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Rosaceae 219 
SIEVERSIA 
Herbs, perennial, not tall; stem simple. Leaves mostly basal; basal-leaves pinnate; 
stem-leaves simple, often bract-like. Flowers rather large, in terminal cymes. Calyx 
deeply 5-cleft; segments 5. Petals obtuse or emarginate. Stamens many. Receptacle 
dry. Pistils many; style terminal, not jointed, straight, slender, persistent, often plumose, 
not hooked in fruit. (Origin? Possibly honor of some one.) 
A. Flowers pale purplish; style plumose; plant hairy; stem-leaves not pinnatifid. W. 
C. E. (Geum triflorum.) — §, ciliata Pip. 
AA. Flowers yellow; style glabrous: plant glabrous or nearly so; stem-leaves pinnatifid. 
E. (Geum rossii; S. turbinata.) 
S. rossii R. Br. 
CERCOCARPUS MOUNTAIN MAHOGANY 
Shrubs or small trees. Leaves alternate, simple, evergreen; stipules small, wholly 
adnate. Flowers axillary, solitary. Calyx-tube cylindric, long and pedicel-like, more or 
less persistent; segments 5, short, deciduous: bractlets none. Petals none. Stamens 
15—25, on the calyx. Pistil 1, simple, free, erect: style terminal, villous. Akene 
linear-oblong, terete, villous, tailed with the persistent plumose long style. (Gk. kerkos—= 
a tail, karpos—a fruit; referring to the long-tailed akenes. ) 
A. Leaves resinous, oblong or lanceolate, |-veined, margin revolute. 
B. Shrub, leaves linear, 2—4 cm. long; calyx-lobes not half as long as the throat; 
tails of the akenes 2.5——5 cm. long. E. 
C. intricatus Wats. 
BB. Shrub or small tree; leaves oblong-lanceolate, 4-6 cm. long; calyx-lobes as 
long as the throat; tails of the akenes 57.5 cm. long. E. 
C. ledifolius Nutt. 
AA. Leaves not resinous, oblong or obovate, pinnately veined, margin not revolute. U. 
E. (C. betulaefolius for our region.) 
C. parvifolius Nutt. 
KUNZIA (Purshia) ANTELOPE BRUSH 
Shrubs, diffusely branched. Leaves mostly fascicled, cuneate, 3-lobed at apex 
(ours), white-tomentose beneath (ours), greener above (ours) ; stipules jtriangular. 
Flowers yellow, subsessile, at the ends of short lateral leafy branches. Calyx persistent, 
funnelform, 5-lobed; bractlets none. Petals clawed, yellow. Stamens about 25 een 
the calyx-throat. Carpels 1—2, free, attenuate; style long. E. (Honor of Otto 
, Kuntze, a botanist. ) K, tridentata Spreng. 
RUBUS BLACKBERRY, RASPBERRY 

Shrubs or herbs, erect or trailing, often prickly. Leaves simple or pinnately 3—7- 
foliolate; stipules adnate. Flowers white or purple, solitary or in panicles or corymbs. 
Calyx 5-lobed, persistent; tube short and open; bractlets none. Petals conspicuous, de- 
ciduous. Stamens numerous, on the calyx. Carpels numerous, rarely few, becoming 
‘drupelets; style nearly terminal, deciduous. Drupelets usually adhering to from | com- 
pound berry. (L. ruber—red; from the fruit; hence L. rubus—a bramble.) 
A. Leaves 3—5-lobed or rarely -parted. : 
B. Stem erect, 9—24 dm. high, shrub, not prickly; leaves 10—30 cm. long; fruit 
of many drupelets. W.C.E. (Bossekia parviflora.) 
R, parviflorus Nutt. (Thimble-berry) 
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