ROSACEA. (rose FAMIF.Y.) 1^)'.] 



2. SPIR^A, L. Meadow-Sweet. 



Calyx 5-cleft, short, persi.>^tfiit. Petuls 5, <»l»<>v:ite, e(|u;il, imbricated in tho 

 bud. Stamens 10 - 50. Pods (follicles) 5 - 8, not inflated, few - several-seeded. 

 Seeds linear, with a thin or loose coat and no albumen. — Shrubs or perennial 

 herbs, with simple or pinnate leaves, and white or rose-colored flowers in co- 

 rymbs or panicles. (The Greek name, from a-rrfipdw, to ticist, from the twisting 

 of the pods in the original species.) 



§ 1 . SPIRj'EA proper. Erect s/irnbs, roith simple leaves ; stipules obsolete : pods 

 mostljj .5, several-seeded. 



1 S. betulsefblia, Pall., var. corymbbsa, Watson. Nearly smooth (1 - 

 2*^ high) ; leaves oval or ovate, cut-toothed toward the apex ; corijmhs larr/f, fiat, 

 several times compound ; flowers ivhite. (S. corymbosa, Raf.) — Mountains of 

 Penn. and N. J. to Ga., Avest to Ky. and Mo. 



2. S. salieifblia, L. (Common Me ado w-Swei;t.) Xenrli/ smooth (2- ti° 

 high) ; leaves wedge-lanceolate, simply or doubly serrate ; Jloirers in a crowded 

 pdiiiele, white or Hesh-color ; pods smootii. — Wet or low grounds, Newf. to the 

 mountains of Ga., west to Minn, and Mo. ; also to the far northwest. (Ku.) 



3. S. tomentdsa, L. (Hardhack. STEErLE-Busn.) Stems and lower 

 surface of the ovate or oblong serrate leaves veri/ woolli/ ; flowers in short racemes 

 crowded in a dense panicle, rose-color, rarely white; pods woolly. — Low 

 grounds, N. Scotia to the mountains of Ga., west to Minn, and Kan. 



§ 2. ULMARIA. Perennial herbs, ivith pinnate leaves and panicled ci/mose 

 Jlowers ; stipules kidney form ; pods 5-8, 1 - 2-seeded. 



4. S. lob^ta, Jacq. (Queen of the Prairie.) Glabrous (2-8° high); 

 leaves interruptedly pinnate; the terminal leaflet very large, 7-9-parted, 

 the lobes incised and toothed ; panicle compound-clustered, on a long naked 

 peduncle ; flowers deep peach-blossom color, handsome, the petals and sepals 

 often in fours. — Meadows and prairies, Penn. to Ga., west to Mich., Ky., and 

 Iowa. 



§ 3. AR UNCUS. Perennial herbs, with dio'cious whitish foivers in mam/ slender 

 s])ikes, disposed in a long compound panicle ; leaves thrice pinnate ; stipules 

 obsolete; pods 3-5, several -seeded ; pedicels reflexed in fruit. 



5. S. Anincus, L. (Goat's-Beari>.) Smooth, tall; leaflets thin, lan- 

 ceolate-oblong, or the terminal ones ovate-lanceolate, taper-pointed, sharply cut 

 and serrate. — Rich woods, N. Y. and Penn. to Ga. in the mountains, west to 

 Iowa and Mo. 



3. PHYSOCARPUS, Maxim. NixE-nAKK. 



Carpels 1-5, inflated, 2-valved ; ovules 2-4. Seeds roundish, with a smooth 

 and shining crustaceous testa and copious albumen. Stamens 30-40. Other- 

 wise as Spirrea. — Shrubs, with simple palmately-lobed leaves and umbel-like 

 corymbs of wliite flowers. (Name from <pv(ra, a bladder, and Kaptr'os, fruit.) 



1. P. opulif6Iius, Maxim. Shrub 4-10° high, with hmg recurved 

 branches, tlie old bark loose and separating in numerous thin layers; leaves 

 roundish, somewhat 3-lobed aiul heart-shajjed ; the purplish membnuiaceous 

 pods very conspicuous. (Spiraea opulifolia, L. Neillia opulifolia, Benth. <j- 



