——————— ere 
HORKELIA. : ROSACE#, 181 
IVESIA. 
H. caruifolia Rydberg l.c. Hirsute with long white hairs and more 
or less glandular: stems ascending, 6-20 inches long: stipules cut into 
many filiform segments: radical leaves 4-6 inches long, 13-21-foliolate; 
leaflets broadly cuneiform, 3-6 lines long, deeply cut into 5-9 linear lobes: 
flowers rather large, in close paniculate cymes: bractlets linear-lanceolate, 
a little shorter than the acuminate-triangular calyx-lobes: petals suborbic- 
ular or broadly obovate attenuate below to a claw; filaments deltoid, a 
line broad at base: achenes very smooth ovoid, fully a line long. In 
clayey soil southwestern Oregon. 
H. sericata Watson Proc. Am. Acad. xx, 364. White-silky through- 
out, not at all glandular: stems slender, flexuous, 6-12 inches high: 
leaves densely white-silky, the numerous leaflets crowded, 2-3 lines long, 
oblong or obovate, unequally bifid: cymes open and few-flowered; bract- 
Jets linear, nearly equalling the narrowly lanceolate acuminate calyx-lobes; 
petals narrowly obcordate, white or tinged with pink : filaments short-subu- 
late: carpels 5. On barren slopes of the Coast Mountains near the Oregon 
and California boundary. 
H. Howellii Rydberg l.c. Potentilla Howellii Greene Pitt. i, 104. Pu- 
bescent with white spreading hairs: stems slender, ascending, 10-20 
inches long: paniculately branched above: leaves narrow, on short almost 
filiform petioles ; leaflets 21-31,2-3 lines long, broadly cuneiform and deeply 
2-3-lobed, or narrow and entire: flowers in crowded few-flowered cymes; 
bractlets lanceolate, nearly as long as the lanceolate-acuminate calyx-lobes ; 
petals spatulate, obtuse, 2 lines long: filaments oblong, abruptly acumi- 
nate. On barren plains, southwestern Oregon. 
H. tridentata Torr. Pac. R. Rep. iv, 84, t.6. More or less villous 
with mostly appressed hairs: stems erect from a decumbent base, 10-20 
inches high: radical leaves 5-9-foliolate; leaflets cuneate-obovate to nar- 
rowly oblong, usually 3-toothed at the apex, 3-6 lines long: flowers on 
slender pedicles, in an open paniculate cyme; bractlets linear, shorter than 
' the lanceolate acuminate lobes of the more or less scarious calyx; petals 
linear to broadly spatulate, but little longer than the calyx: filaments 
subulate. On dry hillsides, Southwestern Oregon to California. 
_ 18 IVESIA T. & G. Bot. Wilkes 288. 
_ Low herbs with pinnate leaves, numerous small palmately or 
pedately lobed, often crowded and closely imbricate leaflets and 
white purple or yellow flowers in cymes. Calyx campanulate or 
cyathiform at base, 5-lobed with 5 alternate bractlets. Stamens 
definite, 5, 10, 15, or 20; filaments slender, narrowly subulate or 
filiform. Carpels few or solitary, upon a small villous recepta- 
cle; style filiform, subterminal. 
I. Baileyi Watson Bot. King 90. Viscidly glandular and villous: stems 
_ several, 3-6 inches long, from a thick perennial branching caudex, slender, 
branching above, exceeding the leaves; leaflets 7-21, broadly ovate or 
flabelliform, 2-3 lines long, 3-7-toothed: or parted; stipules ovate. entire 
or 2-3 toothed: flowers on slender pedicels, in a loose open cyme; calyx 
concave or broadly turbinate, the ovate-triangular acute lobes but little 
longer than the oblong obtuse bractlets; petals yellow or white, spatulate- 
oblong, not longer than the calyx; stamens 5; carpels1-5. On cliffs in 
the mountains of Southeastern Oregon to Nevada and California. 
I. Pickeringii Torr. Bot. Wilkes 288 t. 4. Densely villous with white 
silky hairs: stems 8-10 inches high: leaflets very numerous. at first closely 
imbricated, 2-5-lobed or parted or often entire, 1-4 lines long; stems 
panied above; cymes densely many- flowered; calyx 2 lines long or less; 
ractlets linear; petals yellowish, spatulate, equalling the calyx; stamens 
20; carpels 4-6. On the Klamath river and ative 
