428 The Ohio Naturalist. [Vol. XV, No. 3, 



13. Opulaster. Ninebark. 



Branched shrubs, with simple lobed leaves ; calyx campanulate, 

 5-parted; petals 5, in the throat of calyx; stamens 20-40; carpels 

 1-5; pods 1-5, dehiscent longitudinally. 



1. Opulaster opulifolius (L.) Ktz. Ninebark. Shrub 3-10 

 ft. high, the bark peeling off in strips; leaves ovate-orbicular, 

 3-lobed, coarsely dentate; flowers white or purplish, in terminal 

 corymbs; follicles dehiscent along two sides. General. 



14. Spiraea. 



Shrubs with bisporangiate, pink or white flowers, borne in 

 panicles, racemes, cymes or corymbs; sepals and petals 4 or 5; 

 stamens 20-60, distinct; carpels usually 5, alternate with the 

 sepals; follicles 5; seed pendulous, testa dull. 



1. Leaves finely serrate, not tomentose; flowers borne in tomentulose 



panicles. S. alba. (1). 

 1. Leaves unequally and coarsely serrate, tomentose; flowers borne in 



narrow, dense, brownish tomentose panicles. S. tomentosa. (2). 



1. Spiraea alba DuR. Narrow-leaf Spiraea. Tall shrub, 

 sometimes 6 ft.; leaves narrowly lanceolate, sharply and finely 

 serrate; flowers white, borne in narrow panicles; fruit glabrous. 

 General. 



2. Spiraea tomentosa L. Steeple-bush (Spiraea). Erect, 

 shrubby, usually tomentose; leaves ovate, 1-2 in. long, unequally 

 serrate, glabrous and dark green above, wooly pubescent below; 

 flowers pink or pttrple, in dense terminal panicles. Stark, Hocking, 

 Cuyahoga, Summit, Portage, Lucas, Gallia, Wayne, Fairfield, 

 Jackson. 



15. Aruncus. 



Perennial herbs, leaves usually 2-pinnate, flowers diecious, 

 almost sessile in panicled spikes; calyx usually 5-lobed; petals 

 white, as many as the lobes of the calyx; carpels usually 3; style 

 persistent; follicles reflexed, splitting on the ventral suture. 



1. Aruncus aruncus (L.) Karst. Aruncus. Herb, erect, 

 glabrous, 3-0 ft. high; leaflets ovate, lanceolate, acuminate, 

 rounded or cordate at the base; sharply and doubly serrate. 

 Monroe, Columbiana, Tuscarawas, Gallia, Licking, Fairfield, 

 Lawrence, Hocking, Jackson, Belmont, Vinton, Scioto. 



10. Dalibarda. 



Low perennial herb with creeping stems and simple, orbicular, 

 cordate, crcnatc leaves, flowers 1 or 2, borne on a scape-like 

 petiole, of two kinds, a few upright sterile ones, the others fertile, 

 cleistogamous and without petals. 



1. Dalibarda repens L. Dalibarda. Low downy herbs; 

 sepals of the sterile flowers spreading, those of the cleistogamous 

 flowers converging and enclosing the fruit. Ashtabula County. 



