Rosa pisocarpa |
Rosa pisocarpa subsp. ahartii |
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cluster rose, cluster wild rose, peafruit rose, swamp rose |
Ahart rose, Ahart's cluster rose, Ahart's rose |
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Habit | Shrubs, loosely clustered or in dense thickets. | Plants rarely forming thickets. | ||||
Stems | ascending to erect, (2–)4–20(–25) dm, openly branched; bark ± glaucous when young, dark reddish brown or dull red with age outer layer may exfoliate as thin ash gray peel, glabrous; infrastipular prickles usually paired, erect, rarely curved, usually subulate, 2–10 × 2–4 mm, base glabrous, internodal prickles rare or absent. |
usually solitary or loosely clustered, (2–)4–14(–18) dm; infrastipular prickles 0 or 1(or 2), 2–5 mm. |
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Leaves | 5–10(–13) cm; stipules 8–22 × 2–5 mm, auricles flared, 2–5 mm, margins usually entire, sometimes erose or lobed, finely ciliolate to ciliate, eglandular, surfaces glabrous or sparsely pubescent, sparsely stipitate-glandular or eglandular; petiole and rachis sometimes with pricklets, glabrous or hairy hairs to 1 mm, sometimes stipitate-glandular; leaflets 5–7(–9), terminal: petiolule 8–12 mm, blade elliptic-ovate, (15–)20–45(–60) × 9–16(–20) mm, widest at or below middle, membranous, base cuneate to obtuse, margins 1(–2)-serrate, teeth 12–22 per side, on distal 3/4–4/5 of margin, acute, eglandular, apex acute, sometimes obtuse, abaxial surfaces pale green, usually sparsely pubescent, eglandular, adaxial green, dull, glabrous, rarely puberulent. |
(5–)6–11(–13) cm; leaflets 5–7, most commonly 5, terminal blade 20–45(–60) mm. |
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Inflorescences | corymbs, sometimes panicles or solitary flowers, 1–12-flowered. |
1–3(–10+)-flowered. |
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Pedicels | erect, sometimes recurved, slender, 10–22 mm, usually glabrous, sometimes finely puberulent, eglandular, rarely stipulate-glandular; bracts 2–3, lanceolate, 8–14 × 3–6 mm, margins entire, sometimes serrate, irregularly stipitate-glandular and/or erose, surfaces glabrous or pubescent, eglandular. |
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Flowers | 2.4–3.8 cm diam.; hypanthium ovoid-urceolate, 3–5 × 2.5–3.5 mm, glabrous, rarely setose, eglandular, neck (0–)0.5–1 × 2 mm; sepals spreading, ovate-lanceolate, 10–17 × 1.5–3 mm, tip 3–7(–10) × 1.5–2.5 mm, margins entire, abaxial surfaces sometimes puberulent, densely or sparsely stipitate-glandular, rarely eglandular; petals single, pink to deep pink, 12–18 × 10–18 mm; stamens 75; carpels 22–35, styles exsert 1–2 mm beyond stylar orifice (1 mm diam.) of hypanthial disc (3.5 mm diam.). |
sepal tip to 7 mm, abaxial surfaces usually eglandular, rarely stipitate-glandular; carpels 32–34. |
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Hips | scarlet, globose, sometimes subglobose or ovoid, 7–15 × 7–13 mm, fleshy, glabrous, eglandular, rarely setose- or stipitate-glandular, neck (0–)1–1.5 × 1.5–3.5 mm; sepals persistent, erect. |
subglobose to ovoid, 8–13 mm diam., gradually to abruptly narrowed to neck 2.5–3.5 mm diam. |
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Achenes | basiparietal, 5–35, tan, 3–4 × 1.5–2.5 mm. |
5–20. |
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2n | = 14, 28. |
= 28. |
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Rosa pisocarpa |
Rosa pisocarpa subsp. ahartii |
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Phenology | Flowering Jun–Aug. | |||||
Habitat | Streamsides, meadow margins, roadsides in woodlands, seasonally moist areas in openings of midmontane forests | |||||
Elevation | 100–1700 m (300–5600 ft) | |||||
Distribution |
CA; OR; WA; BC
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CA; OR |
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Discussion | Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Subspecies ahartii comprises populations from the northern Sierra Nevada and southern Cascade Range (B. Ertter and W. H. Lewis 2008). Stems tend to have relatively few (or no) prickles, relatively large ovate leaves, and relatively few flowers. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 9, p. 109. | FNA vol. 9, p. 110. | ||||
Parent taxa | Rosaceae > subfam. Rosoideae > tribe Roseae > Rosa > subg. Rosa > sect. Rosa | Rosaceae > subfam. Rosoideae > tribe Roseae > Rosa > subg. Rosa > sect. Rosa > Rosa pisocarpa | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 8: 382. (1872) | Ertter & W. H. Lewis: Madroño 55: 171, fig. 1. (2008) | ||||
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