Parr 4, 1908] ROSACEAE 
XII. GRacILEs 
Leaflets cut-toothed or cleft with lanceolate teeth. 
Leaflets with a cuneate entire base ; tomentum sparse. 
Leaflets toothed or cleft along their whole margins. 
Petioles with appressed or ascending hairs. 
Stem slender, 3-5 dm. high; inflorescence open, scarcely leafy. 
Petals 5-6 mm. long; bractlets lanceolate; leaves only spar- 
ingly tomentose beneath. 
Petals 9-14 mm. long; bractlets linear; leaves densely 
tomentose beneath. 
Stem stout, 4-7 dm. high, erect, leafy as well as the inflorescence. 
Leaves grayish-green beneath, only slightly tomentose. 
Petioles with spreading hairs. 
Leaflets of at least the stem-leaves oblanceolate, sparingly hairy 
or glabrate above ; petals often 1 cm. long. 
Leaflets obovate, densely hairy above ; plant 3-4 dm. high ; petals 
5-6 mm. long. 62 
Leaflets merely crenate with rounded or ovate teeth. 
XIII. LONGIPEDUNCULATAE 
One species. 
XIV. SuByuGaE 
One species. 
XV. SUBCORIACEAE 
Bractlets lanceolate, acute or obtuse, scarcely more than half as long 
as the sepals; stems and petioles silky-strigose. 
Stem 3-5 dm. high, more or less glandular-pubescent on the upper 
portion. 
Stem 1-2 dm. high, not at all glandular. 
oe slightly if at ail shorter than the sepals; stems and petioles 
irsute. 
Bractlets elliptic, rounded at the apex ; plant seldom over 1 dm. high. 68. 
44. P. Goldmani. 
Bractlets oblong-acute ; stem about 3 dm. high. 
XVI. 
Stamens 30-40 ; petals 1 cm. long or more. 
Stamens about 20; petals less than 1 cm. long. 
OBOVATIFOLIAE 
Petals much exceeding the sepals, nearly twice as long. 70. 
Petals usually not exceeding the sepals. 71. 
XVII. HoRRIDAE 
Pubescence very dense; plant scarcely at all glandular. 72. 
Pubescence sparser ; plant copiously glandular-atomiferous. 73. 
XVIII. RuBRAE 
Leaves all digitate. 
Leaves not velutinous. 
Leaves green, glabrate or silky beneath but without tomentum. 
Basal leaves with 3 crenate leaflets. 
Basal leaves with 5-7 coarsely toothed leaflets. 
Leaves green above, more or less white-tomentose beneath. 
Leaflets obovate to oblanceolate, serrate. 
Leaflets oblong, crenate above the middle or merely 3-5-toothed 
at the apex. 
‘Leaves softly velutinous on both sides or at least beneath. 
Basal leaves pinnate with approximate leaflets. 
Leaves tomentose beneath. 
Leaves green and slightly pubescent beneath, but not tomentose. 
XIX. AUREAE 
Leaflets almost linear, 3-toothed at the apex. . 
Leaflets oblanceolate to broadly obovate in outline, toothed or dissected. 
Leaflets toothed, the toothing not deeper than halfway to the midrib. 
Leaflets crenate with rounded or rounded-ovate, obtuse teeth. 
Leaflets obovate or oblanceolate-obovate, crenate except the 
lowest one-third ; stem more or less pubescent throughout. 
Leaves sparingly hairy or glabrate; bractlets obtuse, much 
shorter than the ovate sepals. . 
Leaves more conspicuously long-hairy; bractlets usually 
acute, slightly shorter than the lanceolate sepals. 83. 
Leaflets cuneate or obovate-cuneate, toothed only at the apex ; 
stem glabrous and straw-colored below ; leaves glabrate. 84. 
Leaflets closely toothed or cleft with lanceolate or oblong, acute or 
barely obtusish teeth or segments, 
56. 
64. 
65. 
69. 
81. 
297 
P. intermitiens. 
57. P. viridescens. 
58. P. alaskana. 
oy 
Leaves densely white-tomentose beneath ; stem densely hairy. 60. 
P. glomerata, 
P. dichroa. 
61. P. gracilis. 
. PB. camporum. 
63. 
P. filipes. 
P. longipedunculaia. 
P. subjuga. 
66. P. subcoriacea. 
67. 
P. ranunculoides. 
P. Rydbergiana. 
P, staminea. 
P. obovatifolia. 
P, leptopetala. 
P. horrida. 
P, durangensis. 
. PB. madrensis. 
. B. Thurberi. 
76. P. atrorubens, 
77, P. rubra. 
73. 
79. 
80. 
P. haematochrus. 
P. Ehrenbergiana. 
P. sanguinea. 
P. Sierrae-Blancae. 
82. P. maculata, 
P. Langeana. 
P. Vreelandit. 
