514 EOS ACE AE 



sessile or short-stalked : styles terminal : stigmas capitate or disk-like. Ovules 2-many in 

 each cavity. Follicles 5, or rarely more or fewer, not inflated, opening along one suture. 

 Seeds 1-10, narrow. Testa dull. Endosperm wanting, or very scant. 



Flowers in terminal panicles. 



Foliage glabrous or nearly so : panicle broad : follicles glabrous. 1. S. salicifolia. 



Foliage tonientose(except upper leaf-surfaces): panicle narrow: follicles tomentose. 2. S. tomentosa. 

 Flowers in terminal corymbs. 



Leaf-blades 3-4 times as long as broad : sepals triangular. 3. S. Virginiana. 



Leaf-blades as broad as long or twice as long as broad : sepals triangular-ovate. 4. S. corymbosa. 



1. Spiraea salicifolia L. An erect glabrous or nearly glabrous shrub, 3-12 dm. 

 tall, with reddish branching stems. Leaf-blades thinnish, oval, elliptic or narrowly ob- 

 long, or often ranging from obovate to oblanceolate, 2-8 cm. long, sharply serrate, except 

 the more or less cuneate base : panicle broad, densely flowered, 5-20 cm. long : hy- 

 panthium campanulate, 2 mm. broad, shorter than the pedicel : sepals triangular, rather 

 obtuse, spreading : petals white or pinkish, suborbicular to deltoid-orbicular, 2 mm. long : 

 follicles 3 mm. high, glabrous, the tips recurved. 



In swamps and low grounds, Newfoundland to the Rocky Mountains, Georgia and Missouri. 

 Also in northern Europe and Asia. Summer. Meadow-sweet. Meadow Queen. 



2. Spiraea tomentosa L. An erect shrub, 3-12 dm. tall, with tomentose foliage, 

 the stem simple or nearly so, cobwebby below, closely tawny-pubescent above. Leaf-blades 

 leathery, oblong or oval, varying to ovate or oblong-ovate, 1.5-7 cm. long, sharply serrate 

 except at the cuneate or rounded base, glabrous above, white- or tawny-tomentose be- 

 neath : panicles narrow, densely flowered, 5-30 cm. long : hypanthium campanulate, 1.8 mm. 

 broad, longer than the pedicel : sepals triangular, recurved : petals pink, purple or rarely 

 white, orbicular-ovate, 1-1.5 mm. in diameter: follicles 2-2.5 mm. high, pubescent, the 

 tips spreading. 



In swamps and damp soil, Nova Scotia to Manitoba, northern Georgia and Kansas. Summer. 

 Hardhack. Steeple-bush. 



3. Spiraea Virginiana Britton. A straggling glabrous shrub, with a much branched 

 stem and wide-spreading often wand-like branches. Leaf-blades thinnish, cuneate, oblance- 

 olate or elliptic, or rarely lanceolate, 2-6 cm. long, acute or rounded at the apex, undulate, 

 serrate above the middle, glaucous beneath, cuneate or rarely rounded at the base : corymbs 

 3-9 cm. broad, naked or leafy-bracted : hypanthium turbinate or campanulate-turbiuate, 

 2 mm. broad : sepals triangular, spreading : petals white, suborbicular, more than 2 mm. 

 in diameter, crisped : follicles about 2 mm. high, glabrous. 



On rocky banks, in the mountains, West Virginia to Tennessee. Spring and summer. 



4. Spiraea corymbosa Raf. An erect glabrous or glabrate shrub, with erect simple 

 or little branched dark red stems. Leaf-blades thinnish, oval, elliptic or suborbicular, 

 varying to ovate or obovate, 2-10 cm. long, sharply or coarsely-serrate above the middle, 

 with sharp or mucronate teeth or rarely slightly lobed, rounded or subcordate at the base 

 or rarely acute : corymbs 5-15 cm. broad, naked or leafy-bracted : hypanthium broadly- 

 campanulate, 2 mm. broad : sepals triangular-ovate, spreading : petals white, suborbicular, 

 nearly 1.5 mm. in diameter, more or less curled back : follicles erect, 1.5 mm. high, glabrous. 



On rocky banks or in poor soil, in the mountains, New Jersey to Georgia. Spring to summer. 



3. ARIJNCUS Adans. 



Large perennial herbs, with erect terete sparingly branched stems. Leaves alternate : 

 blades twice or thrice pinnately compound : leaflets many, the blades toothed, membranous : 

 stipules minute or none. Flowers dioecious, in slender panicled many-flowered racemes. 

 Hypanthium persistent, spreading in age. Sepals mostly 5, narrowed upward. Petals 

 usually 5, narrow. Stamens numerous. Pistils commonly 3, alternating with the sepals : 

 stigma terminal. Ovules several. Follicles mostly 3, finally deflexed. Seeds 2 in each 

 cavity. Testa dull. Goat's-beard. 



1. Aruncus Anincus (L. ) Karst. Foliage bright green, glabrous. Stems erect, 

 1-2 m. tall : leaflets numerous, the blades ovate, oval or oblong, 4-10 cm. long, acuminate, 

 finely and unequally serrate and incised, acutish to subcordate at the base : racemes slen- 

 der, in plume-like panicles varying from 1-5 dm. in length : pedicels less than 1 mm. in 

 length : sepals ovate, about as long as the hypanthium : petals cuneate or obovate, 1 mm. 

 long, obtuse: filaments glabrous: follicles deflexed, 2-2.5 mm. long, glabrous, the tips 

 spreading. [Spimen Aruncvs L.] 



In woods or clearings. Pennsylvania to Iowa, northern Georgia and Missouri. Also in northern 

 Europe and Asia. Spring and summer. 



