Rosa gymnocarpa |
Rosa nutkana |
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bald-hip rose, dwarf rose, naked-hip rose, wood rose |
bristly rose, Nootka rose, wild rose |
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Habit | Shrubs or subshrubs, usually loosely clustered. | Shrubs, loosely clustered or forming dense thickets. | ||||||||||||
Stems | erect, sometimes spreading, slender, (1–)3–15(–25) dm, sparsely or densely branched; bark sometimes glaucous, reddish brown with age, glabrous; infrastipular prickles 0–2, erect, subulate, 2–8(–10) × 1.5 mm, terete, internodal prickles similar or smaller, sparse to dense, sometimes absent on distal stems, mixed with aciculi, base terete, eglandular. |
erect or spreading, stout or lax, 4–25(–40) dm, densely or openly branched; bark dull reddish brown, older wood with gray exfoliate, glabrous; infrastipular prickles 0–2, erect, curved, or hooked, often flattened, stout, subulate, sometimes deltoid, (2–)3–15(–20) × 2–10(–15) mm, base glabrous, internodal prickles usually sparse or absent, smaller, mixed with aciculi, sometimes absent. |
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Leaves | (2–)4–10(–17) cm; stipules 5–15 × 2–5 mm, auricles flared, 2–3 mm, margins entire, stipitate-glandular, surfaces glabrous, eglandular; petiole and rachis with pricklets, glabrous, rarely finely puberulent, sparsely stipitate-glandular; leaflets 5–9(–11), terminal: petiolule (2–)5–12(–20) mm, blade elliptic to obovate or ovate to nearly orbiculate, (4–)10–40(–60) × (4–)10–20(–40) mm, membranous to ± leathery, margins 2+-serrate, teeth 7–13 per side, obtuse to acute, gland-tipped, apex obtuse, sometimes nearly acute, rounded, or truncate, abaxial surfaces pale green, glabrous, eglandular, adaxial green, dull, glabrous. |
(3–)5–12(–17) cm; stipules 12–20(–28) × 3–5(–10) mm, auricles flared, 3–6(–10) mm, margins sinuate or shallowly serrate, sparsely to ± densely stipitate-glandular, surfaces glabrous, rarely pubescent, eglandular; petiole and rachis with pricklets absent or sparse, glabrous or pubescent, sessile- or stipitate-glandular; leaflets 5–7(–9), terminal: petiolule (3–)5–17 mm, blade ovate, elliptic, or suborbiculate, rarely cordate or oblong, (14–)20–55(–63) × (6–)10–30(–40) mm, firm, base cuneate to obtuse, margins 1–2+-serrate, teeth 8–20 per side, often broad-based 2–4 mm, acute to obtuse, eglandular or gland-tipped, apex acute or obtuse, rarely acuminate, abaxial surfaces green, glabrous or sparsely pubescent, eglandular or sessile-glandular, adaxial green, dull, glabrous. |
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Inflorescences | corymbs, usually 1–3-flowered, rarely in multi-flowered candelabras. |
corymbs, 1–3(–9)-flowered. |
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Pedicels | erect, ± curved as hips mature, slender, 10–25(–35) mm, glabrous, stipitate-glandular, rarely eglandular (except var. serpentina); bracts some early caducous, 1 or 2, attached near pedicel bases, ovate or lanceolate, 4–12 × 2–8 mm, margins entire, short stipitate-glandular, apex acute or rounded, surfaces glabrous, eglandular. |
erect or recurved, slender to stout, 10–20(–33) mm, glabrous, eglandular or sparsely stipitate-glandular; bracts 1 or 2(or 3), ovate, 13–20 × 4–9 mm, margins entire, surfaces glabrous, glandular or eglandular. |
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Flowers | 1.5–3 cm diam.; hypanthium narrowly ovoid-urceolate, 2–4 × 1.5–2 mm, glabrous, eglandular, neck 0–1 × 1.5 mm; sepals ascending to reflexed, lanceolate, 5–10 × 2–3 mm, tip 0.1–5 × 1 mm, margins entire, abaxial surfaces glabrous, eglandular, sometimes stipitate-glandular; petals single, deep pink, 8–15 × 6–13 mm; stamens 57; carpels 3–12(–16), styles exsert 1–1.5 mm beyond stylar orifice (1 mm diam.) of hypanthial disc (2–4 mm diam.). |
(3.5–)4.5–7(–8.5) cm diam.; hypanthium globose to subglobose or ovoid, 4–10 × 5–8.5 mm, glabrous, eglandular, sometimes setose-glandular, neck (0–)0.5–1.5 × 3–6 mm; sepals spreading, lanceolate, 14–25(–35) × (2–)3–4 mm, tip 5–10(–20) × 1–3 mm, margins entire, abaxial surfaces glabrous or slightly hairy, stipitate-glandular and sessile-glandular or eglandular; petals single, pink to deep rose, (15–)20–32 × (15–)20–32 mm; stamens 100; carpels 28–58, styles exsert 1 mm beyond stylar orifice (2–2.5 mm diam.) of hypanthial disc (5 mm diam.). |
