Part 3, 1908] ROSACEAE 251 
acute at each end, coarsely and doubly serrate above, entire at the base, 3-9 cm. long, 
somewhat paler beneath; inflorescence paniculate, short-conic or ovoid; branches more or 
less hairy; hypanthium hemispheric, less than 1 mm. deep, hairy; sepals ovate, acute, 
teflexed, hairy; petals white, rounded-obovate, about 2 mm. long; follicles glabrous, 
oblanceolate, about 3 mm. long; seeds linear-lanceolate, attenuate at each end, about 2 
mm. long. By some regarded as a hybrid between S. lucida and S. Menztesii. 
TYPE LOCALITY: Dry woods of the lower Yakima River, near Clealum, Washington. 
DISTRIBUTION: Along streams and in wet places, from British Columbia to Oregon and Idaho. 
17. Spiraea subvillosa Rydberg, sp. nov. 
A shrub, 1m. high or less; bark of the twigs chestnut-brown, more or less villous 
with short fine hairs; petioles about 5 mm. long, villous-puberulent ; leaf-blades thin, oval 
or elliptic, 4-6 cm. long, 1.5-2 cm. wide, glabrous above, somewhat villous-puberulent and 
paler beneath, acute at each end or obtuse at the apex, coarsely serrate above the middle; 
inflorescence short, ovoid, or sometimes nearly flat-topped, finely villous, dense; hypan- 
thium hemispheric, about 1 mm. deep; sepals triangular-ovate, 1 mm. long, reflexed in 
fruit ; petals rounded-oval, nearly 2 mm. long, pink; follicles glabrous. Perhaps a hybrid 
between S. Douglasii and S. densiflora. 
Type collected at the Cascades of the Columbia, Oregon, 1886, Thomas Howell. 
DISTRIBUTION: Type locality and on Hood River, Oregon. 
18. Spiraea Menziesii Hook. Fl. Bor. Am. 1: 173. 1832. 
Spiraea cuneifolia Raf. New F1. 3: 67. 1838. 
Spiraea Douglasit Menziesii Presl, Epim. Bot. 195. 1852. 
A shrub, 1-1.5 m. high; bark of the twigs brown and usually puberulent, exfoliating the 
second year; that of older stems very dark, purplish; petioles 3-5 mm. long; leaf- 
blades elliptic, oblong or oval, serrate above the middle, acute, obtuse or rounded at either 
end, glabrous or puberulent on the veins, 3-10 cm. long; inflorescence paniculate, very 
dense, long and narrow, spike-like; branches villous-puberulent ; hypanthium villous- 
puberulent, hemispheric, less than 1 mm. deep; sepals pubescent, ovate, acute, reflexed ; 
petals rose-colored, suborbicular, 1.5 mm. long; follicles oblanceolate, about 2 mm. long, 
glabrous. 
TYPE LOCALITY : Northwest coast of America. . . 
DISTRIBUTION: Along streams, from southern Alaska and British Columbia to Oregon and 
Idaho. 
19. Spiraea tomentulosa Rydberg, sp. nov. 
A low shrub; twigs chestnut-brown and sparingly short-villous; buds short-villous ; 
petioles 1-3 em. long; leaf-blades elliptic, 3-5 cm. long, 1.5-2 cm. wide, serrate above the 
middle, acute at each end, finely pubescent or glabrate and green above, grayish or 
brownish, velvety beneath ; inflorescence obovoid-rounded, 7-9 cm. long, about 4 cm. wide; 
branches somewhat hairy; hypanthium hemispheric, fully 1 mm. deep, sparingly villous- 
pubescent; sepals ovate, acute, 1 mm. long, at last reflexed; petals orbicular, fully 2.5 
mm. long, white; carpels glabrous, 2.5 mm. long; stamens about 20, one-half longer than 
the petals. Intermediate between and perhaps a hybrid of S. Douglasit and S. lucida. 
Type collected in border of woods, Falcon Valley, Washington, in 1881, W..N. Suksdorf 5. 
20. Spiraea Douglasii Hook. Fl. Bor. Am. 1: 172. 1832. 
A shrub, 1-2.5 m. high; bark of twigs brown and more or less tomentose, exfoliating 
the second season; petioles short, 3-5 mm. long; leaf-blades elliptic, oblong, oval or 
oblong-cuneate, 3-10 cm. long, usually acute at each end, serrate above the middle, dark- 
green above, white tomentose beneath; inflorescence paniculate, very long and narrow, 
congested; branches tomentose; hypanthium tomentose, hemispheric, less than 1 mm. 
deep ; sepals tomentose outside, ovate, acute, reflexed ; petals rose-colored, rounded-obovate 
or oval, about 1.5 mm. long; follicles oblanceolate, nearly 3 mm. long, glabrous and 
shining. 
