^56 ROSACEAE (KOSE FAMILY^ 



1. PHYSOCARPUS Maxim. Nine-bark 



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

 and shining crustaceous testa and copious albumen. Stamei.s 30-40. Other- 

 wise as Spiraea. — Shrubs, with simple palinately lobed k-aves and umbel-like 

 corymbs of white flowers. (Name from <pvaa, a pair of bellows, and /capxoj, 



friiit. ) 



1. P. opulifolius (L.) Maxim. Shrub, l-o m. high, with long branches, the 

 old bark loose and separating in numerous thin layers ; leaves roundish, some- 

 what 3-lobed and heart-shaped ; the purplish membranaceous pods usually o, 

 essentially glabrate, very conspicuous. (Spiraea L. ; Opn/asterK\ze.) — Rocky 

 banks of streams. Que. and N, E. to Fla., w to 111. — Often cultivated. 



Var. Intermedius (Rydb.) Robinson. Pods permanently pubescent. {Opn- 

 laster intermedius Rydb.) — Similar situations, s. Mich, to S. Dak., Ark., and 

 Ala. 



2. SPIRAEA [Tourn.] L. 



Calyx 5-cleft, short, persistent. Petals 5, obovate, equal, imbricated in the 

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

 Seeds linear, with a thin or loose coat and no albiunen. — Shrubs, with simple 

 leaves, and white or rose-colored flowers in corymbs or panicles. (The Greek 

 name, from (nreipav, to twist, from the twisting of the pods in some of the 

 original species.) 



Flowers in compound corymbs. 



Calyx-tube t<)i)-shaped, pubescent 1. S. japonica. 



Calyx-tube bell-shaped, smoothish. 



Leaves 2..'>-5 cm. broad 2. 8. corynibomi. 



Leaves 1-1.6 cm. broad %. S. virginiana. 



Flowers racemosely or spicately panicled. 

 Li^aves smoothish. scarcely paler beneath. 

 Pedicels fascicled. 1.5 crn. long ; flowers usually double . , . .4. 8. prunifolia. 

 Flowers densely racemo-paniculate ; pedicels '2-6 mm. long. 



Inflorescence tomentulose 5. 5. ftalicifolia. 



Inflorescence subglabrous or sparingly villous 6. .S'. laUfolia. 



Leaves green above, densely tomentose and white or tawny beneath . . 1. S. tomentosa. 



1. S. JAPONICA L. f. Stems 1 m. or more high ; leaves 7-9 cm. long, glau- 

 cous beneath; petals pink to deep rose-color. — Frequent in cultivation, and 

 occasionally escaping, s. Ct. {Graves) and e. Pa. (Introd. from Asia.) 



2. S. corymbbsa Raf. Stems erect, dark purple, simple or nearly so ; leaves 

 oval or broadly oblong, smoothish, of firm texture, toothed from near the middle 

 to the rounded or obtuse apex, 2.5-5 cm. broad ; flowers white ; corymbs 4-10 

 cm. broad. {S. hetulifoUa, var. Wats.) — In the Allegheny Mts., N. J. (accord- 

 ing to Britton) to W. Va. and Ga. 



3. S. virginiana Britton. Glabrous, much-branched ; leaves lance-oblong, 

 1-1.6 cm. broad, often acute or acutish at the base ; flowers white, about 6 mm. 

 broad ; pedicels and calyx glaucous. — On rocks W. Va. {Millspaugh) to N. C. 

 and Tenn. — Not seen ; description compiled. 



4. S. PRUNIFOLIA Sieb. & Zucc. Finely pubescent; leaves ovate-oblong, 

 obtuse, cuneate at the base, serrulate ; flowers white, often double, 1 cm. in 

 diameter. — Persisting after cultivation, and tending to escape to roadsides, e. 

 Mass. and Ct. (Introd. from Japan.) 



5. S. salicif51ia L. (Meadow-sweet.) Erect shrub, 3-12 dm. high, with 

 tough yellowish-broum stems; leaves finely serrate, lance-oblong, 5-7 cm. long, 

 1-1.8 cm. broad, rather firm in texture; inflorescence thyrsoid, tomentulose; 

 flowers 6-8 mm, in diameter; petals suborbicular, white. — Chiefly in low 

 ground, N. Y. to N. C, Mo., and north westw. (Asia.) 



6. S. latifblia Borkh. (Meadow-swkkt.) Stems red or purplish-bntwn; 

 leaves thin, more coarscUj serrate, mostly 1.5-4 cm. broad ; inflorescence smooih- 

 i.sh ; petals white or pink. — The common Meadow-sweet in e. N. A.; in rocky 

 pastures, etc., Nfd. to Va. 



7. S. toment5sa L. (Hardhack, Steeple Bush.) Stems and lower xnr- 



