56 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
InLusrrations: Pate 16, f. 6; dissection of flower, f. 7; stamen, fae pistil, 7. 9; 
fruiting hypanthium and calyx, f. 10. 
Stems many from the caudex, prostrate or spreading, sparingly hirsute, and glandu- 
liferous especially upward. Stipules oyate-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 em. 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 Mrs. R. W. Hoyt, has pinnate basal leaves with approximate spatu- 
late leaflets. The species ranges from New Mexico and Arizona to northern Mexico. 
New Mexico: E. L. Greene, 1881 (type). 
Ancona. D.J.-MacDougal, No.8, 13915. Mrs. Hoyt, 1893. 
Mexico: C. V. Hartman, No. 638, 1891. 
31. Potentilla ramulosa Rydb. 
Potentilla ramulosa Rydb. Bull. ‘Torr. Bot. Club, 23: 430. 1896. 
Intusrrations: Bull. Torr. Bot. Club, 28: pl. 276. PiatE 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 veined 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 obcordate, deeply emarginate and evidently contracted in a short claw. 
Stamens 15-20. Pistils rather few. Achenes striate. 
