Upland Dewberry

Rubus invisus (L. H. Bailey) Britton, Mem
Torrey Club 4 : 115. 1893.
Rubus canadensis invisus L. H. Bailey, Am. Gard. 12: 83. 1891.
Stems biennial, decumbent, sometimes ascending, sparingly armed with weak straight prickles, glabrous, terete; leaves of the turions pedately 5-foliolate; stipules subulate, 1-1.5 cm. long; petioles, petiolules, and midveins sparingly armed with weak, retrorse prickles, glabrous or essentially so; leaves thin, light-green, sparingly pubescent on both sides or glabrous, coarsely and rather evenly serrate, with broad triangular teeth, abruptly short-acuminate at the apex; median leaflet rounded-ovate, rounded or subcordate at the base, 6-10 cm. long, 5-8 cm. wide; petiolule 1-2.5 cm. long; lateral leaflet ovate, rounded or acute at the base, the outermost 4r-6 cm. long, subsessile; floral branches 1.5-2.5 dm. long; leaves 3-foliolate or the upper 1-f oliolate; petioles 2-6 cm. long, often unarmed; leaflets ovate or oval, acute, 3-6 cm. long; petiolule of the median leaflet about 1 cm. long, those of the lateral ones very short or none; flowers solitary in the upper axils and at the ends, or 2 or 3 together at the ends of the branches; peduncles or pedicels villous and more or less glandular-hispid; sepals 6-10 mm. long, villous without, tomentose within, ovate, acuminate, often with foliaceous tips; petals elliptic, 1-1.5 cm. long, white; fruit hemispheric, 15-20 mm. in diameter; drupelets large,
glabrous.
Type locality: Ithaca, New York.
Distribution: Connecticut to Ontario, Virginia, and North Carolina.

Rubus invisus is a species of dewberry, known as upland dewberry. Like other dewberries, it is a species of flowering plant in the rose family, related to the blackberry. It is found in the eastern and east-central United States.