ROSE FAMILY 115 



2. Fruit not evidently a pome, or not at all so. 



(a) Trees or shrubs. Fruit with a stone usually of 2-5 bony 



1 -seeded carpels united. Crataegus, VI 



(6) Shrubs. Fruit with many akenes borne on the intei-ior 



of a fleshy calyx tube. Rosa, XIII 



I. PHYSOCARPUS Maxim. (OPULASTER) 



Shrubs. Leaves simple, palmately veined and lobed, peti- 

 oled. Flowers white, in terminal corymbs. Calyx spreading, 

 5-lobed. Petals 5. Stamens numerous. Pistils 1-5, short- 

 stalked ; stigma terminal ; ovaries becoming inflated at matu- 

 rity, 2-4-seeded, splitting open.* 



1. P. opulifolius Maxim. NINE-BARK. A spreading shrub, 3-6 ft. 

 high, the old bark separating into thin strips. Leaves petioled, 

 broadly ovate or rounded, often heart-shaped, 3-lobed, the lobes 

 doubly crenate-serrate ; stipules deciduous. Corymbs terminal, pe- 

 duncled, nearly globose, downy, many-flowered. Follicles 3-5, much 

 longer than the calyx, smooth and shining, obliquely tipped by the 

 persistent style. Banks of streams.* 



H. SPIRAEA L. 



Shrubs with simple leaves. Flowers perfect, in terminal 

 or axillary racemes or panicles. Calyx 5-cleft, persistent. 

 Petals 5. Stamens numerous. Pistils usually 5, free from the 

 calyx and alternate with its lobes. Follicles not inflated, 2- 

 several-seeded.* 



1. S. salicifolia L. WILLOW-LEAVED SPIRAEA. Shrubs 2-5 ft. 

 high, branches smooth. Leaves lanceolate to oblong-ovate, smooth 

 or nearly so, sharply serrate, base usually wedge-shaped, pale be- 

 neath ; stipules deciduous. Flowers white or pink, panicle dense- 

 flowered ; follicles smooth. On low ground.* 



2. S. cantoniensis Lour. BRIDAL WREATH. Shrubs 2-4 ft. tall; 

 branches long, slender, and spreading. Leaves lanceolate, serrate, 

 sometimes 3-lobed or pinnatifid, with a bloom beneath. Flowers 

 white or pinkish, in axillary racemes or corymbs, often forming 

 long wreaths. Follicles smooth. Cultivated from Europe. 



3. S. tomentosa L. HARDBACK. Erect shrubs. Stems densely 

 downy, usually simple. Leaves simple, ovate or oblong, serrate, 

 densely rusty-downy below, smooth and dark green above. Flowers 



