Spiraea douglasii subsp. douglasii

Spiraea roseata Rydberg, sp. nov
A low shrub ; bark of young shoots pale, glabrous and rather shining ; that of the older branches chestnut ; buds glabrous ; petioles 1-2 mm. long ; leaf-blades elliptic, 2-5 cm. long, 1-2 cm. wide, sharply serrate, with the teeth directed forward, acutish at each end or the smaller obtuse at the apex, thin, glabrous on both sides; inflorescence small and dense, oblong, 2-6 cm. long, 1-2 cm. wide; hypanthium hemispheric, 1 mm. high, glabrous; sepals triangular-ovate, acute, slightly over 1 mm. long, glabrous or nearly so, soon reflexed ; petals rose-colored, elliptic, 2-2.5 mm. long ; stamens 20-25 ; filaments twice as long as the petals ; disk inconspicuous. Intermediate between 6*. Menziesii and 6". densiflora, and perhaps a hybrid between the two.
Type collected August 13, 1895, on the shores of Petitt I^ake, Idaho, within 100 yards of the lake at an altitude of 2180 meters, B. W. Everman 304 (U. S. Nat. Herb. no. 243090) ; there also collected by Henderson.