Bot. Club, 23 : pi 276. Plate 17. 



Stems several from the thick perennial root, about 1 dm. high, scarcely exceeding 

 the basal leaves, more or less hirsute, and branched. Stipules lanceolate, the lower 

 scarious and brown, the upper herbaceous. Basal leaves with hirsute petioles 5-8 cm. long, 

 finely pubescent, in age shining ; leaflets 5-7, obovate, coarsely and generally doubly 

 toothed with somewhat divergent teeth, prominently ^-eined beneath, the larger 5-7 cm. 

 long. Flowers slender-pedicelled in an open cyme. Hypanthium and pedicels hirsute 

 and with numerous sessile glands ; bractlets oblong, a little shorter than the oblong- 

 ovate sepals, both distinctly veined, in fruit incurved and enclosing the rather few large 

 achenes. Petals oljcordate, deeply emarginate and evidently contracted in a short claw. 

 Stamens 15-20. Pistils rather few. Achenes striate. 



