456 BOSACEAE (ROSE 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. Stamens 30-40. Other- 

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

 corymbs of white flowers. (Name from 0u<ra, a pair of bellows, and /cap?r6s, 

 fruit.} 



1. P. opulifblius (L.) Maxim. Shrub, 1-3 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 3, 

 essentially glabrate, very conspicuous. (Spiraea L. ; Opulaster Ktze.) Rocky 

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



Var. intermedius (Rydb.) Robinson. Pods permanently pubescent. (Opu- 

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

 Ala. 



2. SPIRAEA [Tourn.] L. 



Calyx 6-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 albumen. Shrubs, with simple 

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

 name, from aireipav, to twist, from the twisting of the pods in some of the 

 original species.) 



flowers in compound corymbs. 



Calyx-tube top-shaped, pubescent 1. S.japonica. 



Calyx -tube bell-shaped, smoothish. 



Leaves 2.5-5 cm. broad 2. S.corymbom. 



Leaves 1-1.6 cm. broad 8. S. virginiana. 



Flowers racemosely or spicately panicled. 

 Leaves smoothish, scarcely paler beneath. 



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

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



Inflorescence tomentulose 5. S. salicifolia. 



Inflorescence subglabrous or sparingly viilous 6. S. latlfolia. 



Leaves green above, densely tomentose and white or tawny beneath . . 7. 8. tomentosa. 



1. S. JAPONIC A 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. Steins 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. betulifolia, 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. PRUNIF6LIA 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. salicifblia L. (MEADOW-SWEET.) Erect shrub, 3-12 dm. high, with 

 tough yellowish-brown 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-SWEET.) Stems red or purplish-brown; 

 leaves thin, more coarsely serrate, mostly 1.5-4 cm. broad ; inflorescence smooth- 

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

 pastures, etc., Nfd. to Va. 



7. S- tomentbsa I,. (HARDBACK, STEEPLE BUSH.) Stems and lower sur- 



