186 ROSACEA. spirjsa. 



shallow lobes above the middle, the general outline orbicular or oval, with 

 many slight-rounded and crenately toothed secondary lobes: corymbs 

 mostly simple, short-stalked: calyx tomentose, very large, broadly cam- 

 panulate, its lobes in maturity connivent over the fruit : carpels 2 (some- 

 times 3) not infllated, connate above the middle, compressed, erect and 

 straight at apex, indehiscent, 1- or 2-seeded : seeds large, oblong-obovate. 

 Dry rocky banks, above the northern shore of Lake Pend d' Oreille in 

 Northern Idaho. 



18 SPIRAEA Tourn. L. Gen. n. 630. 



Shrubs with simple alternate leaves without stipules and 

 white or rose-color perfect fiow T ers in compound corymbs or 

 elongated panicles or spikes. Calyx 5-cleft, persistent, the disk 

 more or less free at the margin. Petals 5, rounded, nearly ses- 

 sile, stamens numerous, perigynous, inserted with the petals in- 

 to the disk. Carpels 5, alternate with the calyx-lobes, distinct, 

 sessile, becoming dry cartilaginous several-seeded follicles, not 

 inflated. Seeds small, pendulous, linear, with a thin membrana- 

 ceous testa and no albumjn. 



S. lucida Dougl. (see Greene Pitt, ii, 221). S. betulxfolia of Ameri- 

 can authors in part, not Pall. Stems erect, mostly simple, 1-2 feet high, 

 from horizontal running and woody not deep-seated rootstocks or roots : 

 lowest leaves small, obovate to oblanceolate, the upper oval to oblong, 

 1-2 inches long, acutish, often obscurely lobed, sharply and doubly serrate 

 above the middle, narrowed below to a short petiole, glabrous throughout, 

 pale and glaucescent beneath: fiow r ers white, in a terminal glabrous com- 

 pound fastigiate corymb : calyx-lobes triangular, shorter than the tube, 

 reflexed; petals elliptical, shortly unguiculate ; stamens 15-20, filaments 

 three times as long as the petals ; carpels 5, glabrous a line or more long, 

 tipped with a style half as long, 5-8-ovuled. Common on dry wooded hill- 

 sides, Brit Columbia to Oregon and Montana. 



S. pyramidata Greene Pitt, ii, 221. S. betulxfolia of American au- 

 thors in part, not Pall. Stems erect, sometimes cespitose, often branched, 

 1-3 feet high : leaves elliptical to oblong, mostly obtuse, narrowed at base 

 to a short petiole, coarsely serrate above the middle, 1-2 inches long : 

 flowers white to rose-color, in a dense pyramidal compound panicle; calyx 

 more or less pubescent, its broadly ovate lobes about equalling the short 

 campanulate tube ; petals orbicular, less than a line long; filaments very 

 slender, not twice the length of the petals ; follicles glabrous, scarcely a 

 line long, tipped with a style of equal length. On rocky ridges, Oregon 

 and Washington. 



S. arbuscula Greene Erythea iii, 63. S. betnLrfolia var. rosea Gray. 

 Stems erect, 2-4 feet high or more, red, shedding annually a thin bark : 

 leaves ovate to elliptical, serrulate at the apex, entire below, narrowed at 

 base to a very short petiole or the lowest sessile, dark green both sides, 6-8 

 lines long : flowers deep rose-color, in small roundish leafy-bracted cor- 

 ymbs, terminating the numerous branches; calyx-lobes deltoid-ovate, not 

 reflexed, about as long as the broad tube ; petals oblong, narrowed at 

 base to a very short claw; filaments twice as long as the petals: free edge 

 of the disk obsolete or reduced to a mere ring: carpels glabrous; styles 

 shorter than the petals. Along brooks at subalpine elevations in the 

 Cascade and Sierra Nevada Mountains. 



S. Douglasii Hook. Fl. i, 172. Stems erect, 3-8 feet high, with red- 

 dish-brown bark, cespitose and forming dense patches several yards in ex- 

 tent, branching, young branches and inflorescence more or less densely 

 tomentose; leaves elongated-oblong, 1-4 inches long by 6-12 lines broad, 



