98 DICOTYLEDQNOUS PLANTS. 



without glands, broad-lanceolate, acutely serrate, rugose, pubescent on 

 both sides. Prunus canadensis WiUd. 



HAB. In Penn. MM. This is supposed by Pursh to be a mere 

 variety of P. hiemdHs of Mich. 



ORDER XXXVII. ROSACE^E. land. 



Calyx 4 or 5-lobed, with a disk either lining the tube^or 

 surrounding the orifice ; the fifth lobe next the axis. Petals 5. 

 Stamens indefinite ; anthers 2-celled. Torus thick, lining the 

 tube of the calyx, bearing at its margin the stamens and pet- 

 als, and on its surface the carpels. Ovaries superior, solita- 

 ry or several, 1-celled ; ovules 2 or more, suspended ; styles 

 persistent, lateral ; stigmas usually simple and emarginate on 

 one side. Fruit either 1-seeded nuts, or acines, or follicles 

 containing several seeds. Seeds suspended, rarely ascend- 

 ing. Embryo straight, with a taper short radicle next to the 

 hilum, and flat cotyledons ; albumen, if present, fleshy. 



Herbs or shrubs. Leaves- simple or compound, with 2 sti- 

 pules at base. 



1. SPIRAEA. Linn. 



Calyx 5-cleft, persistent. Petals 5. Stamens 10 50. 

 Carpels 1 many, distinct, rarely united at base, short api- 

 culate, sessile, rarely stiped. Seeds 2 6. 



Icosandria. Di-Pentagynia. 



* Shrubby. Leaves lobcd and toothed. 



1. S. opultfolia var. tomcntdUi De Cand. : leaves ovate, 3-lobed, 

 doubly toothed and crenate, petioled, smooth ; corymbs terminal, 

 hemispherical, peduncled ; flowers numerous (30 40) trigynous ; pedi- 

 cels pubescent ; lobes of the calyx ovate, obtuse, pubescent ; capsules 

 large, inflated, compressed ; seeds obovate, shining, yellow. S. opu- 

 lifolia Pursh. Mich. Torr. 



I!AB. Banks of streams. Can. to Geor. W. to Miss. June, 

 July. *> A shrub 3 6 feet high. Flowers white, in a corymb. 

 According to De Candolle the Linnaean S. apulifolia 1ms the 

 pedicels and calyx smooth. Nine-bark. Hard-hofk. 



** Shrubby. Learu entire or toothed. 



2. 8. hyperidfolia, De Cand. : leaves obovate-oblong, 3 4 nerved, 

 entire or dentate, glabrous or slightly pubescent ; nerves pinnate ; 

 flowers in peduncled corymbs or sessile umbels ; pedicels smooth or 

 pubescent ; segment of the calyx ascending. 



b. plxktnetiana De Cand. : leaves entire, smooth, corymbs se*ile. 

 8. hyperieifolia Linn. Pursh. Muhl. 



