Silver Mock Orange

Philadelphus argenteus Rydb. sp. nov
A low straggling shrub, with spreading branches ; bark of the young twigs brown, but often covered by the dense white pubescence, of the previous season^s growth chestnut and exfoliating, and of the old stems gray ; buds apparently hidden in the bases of the petioles ; petioles 1 mm. long or less ; leaf-blades elliptic or oval,*usually acute at both ends, entire, 1-1.5 cm. long, leathery, densely strigose above, densely white silky-strigose beneath; flowering branches 1-2 cm. long, with 2 or 3 pairs of leaves and 1-3 flowers; hypanthium and the very short pedicel densely white-silky ; sepals ovate, acuminate, 5-6 mm. long, white-silky without, tomentulose within ; stamens about 30 ; upper free portion of the ovary sometimes with scattered hairs ; styles wholly and the oblong stigmas partly united ; capsule short-obo vate , about 7 mm. long.
Type collected at Ft. Huachuca, Arizona, in 1893, by Dr. T. E. Wilcox. Distribution : Vicinity of Ft. Huachuca.