196 Class XII. Order IV. 



PYRUS BOTRYAPIUM. Willd. Wood Pyrus, 



Leaves ovate, sharply serrate, acute, glabrous ; flow- 

 ers racemed ; petals linear ; calyx mostly smooth. 



Syn. MESPILUS CANADENSIS, $? MX. 

 MESPILUS JissoREA. MX. f. 



JlRONIA BOTRTAPIUM. PeTS. 



This is a small tree found in upland woods. Leaves ovate, 

 sometimes cordate, finely and acutely toothed, very acute, gla- 

 brous both sides. The racemes are shorter and more spreading 

 than in the foregoing species with from four to seven flowers. 

 Peduncles brownish, smooth. Calyx smooth with the segments 

 downy within. Petals white, linear-obovate, more spreading 

 than in P. ovalis. Roxbury, Brookline. May. 

 PYRUS SANGUINEA. Pursh. Round leaved Pyrus. 



Leaves oval, obtuse, finely serrate, subcordate at 

 base ; racemes few flowered ; calyx glabrous ; petals 

 linear, obtuse. 



I have specimens agreeing with the above character, formerly 

 collected in the western parts of the state, from trees of middling 

 height. May. 



203. SPIILEA. 



SPIRJEA ALBA. Ehr. White Spircea. Meadow Sweet. 



Leaves wedge-lanceolate, serrate, glabrous ; flowers 

 panicled. 



Syn. SPIRAEA SALICIFOLJA. Mich. 



A slender shrub three or four feet high, bearing large, ter- 

 minal bunches of white flowers. Stems smooth, reddish. Leaves 

 broad lanceolate, somewhat obtuse, smooth and thin, acutely 

 serrate, tapering at base. Panicle terminal, composed of small 

 flowering, branches at the top of the stem, and from the axils of 

 the upper leaves. Flowers small, crowded. Meadows and wet 

 pastures. July, August. 



SPIRJEA TOMENTOSA. L. Downy Spiraa. Hardhack. 



Leaves lanceolate, unequally serrate, downy under- 

 neath ; flowers twice racemed. Willd. 