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Hips | scarlet, irregularly ellipsoid or ellipsoid to nearly globose, 7–15 × 5–13 mm, fleshy, glabrous, eglandular, neck 0–2 × 1.5–2.5 mm; sepals, styles, and distal receptacle collectively deciduous at fruit maturity along well-defined, circumscissile line, erect to reflexed. |
red, orange-red, or purplish red, globose, depressed-globose, ovoid, oblong, or urceolate, (8–)10–20(–24) × 10–20(+) mm, fleshy, glabrous, sometimes setose, eglandular or glandular, neck (0–)1–2 × (4–)5–8 mm; sepals persistent, erect, sometimes spreading. |
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Achenes | basiparietal, (1–)4–10(–12), cream to pale brown, (3–)4.5–7 × 2–4 mm. |
basiparietal, (1–)16–40, tan to dark tan, 4–6 × 2–4 mm. |
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Rosa gymnocarpa |
Rosa nutkana |
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Distribution |
CA; ID; MT; OR; WA; BC
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AK; AZ; CA; CO; ID; MT; NM; OR; UT; WA; WY; BC
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Discussion | Varieties 2 (2 in the flora). Rosa gymnocarpa is most easily distinguished in mature fruit, in that the sepals collectively and cleanly separate from the hip together with styles and, sometimes, associated hypanthia. Other diagnostic features include solitary to few, small flowers, stipitate-glandular pedicels, hypanthia extremely small in bud, and glabrous leaflets doubly glandular-toothed. The species is also one of the relatively few roses that flourishes in partial shade. Rosa gymnocarpa occurs in forested areas from British Columbia and Montana to central California, with disjunct populations in southern California; it skirts the Great Basin, with the possible exception of the type of R. leucopsis Greene, a likely synonym, purportedly from central Oregon’s sagebrush steppe, which is otherwise devoid of the species (A. Cronquist and N. H. Holmgren 1997). The distinctive features of Rosa gymnocarpa have been used as the basis for sect. Gymnocarpae Crépin. Recognition of that section is not supported by the molecular analysis by A. Bruneau et al. (2007), in which R. gymnocarpa occurs in a clade with R. pinetorum and one sample of R. californica, separate from a distinct clade that groups diverse specimens of R. bridgesii, R. spithamea, and some Asian species of sect. Rosa. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies 3 (3 in the flora). Rosa nutkana is a widespread, polymorphic, hexaploid species that occurs from coastal Alaska to northern California, and eastward in the Rocky Mountains from Montana to New Mexico (W. H. Lewis and B. Ertter 2007). Flowers and hips are usually solitary and significantly larger than in most sympatric species, and sepal tips are usually conspicuously prolonged and expanded. Eglandular and stipitate-glandular or setose hips can occur in the same population. A presumed hybrid between subsp. nutkana (6x) and Rosa rugosa (2x) has been reported from Washington state. In Colorado, at the southeasternmost range of R. nutkana, a putative hybrid between subsp. melina and R. acicularis subsp. sayi has been recognized as R. ×engelmannii S. Watson. It is based on such intermediate characteristics as few infrastipular prickles with interspersed aciculi on distal stems and fertile branches, sparsely stipitate-glandular abaxial sepal surfaces, petioles and rachises with few pricklets, and blade margins 1- or multi-serrate. Among the Lillooet and Thompson tribes of southwestern British Columbia, Rosa nutkana is considered of high value for use in traditional medicine (N. J. Turner 1988). They do not distinguish R. acicularis and R. woodsii from R. nutkana and use them similarly; R. gymnocarpa is distinct in name and use. Root extracts of R. nutkana, probably subsp. nutkana, were found to be active against an enteric coronavirus in antiviral screening (A. R. McCutcheon et al. 1995). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 116. | FNA vol. 9, p. 112. | ||||||||||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Roseae > Rosa > subg. Rosa > sect. Rosa | Rosaceae > subfam. Rosoideae > tribe Roseae > Rosa > subg. Rosa > sect. Rosa | ||||||||||||
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Name authority | Nuttall: in J. Torrey and A. Gray, Fl. N. Amer. 1: 461. (1840) | C. Presl: Abh. Königl. Böhm. Ges. Wiss., ser. 5, 6: 563. (1851) | ||||||||||||
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