High Bush Blackberry (Rubus Alleghenien-Sis) is a tall branching shrub with slender brown stems, from three to ten feet long, armed with stout, slightly recurved prickles. It is from this species that the well known variety was developed. The leaves are divided into three to five ovate, pointed, toothed leaflets with a ribbed and hairy surface. The flowers have five green sepals alternating with the narrow white petals. This species is common everywhere.
A. Common Cinquefoil; Five-finger.
B. Silvery Cinquefoil.
This species is the most common of the Five-fingers, and is also one of our most common wild flowers, in pastures and along roadsides. It has a long period of bloom and flowers may be found from April until August. It is often mistaken for the Wild Strawberry, because of a similarity between the leaves of the two species, although those of this species have five divisions while those of the Strawberry have but three. The flowers are shaped like those of the Strawberry, but have bright yellow petals.
The flowers are solitary, on long, slender stems from the axils of the leaves near the ends of the trailing branches, that grow from 6 to 24 inches long. This species is very common in the United States and southern Canada.
Silvery Cinquefoil (Potentilla Argentea) is a common and very handsome species found in dry, barren ground throughout our range, but most abundantly near the coast. It is smaller than the proceeding, being from 5 to 12 in. high. The little, yellow flowers are clustered at the ends of the branches. The stems and the undersides of the divided and deeply cut leaves, are covered with fine, white, silvery wool, contrasting sharply with the dark green of the upper surfaces. This species bloom from May until September.
Shrubby Cinquefoil (Potentilla Fructicosa) is a very leafy and much branched Cinquefoil growing from six inches to three feet high. The leaves are divided into five to seven narrow leaflets, with a smooth but usually rolled edge; they are lighter below but not wooly as in the last species. The stem is quite erect, brownish and with bark often peeling off in shreds. The yellow flowers may be solitary, but usually are in rather flat-topped clusters. This species is common everywhere.
B. Purple Cinquefoil; Marsh Five-finger.
Marsh Five-Finger; Purple Cinquefoil (Potentilla palustris) is in character quite like the foregoing species. It is the only one, however, having purple flowers, and is easily recognized on that account. The flowers are nearly an inch broad, larger than those of the other Cinquefoils; they have a large calyx, the divisions of which are longer than the petals; the petals are also pointed, whereas those of the other species are rounded or else wedge-shaped.
The stem grows from 6 to 20 inches long and is rather woody at the base. The leaves alternate along the stem, as is customary with all members of the Rose family; they are divided into five or seven, spatulate-shaped, toothed leaflets. Purple Cin-quefoil grows in swamps or cool bogs, from Labrador to Alaska and south to N. J., Pa., la., and Cal., flowering during July and August.