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Rosa rugosa

Rosa -

by Gerry Moore
Not peer reviewed
Last modified: 09/08/2006

Nomenclature

Rosa L., Sp. Pl. 491. 1753. Gen. Pl., ed. 5, 217. 1754. LECTOTYPE: Rosa centifolia L., designated by Britton & Brown (1913), Rosa cinnamomea L., Britton & Wilson (1923), or Rosa canina L., Rehder (1949).

Key to the species of Rosa

1. Styles united into a column, protruding from the orifice of the hypanthium; stems climbing or trailing...2
1. Styles distinct, only slightly if at all exserted, usually only the stigma is exserted; erect to arching, usually colonial shrubs...4

2. Flowers pink; leaflets 3 or 5; stipules entire or nearly so...Rosa setigera
2. Flowers white; leaflets 7 or 9...3

3. Stipules pectinate and glandular-toothed...Rosa multiflora
3. Stipules dentate...Rosa wichuriana

4. Outer sepals pinnatifid or at least with narrow lateral lobes...5
4. Outer sepals entire...7

5. Lower leaf surfaces glabrous or nearly so; leaf teeth glandless...Rosa canina
5. Lower leaf surfaces glandular; leaf teeth glandular...6

6. Styles pubescent; sepals erect and persistant in fruit...Rosa eglanteria
6. Styles glabrous; sepals soon deciduous...Rosa micrantha

7. Leaflets rugose, densely soft-pubescent beneath; young branches, thorns, leaf rachises, and pedicels densely pubescent...Rosa rugosa
7. Leaflets not rugose, glabrous, or slightly pubescent beneath; young branches, thorns, and often other parts glabrous or stipitate-glandular...8

8. Infrastipular thorns strong and slightly curved toward the base of the plant; internodal thorns or prickles absent or occasional at base of plant...11
8. Infrastipular thorns absent or straight; internodal spines often of similar shape and size...9

9. Sepals persistent and connivent as a beak on fruit; flowers borne on lateral branches from stems of previous year; prickles absent or confined to base...Rosa blanda
9. Sepals deciduous in fruit; flowers borne on current year’s stems; prickles found throughout the stem...10

10. Stems with hundreds or thousands of prickles; stipules herbaceous, expanded above...Rosa nitida
10. Stems with few prickles; stipules fine, linear...Rosa carolina

11. Pedicels and hypanthia smooth, glabrous; sepals erect on the mature fruit...12
11. Pedicels and hypanthia glandular-hispid; sepals widely spreading on mature fruit...13

12. Flowers double...Rosa majalis
12. Flowers single...Rosa cinnamomea

13. Leaves finely serrate; stipules firm, linear, or with parallel sides...Rosa palustris
13. Leaves coarsely serrate; stipules herbaceous, dilated toward the apex...Rosa virginiana

List of Rosa Species

References

References to Rosa

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