178 RIB 



121. PRUNUS. 



Flowers in racemes. 



Virginia'na, (wild cherry, rum cherry, cabinet cherry. O. \\ T . M. !;>) 

 racemes erect, elongated ; leaves oval-oblong, acuminate, unequally 

 serrate, glabrous both sides; petioles generally bearing 4 glands. 

 In open fields the limbs of this tree spread out into an elegant oval 

 top ; but in dense forests it grows to a very great height, with a few 

 contracted branches. 



Exotic. 



Cer"asus, (garden cherry, w. r. 12) umbel sub-peduncled ; leave lance- 

 ovate, glabrous, conduplicate. 



Domes"tica, (plum. w. M. 17) peduncles sub-solitary; leaves lance- 

 ovate, convolute ; branches thornless. 



10 1. PYROLA. (From pyrus, a pear, from the form of its leaf.) 



Rotundifo'lia, (shin leaf, pear leaf, wintergreen. O. w. J. Qj.) style de- 

 clined ; leaves rounded, or broad oval, obsoletely serrulate, sub-cori- 

 aceous, shining; petiole about as long as the lamina; scape many 

 flowered. 6 12. i. 



115. PYRUS. 



Exotic. 



Commu'nis, (pear. E. w-r. M. 17) leaves ovate, serrate, (rarely entire ;) 

 peduncles corymbed. 



Ma'lus, (apple. E. w-r. M. 17) flowers in sessile umbels ; leaves ovate- 

 oblong, acuminate, serrate, glabrous ; claws of the petals shorter 

 than the calyx ; styles glabrous. Var. sylvestris, (wild apple,) leaves 

 ovate serrate ; fruit small, austere. 



1912. aUERCUS. 



Alba, (white oak. O. M. 17) leaves oblong, sinuate pinnatifid, pube- 

 scent beneath ; lobes obtuse, entire, narrowed at their bases, parti- 

 cularly on full grown trees ; fruit peduncled ; calyx somewhat bowl 

 form, tubercled, flattened at the base ; acorn ovate. The most use- 

 ful timber in America. 70 80. f. 



1213. RANUNCULUS. (From rana, a frog.) 



A'cris, (crow foot, butter cup. O. y. M. 1J.) hairs close pressed, leaves 

 3-parted ; many-cleft; upper ones linear; peduncles terete; calyx 

 spreading. 1 2. f. 



14_o RAPHANUS. 39. 63. 



Exotic. 



Sati'vus, (garden radish, w. J. <=?>) leaves lyrate ; sihque terete; to- 

 rose, 2-celled. There are several varieties of this species one has 

 a fusiform, another a globose, another a black root, 



51. RIBES. 



Triflo'rum, (wild gooseberry. A. g. M. 17) spine sub-axillary; leaves 

 glabrous, 3 5-lobed, gash-toothed; peduncles sub S^flowered, with 



