52 1 ROSACEAE 



sycamore. This species, no doubt, is found in every county of the state 

 except Benton County. It grows in low woods and on the low borders of 

 lakes and streams. While it thrives in places that are inundated, it is not 

 found in the "flats" of southeastern Indiana. It is an infrequent to a 

 frequent tree but rarely forms a thick stand over several acres. 

 Maine, Ont. to Nebr., southw. to the Gulf States and Tex. 



126. ROSACEAE B. Juss. Rose Family 



Stems armed more or less with prickles, woody; leaves compound. 



Flowers white; fruit an aggregate of drupelets, mostly black (one species with red, 

 one with reddish purple, and one variety with amber fruit); stems biennial.... 



3353. Rubus, p. 555. 



Flowers of all the native and most of the introduced species pink (a few introduced 

 species with white flowers); fruit a fleshy hypanthium, red, rarely greenish; 



stems perennial 3389. Rosa, p. 573. 



Stems not armed with prickles (thorny in Crataegus) . 

 Plants woody. 

 Leaves simple. 



Shrubs or small trees generally well armed with conspicuous thorns (a few 

 species rarely nearly thornless) ; flowers white, rarely pinkish, corymbose; 

 fruit a pome, red, green streaked with red or yellowish, containing 1-5 bony 



carpels 3345. Crataegus, p. 533. 



Shrubs or small trees without thorns. 



Flowers purplish; fruit rose purple, an aggregate of drupelets 



3353. Rubus odoratus, p. 558. 



Flowers white or pinkish; fruit not an aggregate of drupelets except in Rubus 

 pubescens. 

 Flowers in long or short racemes. 



Fruit a berrylike pome with 10 incomplete cells, each cell with a seed. . . . 



3343. Amelanchier, p. 531. 



Fruit a fleshy drupe with one stone 3396. Prunus, p. 578. 



Flowers in umbels, umbel-like clusters, cymes or panicles. 



Flowers in terminal panicles or corymbs, usually more than 20 flowers 



in an inflorescence; flowers usually less than 1 cm in diameter; fruit 



of 1-5 follicles, each with 1-7 seed. 



Bark shreddy; spreading shrubs; leaves ovate to nearly orbicular, most 



of them more or less lobed; follicles inflated, 7-10 mm long, 



2-3-seeded 3316. Physocarpus, p. 526. 



Bark not shreddy; erect shrubs; leaves narrowly oblanceolate or ovate- 

 lanceolate; follicles not inflated, about 3 mm long, generally 2-7- 



seeded 3319. Spiraea, p. 526. 



Flowers in terminal or lateral clusters, fewer than 20 flowers in an 

 inflorescence; flowers more than 1 cm in diameter; fruit a pome or 

 drupe. 

 Fruit a pome, green, yellowish green, or black. 



Fruit 2-4.5 cm wide, green or yellowish green, depressed-globose or 

 pyriform (rarely elongate in the wild apple). 

 Petals pinkish, rarely white; styles more or less united; fruit de- 

 pressed-globose, rarely elongate 3338A. Malus, p. 528. 



Petals white; styles free to the ovary; fruit more or less pyriform. 



3338. Pyrus, p. 528. 



Fruit about 1 cm wide, black 3338C. Aronia, p. 530. 



Fruit a drupe, red or purplish black 3396. Prunus, p. 578. 



Leaves compound. 



