Milk-white Lupine—Lupinus lacteus.
Quaker Bonnets—L. laxiflorus.
There are numerous kinds of Lathyrus, widely distributed and difficult to distinguish. In technical character and habit they very much resemble Vetches, but sometimes have no tendrils and the flowers are larger, the leaflets are broader, and the style is flattened and hairy, not only at the tip, but also along the upper side. The leaflets are equal in number, the leaf-stalk usually terminating in a branching tendril; the flowers are in clusters; the calyx with five teeth, the upper commonly shorter; the style flattened and usually twisted; the pod flat or cylindrical, with no partitions between the seeds. Lathyrus is the old Greek name of the Pea.
Narrow-leaved Sweet Pea
Láthyrus graminifòlius
Pink and violet
Spring
Arizona
This has flowers resembling the cultivated Sweet Pea, but the whole effect is more airy and graceful. It is a loosely-trailing vine, with slender, angled stems, long, narrow leaflets, eight in number, and three-cleft tendrils. The flowers are about three-quarters of an inch long, brightly yet delicately tinted with shaded pink and violet, and are so lightly poised on the long slender stalks that they look like a row of butterflies about to take flight. This grows on the plateau in the Grand Canyon and all through Arizona in the mountains.
Utah Sweet Pea
Láthyrus Utahénsis
Lilac
Spring, summer
Utah, Col.
A smooth, trailing perennial, very graceful, with beautifully tinted flowers and bright green foliage. The stipules are large, broad and leafy, and the leaflets are usually ten in number, veined and thin in texture, one or two inches long, with tendrils. The flowers are nearly an inch long, from four to eight in a cluster, on a long flower-stalk; the standard pinkish-lilac, delicately veined with purple, the wings pale lilac and the keel cream-color. The flowers, as they fade, although keeping their form, gradually change in color to all shades of blue, turquoise, and sea-green, finally becoming buff, so that the effect of the whole cluster is iridescent and very lovely. This grows on mountain slopes, often in oak-thickets, clambering over the bushes to a height of several feet and clinging to everything with its tendrils.
Wild Sweet Pea—Lathyrus graminifolius.
Utah Sweet Pea—Lathyrus Utahensis.