ROSACE A E. 497 



14. Rubus ostryifdlius Rydb. Coast Blackberry. Ascending or de- 

 pressed. 6-12 dm. high. Stems brownish purple; prickles stout, broad, flat at the 

 base, recurved; younger parts finely villous; leaves 3-foliolate; leaflets oblong or 

 oblong-ovate, rather simply serrate, finely villous below, slightly pubescent or 

 glabrate above ; corymb small, 1-5 -flowered, villous-pubescent and somewhat 

 prickly; flowers 1-2 cm. in diameter; sepals ovate, with a short subulate tip; 

 fruit hemispherical, black, rather dry. less than 1 cm. high. Near the seashore 

 from X. J. to N. Car. Type from Atlantic Highlands, N. J. May-Aug. In habit 

 intermediate between a blackberry and a dewberry. 



15. Rubus frondosus Bigel. Leafy-bracted Blackberry. Erect, about 

 1 m. high, decidedly villous, especially when young. Stems stout, angled, with 

 rather stout, straight prickles; leaves mostly 3-foliolate, especially on the flowering 

 branches, leaflets short-obovate, doubly and sharply serrate; terminal one generally 

 short-petioled; inflorescence dense, generally leafy-bracted and subtended by 

 unifoliolate leaves ; flowers about 3 cm. broad; petals broadly obovate. N. Eng. 

 to Ohio and Va. [A\ villosus var. frondosus Torr.] 



16. Rubus Randii (Bailey) Rydb. Rand's Blackberry. Low and diffuse, 

 almost glabrous, 3-5 dm. high, with very few and weak prickles, not rarely un- 

 armed and only slightly shrubby. Leaves very thin, those of the sterile shoots 

 5-loliolate. those of the flowering stems mostly 3-foliolate, ovate or lance-ovate, long- 

 acuminate, sharply and doubly serrate, the terminal one slender-petioled; in- 

 florescence elongated, many-flowered, bristly but not glandular; flowers 15-25 mm. 

 broad; fruit hemispheric, small, less than I cm. long. Me. to Lake Superior and 

 Va. June-Aug. [R. villosus var. Randii Bailey.] 



17. Rubus argutus Link. Tall Blackberry. Resembling the last, but 

 stems tall. 1-2 m. high, stout, angled, purple, with strong and slightly recurved 

 prickles; inflorescence corymbose, many-flowered, short; leaves of the flowering 

 branches often small and the uppermost unifoliolate; flowers 2-3 cm. broad; petals 

 oval or narrowly obovate; fruit hemispheric, alout 1 cm. high. It has been 

 confused with R. frondosus. but is glabrate, its sterile shoots have larger, long- 

 acuminate leaflets, and the petals are narrower. Prince Edward Island to Ga., 

 Ala. and Penn. May-July. 



18. Rubus Canadensis L. Millsfaugh's Blackberry. (I. F. f. 1900.) 

 Ascending, wand-like, entirely unarmed, or with a few weak prickles, glabrous or 

 the younger shoots scurfy-pubescent; stems 15-35 dm. long. Leaves long-petioled, 

 pedately 5-foliolate. or some 3-foliolate; leaflets oval, thin, glabrous on both sides, 

 long-acuminate or acute, rounded or narrowed at the base, often 15 cm. long and 

 5 cm. wide, sharply but not very deeply serrate; stalk of the terminal leaflet 4-10 

 cm. long; inflorescence loosely racemose; pedicels slender, ascending; fruit black, 

 very pulpy. 15-25 mm. long. In thickets and rich woods, mountains of N. Eng., 

 the Adirondacks, and in the higher southern Alleghanies. June-Aug. \JR.Mills- 

 paughii Britt.] 



19. Rubus rubrisetus Rydb. Red-bristled Dewberry. Stems 6-12 dm. 

 long, trailing, weakly prickly and densely clothed with red or purplish bristles. 

 Leaves 5-foliolate. or some of the flowering branches 3-foliolate, thick, evergreen, 

 glabrous and shining; leaflets all petiolate, obovate or oval, acute or acuminate, 

 dentate with broad teeth ; inflorescence corymbose. 3-7-flowered, prickly and 

 bristly; flowers 15-25 mm. wide; sepals ovate, with a short subulate tip. In 

 the Mississippi Valley from Mo. to La. Feb. -June. Type from New Orleans. 



20. Rubus trivialis Michx. Southern Dewberry. (I. F. f. 1904.) Stem 

 trailing or procumbent. I m. long or more, beset with stout hooked prickles, and 

 sometimes slightly bristly. Branches erect. 3-15 cm. high, prickly; leaves petioled, 

 3-foliolate (rarely 5-foliolate); leaflets oval or sometimes ovate lanceolate, coriaceous, 

 evergreen, glabrous or very nearly so, acute or obtusish at the apex, serrate- 

 dentate; peduncles terminal, prickly, 1-3 flowered; flowers often 25 mm. broad, 

 white; petals much exceeding the reflexed sepals; fruit black, often 25 mm. long. 

 well flavored. In dry sandy soil. Va. to Fla.. west to Tex. March-May. 



21. Rubus invisus Bailey. Ithaca Dewberry. Stems stout and partly 

 ascending, terete, armed with straight, slightly reflexed prickles. Leaves of the 

 sterile shoots 5-foliolate, those of the flowering shoots generally 3-foliolate. glabrous 

 or nearly so; leaflets broadly ovate, more or less acuminate, especially tl.< 



