206 Rosaceae 
V. Calyx white; its segments narrowly lanceolate. E. : 
R. niveum Lindl. 
VV. Calyx greenish-purple, its‘segments oblong. W. C. E. 
R. divaricatum Dougl. 
UU. Calyx-lobes equal to or shorter than the tube. 
W._ Bracts much shorter than the pedicels; stamens scarcely longer than the 
whole calyx. E. (JR. oxyacanthoides and R. gracile for our region; R. 
inerme. ) R. saxosum Hook. 
WW. Bracts nearly equaling the pedicels; stamens decidedly shorter than the 
whole calyx. 
X. Leaves |.5—4 cm. wide; peduncles 2—5-flowered; calyx-tube élight- 
ly hairy, much longer than wide, cylindric; calyx-segments 2—-4- mm. 
long. E, R. cognatum Gr. 
XX. Leaves 3—7 cm. wide; peduncles 1—3-flowered; calyx-tube glab- 
rous, hardly longer than wide, campanulate; calyx-segments 5—-8 mm. 
longa, E; R. irriguum Dousgl. 
ROSACEAE Rose Family 
Herbs or shrubs or trees (not ours). Leaves usually alternate, simple or compound; 
stipules usually present. Flowers usually perfect, rarely dioicous or monoicous, solitary 
or clustered. Sepals normally 5, rarely 4 or 6—9, often with as many bractlets be- 
neath, often united at base forming a disk or cup or tube. Petals as many as the sepals 
or none. Stamens |—many, usually on the calyx; filaments distinct or rarely slightly 
united at the base. Pistils |—manv, usually wholly distinct. Ovary 1-celled; styles 
terminal or lateral or basal. Fruit akene or follicles or drupelets, sometimes on an en- 
larged receptacle. Seed 1—few. 
A. Shrubs. 
B. Leaves simple; plants not vines. 
C. Leaves 3-lobed at apex, fascicled, 6—25 mm. long, cuneate-obovate, white- 
tomentose beneath; plant 6—24 dm. high. KuUNZIA (p. 219) 
CC. Not as above in all points. . 
D. Leaves pinnately veined, or |-veined, in some pinnately lobed. 
E. Petals none; styles very long and plumose in fruit; carpels 1-seeded. — 
CERCOCARPUS (p. 219) 
EE. Petals present; styles not plumose in fruit; carpels 2- to several-seeded 
(except Holodiscus). 
F. Erect, branching; inflorescence not spicate; leaves not rosulate, not 
entire. 
G. Leaves ovate, shallowly lobed; stamen-disk adherent, entire; ovules 
2; seed |. Hovopiscus (p. 210) 
GG. Leaves mostly narrower than ovate, not lobed but often coarsely 
serrate; stamen-disk free at margin, not entire; ovules several; seeds 
several. SPIRAEA (p. 208) 
FF. Depressed caespitose; inflorescence spicate; leaves rosulate, entire. 
; PETROPHYTUM (p. 209) 
DD. Leaves palmately veined, palmately-lobed or -cleft. 
H. Stems | dm. or less long, caespitose, creeping; plant alpine; leaves 3- 
parted and the segments again 2—4-lobed; flowers in racemes. . 
LUTKEA (p. 209) 
HH. Stems 5—24 dm. high, not caespitose, erect or ascending or divaricate; 


