208 Rosaceae 
7 + 
WW. Style not jointed to the ovary, at least the lower portion 
persistent; basal leaves mostly lyrate-pinnatifid. . 
Y. Petals yellow or purplish. 
Z. Calyx-segments reflexed; styles jointed above the middle, 
the top deciduous and leaving a hook, not plumose. 
GEUM (p. 218) 
ZZ. Calyx-segments erect or spreading; style not jointed, 
wholly persistent, hence not hooked, sometimes plumose. 
SIEVERSIA (p. 219) 
YY. Petals white. FILIPENDULA (p. 210) 
VV Style lateral. 
a. Petals dark purple; receptacle spongy. COMARUM (pr2ts) 
aa. Petals yellow; receptacle dry. 
b. Leaflets opposite; style attached near the base of the ovary; 
flowers in cymes; plant without stolons. ! 
DRYMOCALLIs (p. 217) 
bb. Leaflets not opposite; style attached near the middle of 
the ovary; flowers solitary; plant with stolons. 
ARGENTINA (p. 215) 
PHYSOCARPUS (Opulaster, Neillia) NINE-BARK 
Shrubs; bark shreddy. Leaves alternate, palmately 3—5-veined, more or less 
lobed, usually with stellate hairs. Flowers in corymbs. Calyx-cup hemispheric or nearly 
so; segments 5, persistent, stellate-hairy at least inside. Petals white or rarely pinkish. 
Stamens 20—40. Pistils 1—5; styles terminal. Follicles somewhat united at base; 
somewhat inflated. Seeds 2—4, obliquely pear-shaped, shining. (Gk. physd—a bel- 
lows, carpos—fruit; from the inflated follicles. ) 
A. , Carpels usually 5, 8—I0 mm. long; shrub 7 m. or less high; inflorescence-bracts 
linear-lanceolate. W.C. E. (O. opulifolius.) 
P. capitatus Kuntze (Tall Nine-bark) 
AA. Carpels usually |—2, 3—5 mm. long; shrub 2 m. or less high. 
B. Inflorescence-bracts lanceolate; follicles inflated. EF. (N. torrevi.) 
P. monogynus Coult. 
BB.  Inflorescence-bracts spatulate or cuneate; follicles laterally flat. E. (O. pau- 
ciflorus. ) P, malvaceus Kuntze 
SPIRAEA SPIRAEA 
Shrubs. Leaves simple, pinnately veined, serrate or entire, evergreen or deciduous; 
stipules none. Flowers perfect (ours), in racemes or corymbs or panicles. Calyx-tube 
campanulate to turbinate; segments 5. Petals white to red. ~ Stamens 15—70.  Pistils 
3—8, usually 5, distinct; styles terminal. Follicles leathery, not inflated. Seeds several 
(4 in ours), linear-lanceolate or oblong, tapering at both ends. (Gk. speiran—to twist ; 
some species have twisted follicles. ) 
A. Flowers red. 
B. Inflorescence flat-topped. W.C. E. (S. arbuscula. ) 
S. densiflora Nutt. (Flat Red Spiraea) 
>B. Inflorescence not flat-topped. 
C. Under side of leaves glabrous. 
D. Twigs villous-puberulent. W. C. E. 
S. menziesij Hook. 

