PART 6, 1918] ROSACEAE 501 
the young shoots strongly bristly; floral branches 1—2 dm. long, usually armed; stipules adnate, 
about 2 cm. long, glabrous or nearly so, glandular-dentate, the lower narrow, the upper dilated, 
the free portion semi-ovate; petiole and rachis sparingly hairy; leaflets glabrous, 5 or 7, 
mostly 7, dark-green and shining above, paler and lighter green beneath, elliptic or oval, 2—4 
em. long, thin, acute at both ends; serrate with sharp non-glandular teeth; flower in clusters 
of 1-3; pedicels about 2 cm. long, glandular-hispid; hypanthium decidedly pyriform, tapering 
into the pedicels, in fruit light-red, 10-12 mm. thick; sepals lanceolate, caudate-attenuate, 
about 1.5 cm. long, strongly glandular-hispid, usually more or less lobed, with subulate lobes, 
deciduous; petals obcordate, 2—2.5 cm. long; styles distinct, numerous, not exserted, per- 
sistent; achenes inserted mainly in the bottom of the hypanthium. 
Type collected at Coskaty, Nantucket Island, Massachusetts, August 14, 1906, E. P. Bicknell. 
DISTRIBUTION: Islands and coast, Nova Scotia to New York; apparently the same in Tennessee. 
Rosa Bicknellii X nanella. This resembles R. nanella in habit, leaf-form, the small curved 
prickles, and small fruit, but the plant is larger, more bristly on the young shoots and the fruit is 
decidedly elongate. Chappaquiddick Island, Massachusetts, September 24, 1915, E. P. Bicknell. 
Rosa Bicknellii X virginiana. ‘This resembles most R. virginiana in habit, having corymbose 
flowers, but the prickles are smaller and perhaps more curved and the fruit varies from round-elliptic 
eS Senta pyriform, acutish at the base. Squam, Nantucket Island, September 25, 1915, E. P. 
icknell. 
29. Rosa petiolata Rydberg, sp. nov. 
Stem simple, terete, 1-2 m. high, unarmed or with small straight prickles; stipules adnate 
to the petioles, about 2 cm. long, narrow, entire or slightly glandular-dentate, the free portion 
lanceolate; leaflets 7-9, oblanceolate, distinctly petiolulate, acute at the apex; serrate except 
at the cuneate base, glabrous on both sides, paler beneath, 3-6 cm. long; flowers corymbose; 
pedicels 2-5 cm. long, more or less glandular-hispid; hypanthium ellipsoid, tapering at the 
base; glandular-hispid, in fruit 12-14 mm. long, 8-9 mm. wide; sepals glandular-hispid, lanceo- 
late, caudate-acuminate, about 1.5 cm. long; petals unknown; styles included, persistent. 
Type collected in Clark County, Missouri, August 27, 1892, Bush (herb. Mo. Bot. Gard.). 
DISTRIBIUTON: Type locality, and apparently also West Medford, Massachusetts. 
30. Rosa Aucuparia Rydberg, sp. nov. 
Stem tall, 1 m. high or more, green, terete, armed with slender, straight prickles, which 
are 5-10 mm. long; young shoots also rather densely bristly; stipules narrow, adnate, about 
2 cm. long, slightly pubescent, entire, the free portion narrowly lanceolate, acuminate; petiole 
and rachis finely pubescent, and rarely with a few weak prickles; leaflets mostly 9, rarely 7, 
oblong or lance-oblong, sharply serrate, 2-6 cm. long, glabrous or nearly so on both sides, 
dark-green above, only slightly paler beneath; flowers corymbose; pedicels about 2 cm. long, 
sparingly glandular; hypanthium globose, sparingly glandular-hispid, in fruit about 12 mm. 
thick; sepals lanceolate, caudate-attenuate, glandular on the back, tomentose on the margins, 
about 2 cm. long, after anthesis reflexed and deciduous; achenes inserted in the bottom of the 
hypanthium. 
Type collected at Dumal, Missouri, July 6, 1909, Bush 5866 (herb. N. Y. Bot. Gard.). 
31. Rosa nitida Willd. Enum. 544. 1809. 
Rosa blanda Pursh, Fi. Am. Sept. 344, in part. 1814. Not R. blanda Ait. 1789. 
Rosa rubrispina Bosc; Poir. in Lam. Encye. Suppl. 4: 715. 1816. 
? Rosa Redutia rubescens Thory; Redouté, Roses 1: 103. 1817. 
Stem slender, terete, often reddish, 1-6 dm. high, densely bristly and with very slender 
prickles 3-5 mm. long; branches usually also copiously bristly, about 1 dm. long; stipules 
rather broad, especially the upper ones, adnate, 1—2 cm. long, glandular-dentate, glabrous or 
nearly so; petioles and rachis glabrous or nearly so, often somewhat bristly; leaflets usually 
7-9, rather crowded, elliptic or oblong, 1—3 cm. long, acute at both ends or obtuse at the apex, 
glabrous on both sides or slightly pubescent beneath, sharply and finely serrate, shining above; 
flowers solitary or 2 or 3 together, usually with dilated bracts; pedicels 1-3 cm. long, glandular- 
hispid; hypanthium globose, glandular-hispid, in fruit about 1 cm. broad; sepals lanceolate, 
caudate-attenuate, about 1.5 cm. long, glandular-hispid on the back, tomentose within, usually 
