There are several kinds of Anogra, resembling Onagra, but with white or pink flowers and the seeds differently arranged; the stems often clothed with papery bark; the buds drooping. The name is an anagram of Onagra.
Prairie Evening Primrose
Anogra albicàulis. (Oenothera)
White
Spring, summer
Southwest, etc.
A conspicuous kind, often growing in large patches, with whitish, downy, branching stems, from a few inches to a foot tall, often with shreddy bark, and downy, pale bluish-green leaves, more or less toothed. The drooping, downy buds are tinted with reddish-pink and the lovely flowers are from one and a half to three inches across, with pure white petals, tinted with yellow at base, changing to pink after pollination and fading to crimson. The stamens have cobwebby threads, white filaments, and yellow anthers, the pistil is green and the curved capsule is downy or hairy. The whole color scheme, of pale sea-green foliage, reddish buds, and white, rose-color, and crimson flowers, is delicate, harmonious, and effective. This grows in sandy places, and on the prairies from Dakota to Mexico.
Cut-leaved Evening Primrose
Anogra coronopifòlia (Oenothera)
White
Summer, autumn
Ariz., Utah, etc.
A pretty plant, with an erect, leafy stem, six inches to two feet tall, springing from running rootstocks, and pale green, more or less downy, leaves, finely cut into numerous, small, narrow lobes, so that they look like rather dry little ferns. The delicate flowers are the usual Evening Primrose shape, about an inch across, in the axils of the leaves, with pure white petals, greenish at the base and turning pink in fading, and a calyx-tube two inches long, with turned-back, pinkish-green lobes. The anthers are brown, the pistil green, the throat of the corolla is closed by a fringe of white hairs, the buds are drooping and the capsule is oblong and hairy. This is common on prairies and plains, from Nebraska to Utah, and south to New Mexico, reaching an altitude of nine thousand feet.
Prairie Evening Primrose—Anogra albicaulis.
There are several kinds of Onagra, differing from Anogra in having yellow flowers and in the arrangement of the seeds; with stems; leaves alternate, with wavy or toothed margins; buds erect; flowers night-blooming, in terminal clusters; calyx-tube long; petals four; stamens eight, equal in length; stigma four-cleft; capsule four-angled, more or less tapering.
Evening Primrose
Ónagra Hóokeri (Oenothera)
Yellow
Summer
West
A fine biennial, with stout, leafy stems, from three to six feet high, bearing splendid flowers, over three inches across, with clear yellow petals, fading to pink, and reddish calyx-lobes. The leaves, stems, and buds all downy and the buds erect. The stigma has four, slender lobes, forming a little cross, and the yellow pollen is loosely connected by cobwebby threads, clinging to visiting insects, and is thus carried from flower to flower; the capsule is an inch long. This is much handsomer than the common Evening Primrose, O. biénnis, and especially fine in Yosemite. As the mountain shadows begin to slant across the Valley the blossoms commence to open, until the meadows are thickly strewn with "patens of bright gold." They stay open all night, withering with the noonday sun.