Philadelphus californicus Benth.

Philadelphus columbianus Koehne, Gartenflora 1896: 542. 1896
Philadelphus oreganus Nutt. ; T. & G. Fl. N. Am. 1 : 595, as synonym. 1840. Philadelphus confusus Piper, Bull. Torrey Club 29 : 225, in part. 1902.
A deciduous shrub, 2-3 m. high, with ascending or spreading branches ; bark of the young twigs reddish or yellowish, glabrous or slightly hairy, of the previous season's growth and older stems gray, rarely with cross-cracks, but not exfoliating ; buds enclosed in the bases of the petioles ; petioles 5-10 mm. long ; leaf-blades lanceolate to ovate, acute, or on vigorous shoots rounded at the base, more or less acuminate at the apex, denticulate with a few teeth or entire, or on vigorous young shoots dentate, more or less hairy on both sides, the hairs often with pustulate bases, 3-ribbed or more rarely 5-ribbed, the stronger pair of laterals always arising some distance from the base of the blade ; flowering branches 5-15 cm, long, with 2 or 3 pairs of leaves and 3-9 racemose, inodorous flowers ; hypanthium glabrous; sepals lance-ovate, more or less acuminate, 6-8 mm. long, glabrous or with scattered hairs without, tomentose within ; petals elliptic or oval, rounded at the apex, white, 15-20 mm. long ; styles united half their length or nearly to the apex ; stigmas clavate ; capsule elongated-obovoid , about 12 mm. long, somewhat 4-angled below and tapering gradually into the petioles.
Type locality: Cultivated, from British Columbia?
Distribution : On river banks and hills and in copses from Idaho and British Columbia to Oregon and northern California.

Philadelphus californicus Benth. PI. Hartw. 309. 1849
Philadelphus Lewisii cahfornicus A. Gray, Bot. Calif. 1 : 202. 1876.
A deciduous shrub, 2-3 m. high, with ascending branches; bark of the young twigs reddish, glabrous, of the previous season's growth red or chestnut, exfoliating, and that of the old stems gray ; buds scarcely enclosed in the bases of the petioles ; petioles about 1 cm. long, grooved above ; leaf-blades ovate or lance-ovate, acute at both ends, entire or minutely denticulate, 3-8 cm. long, glabrous or nearly so, 3-5-ribbed, the ribs originating at the bases of the leaf-blades; flowering branches 1-2 dm. long, with 2^ pairs of leaves and a panicle of 7-20 inodorous flowers ; hypanthium glabrous ; sepals ovate, acuminate, glabrous without, tomentose on the margin within, about 5 mm. long; petals white, oval or obovate, rounded at the apex, about 1 cm. long ; stamens numerous ; styles united to the apex ; stigmas short-clavate, almost as thick as the anthers ; capsule short-obovoid , about 8 mm. long.
Type locality : Mountains of the Sacramento, California. Distribution : California, on the western slope of the Sierra Nevada.