ROSE FAMILY 403 



glabrous or stellate on both sides, thin, 2-6 cm. long and about as broad; bracts 

 spatulate or cuneate, caducous; sepals ovate, 4-5 mm. long; petals often 5 mm. 

 long; follicles 2, united nearly two-thirds their length, about 5 mm. long, dehiscent 

 after falhng. 0. -puhescens Rydb. P. malvaceus Kuntze. P. pubescens Coult. & 

 Nels. Mountains, hillsides, and rocky banks: B.C.— Ore.— Utah— Wye— Mont. 

 SubmonL — MonL My-Jl. 



9. O. alternans (M. E. Jones) Heller. Low shrub, with divaricate, gray, 

 finely stellate branches; blades orbicular or reniform, about 1 cm. long, more 

 or less deeply 3-lobed, doubly crenate, rounded or obtuse at the apex, stellate- 

 pubescent on both sides, densely so beneath; bracts oblanceolate, usually lacini- 

 ate, caducous; sepals densely stellate on both sides, ovate, obtuse; petals about 

 6 nim. long. Niellia alternans M. E. Jones. Mountains: Utah— Nev. SuhmonL 

 — Mont, Je-Jl. 



2. SPIRAEA L. Meadow Sweet. 



_ Shrubs, with simple, feather-veined leaves, which are usually serrate, and no 

 stipules. Inflorescence racemose, corymbose or paniculate. Flowers in ours 

 perfect. Hypanthium hemispherical, campanulate, or turbinate. Sepals 5, 

 T^Xa*^- ^^ ^l^shtly imbricate. Petals 5, imbricate, white to red. Stamens 

 lo-vO, inserted in 1-several series under the margin of a more or less deve^^^'*'' 



disk. Pistils K rnrplv .^— S r1iafir»/>f i'rtc.o.-f o/^l in +V.o Kr^f+i^rv^ ^f +V^^ l^,r^<^*.^ 



lum 



styles terminal; stigmas capitate or discoid; ovules 2-several, anatropous, pendu- 

 lous. Follicles leathery, not inflated, opening along the ventral suture; seeds 

 several, in ours usually 4, pendulous, hnear-lanceolate or oblong, tapering at 

 both ends; endosperm none or almost none. 



Panicle flat-topped ; sepals erect or merely spreading. 



Petals pink or rose-colored; corymb small. 1. S. densiflora. 



I'otals white, seldom tinged with rose; corymb larger. 2. S. lucida, 



I'anicle elongate, conical or ovoid, or lanceolate. 



Sepals merely spreading; disk obsolete. 



Inflorescence glabrous; leaf-blades broadly oblanceolate to obovate. 



T « 3. 5. latifolia. 



inflorescence pubescent; leaf-blades narrowly oblanceolate. 4. iS. alba. 



Sepals soon reflexed: disk usually rather conspicuous. 

 Leaves not tomentose beneath. 



Stem glabrous; leaves serrate to near the base. 5. S. idahoensis. 



Stem more or less pubescent; leaves toothed above the middle. 



Leaves tomentose beneath. 7*. S. Douglasii. 



!• S. densiflora Nutt. Low shrub, 2-6 dm. high, with ascending branches; 

 bark of the twigs dark reddish brown, glabrous; leaf -blades oval or elliptic, 

 rounded at both ends, glabrous or essentially so, bright green above, somewhat 

 paler beneath, crenate or serrate above the middle, 1.5-3 cm. long; sepals ovate, 

 obtuse; petals nearly 1.5 mm. long, obovate; foUicles glabrous and shining. 

 Mountains: B.C.— Ore.— Wyo.— Mont. SubmonL— Mont. Jl-Au. 



2. S. lucida Dougl. Low shrub, with creeping rootstock; stems and branches 

 erect, often dying down annually to near the base, 3-10 dm. high; blades of the 

 lower leaves obovate, of the upper oval, often acutish, 2-6 cm. long, thin, gla- 

 brous, shining above, paler beneath, coarsely serrate or incised; sepals triangular, 

 acute; petals white, orbicular, about 2 mm. long; folhclea glabrous, shining. 

 Mountams: B.C.— Ore.— Wyo.— Sask. Submont,—Mont. My-Jl. 



.3. S. latifolia (Ait.) Borkh. A shrub, 1-20 dm. high, branched; bark of the 

 twigs glabrous, chestnut; leaf-blades broadly oblanceolate or obovate, thin, 2-8 

 cm. long, acute, obtuse or rounded at the apex, sharply and sometimes doubly 

 serrate; inflorescence 0.5-2 dm. long and about half as wide; bracts sometimes 

 filiate; sepals triangular, acute; petals white or a httle pinkish in bud; follicles 

 glabrous and shining. Meadows: Newf.— N.C.— w Pa.— >Sask. BoreaL Je-S. 



hi a' ^' ^^^^ DuRoi. A shrub, 1-2 m. high; bark of the twigs bro^^Ti; leaf- 

 flt K \^^^^^^ firm, more or less puberulent on the veins, sharply serrate, acute 

 ^L ? ^i^ds, 3-6 cm. long; inflorescence 5-20 cm. long; sepals triangular, acute; 



stais white, about 2 mm. long; folUcles glabrous, shming. S. simplex Greene. 



^^amps and wet ground: Newf.— X.C.— la —N.D.— Sask. BoreaL Je-Au. 



