PART 6, 1918] ROSACEAE 483 
usually serrate Jeaflets or leaves. Flowers perfect, solitary or corymbose. 
Hypanthium well-developed, urceolate, globose, ellipsoid, or turbinate, con- 
tracted at the mouth, enclosing the achenes, becoming fleshy in fruit. Sepals 
5, rarely 4, with or without bractlets. Petals normally 5, rarely 4, or by the 
transformation of the stamens numerous, spreading, usually obcordate. Sta- 
mens numerous, inserted on the thickened margin of the hypanthium. Pistils 
numerous or several, inserted in bottom of the hypanthium or also on the 
inside walls of the same. Styles ventral, reaching the mouth of the hypan- 
thium or long-exserted, sometimes united into a column; stigmas thickened. 
Achenes bony; radicle superior. 
b7 ROSA(lLourn:) 1: Sp. Pl49h. 1753. 
Rhodophora Neck. Elem. 2:91. 1790. 
Leaves pinnate, with stipules; otherwise see characters of the tribe. 
Type species, Rosa cinnamomea L,. 
Styles much exserted, about equaling the stamens; stipules adnate; sepals 
reflexed, deciduous. 
Styles united; stem climbing, with curved prickles. I. SYNSTYLAE. 
Styles free; stem erect. II. INDICAE. 
Styles not exserted, or only slightly so: stigmas forming a head closing 
the mouth of the hypanthium. 
Stipules almost free from the petioles; introduced climbers or trailers. 
Leaflets 3-5; branches glabrous; stipules small, entire. III. LAEVIGATAE. 
Leaflets 7-9; branches tomentose or pubescent; stipules pectinate. IV. BRACTEATAE. 
Stipules for most of their length adnate to the petioles; plants rarely 
climbing. 
Pistils numerous; styles as well as the upper part of the hypan- 
thium persistent. 
Sepals after flowering reflexed and soon deciduous. 
Achenes inserted both on the inner walls and in the bottom 
of the hypanthium; prickles rarely infrastipular. 
Leaflets 3-5, rarely 7, large, round; stem with both 
scattered prickles and bristles; flowers mostly solitary. V. GALLICAE. 
Leaflets mostly 7; stem with strong prickles, very rarely 
with bristles. VI. CANINAE. 
Achenes inserted only in the bottom of the usually bristly 
hypanthium; stem with infrastipular prickles and usually 
with numerous bristles on the young shoots. VII. CaROLINAE. 
Sepals after flowering erect, connivent, long persistent on the 
fruit. 
Flowers corymbose, or if solitary, then supported by a 
bract and the leaflets large; achenes inserted both 
on the inner walls and in the bottom of the hypan- 
thium. 
Stem with scattered prickles, rarely with intermixed 
bristles; sepals more or less lobed; foliage glandular- 
punctate, sweet-scented. (R. rubiginosa and R. 
tomentosa in VI. CANINAE. 
Stem, at least the young shoots, bristly; prickles in- 
frastipular or lacking; sepals entire or the outer 
sometimes with one or two lobes; foliage not very 
sweet-scented. VIII. CINNAMOMEAE. 
Flowers solitary, bractless; leaflets very small. 
Leaflets 7-11; achenes inserted both on the inner walls 
and in the bottom of the hypanthium. IX. PIMPINELLIFOLIAE. 
Leaflets 3-7; achenes inserted only in the bottom of 
the hypanthium. X. MINUTIFOLIAE. 
Pistils few; styles deciduous with the upper part of the hypan- 
thium, which falls off like a ring. XI. GyMNOCARPAE. 
I. SYNSTYLAE 
Stipules pectinate. 1. R. multiflora. 
Stipules entire or denticulate. 
Leaflets of flowering branches 5-7; petals white. 
Sepals narrowly lanceolate, gradually acuminate, about 2 cm. long. 2. R. moschata. 
Sepals ovate-lanceolate, short-acuminate, about 1 cm. long. 3. R. sempervirens. 
Leaflets of the floral branches 3, rarely 5; petals rose-colored. 
Leaflets glabrous or slightly pubescent on the veins beneath, dark- 
green and shining above. 4. R. setigera. 
Leaflets velutinous-pubescent beneath, rather dull above. 5. R. rubifolia. 
