The Jepson Manual: Higher Plants of California

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Names are linked to treatments from the Manual


Key to ROSA

N.B.: couplets are linked, e.g., 1. is linked to 1'.

  1. Leaflets << 1 cm, toothed 1/2 to base; hypanthium densely prickly — rare Peninsular Ranges
R. minutifolia
  1' Leaflets > 1 cm, toothed < 1/4 to base; hypanthium glabrous to stalked-glandular
 
    2. Sepal with toothed lateral lobes; stem generally ± olive-green; prickles compressed side-to-side, curved; alien
 
      3. Leaves and sepals glandless; terminal leaflet ± ovate
R. canina
      3' Leaves and sepals glandular; terminal leaflet generally elliptic to ± widely obovate
R. eglanteria
    2' Sepal body generally entire (tip sometimes toothed); stem generally ± grayish or brownish; prickles compressed or slender, not curved (except R. californica); native
 
      4. Sepals deciduous in fruit; hypanthium generally 2–3 mm wide at flowering; pistils < 10; sepal tip generally << body; petals ± 10 mm — leaflets glabrous, flowers 1–3
R. gymnocarpa
      4' Sepals persistent; hypanthium generally 3–7 mm wide at flowering; pistils generally > 10 (except some R. bridgesii); sepal tip often > body; petals generally 10–25 mm
 
        5. Dwarf ± rhizomatous shrubs generally 1–10 dm; leaflet tip often ± truncate — leaf margins generally ± glandular, double-toothed
 
          6. Hypanthium stalked-glandular — prickles generally ± slender, often many; flowers generally 2–5; Northwestern California, Central Western California, 150–1550 m
R. spithamea
          6' Hypanthium generally glabrous
 
            7. Prickles few, base thick; terminal leaflet generally widely obovate; flower 1(–5); Cascade Range, Sierra Nevada, 900–2500 m
R. bridgesii
            7' Prickles generally many, both slender and base thick; terminal leaflet generally ± elliptic; flowers generally 1–5; Central Western California, generally < 300 m
R. pinetorum
        5' Open or thicket-forming shrubs generally > 5 dm; leaflet tip not truncate
 
          8. Prickles generally ± slender, ± straight, few–many; leaves and sepals glandless; flowers 1–5(10); Cascade Range, High Sierra Nevada, San Gabriel Mountains, San Bernardino Mountains, Great Basin Floristic Province, Desert Mountains
R. woodsii var. ultramontana
          8' Prickles generally ± thick-based, often curved, generally ± few (except R. nutkana); leaves and sepals often glandular; flowers often > 5; California Floristic Province (except High Sierra Nevada)
 
            9. Prickles generally curved, not contrasting with stem; sepals often glandless, tip generally ± = body; pedicel generally ± hairy
R. californica
            9' Prickles ± straight, generally whitish, contrasting with dark stem; sepals generally ± glandular, tip generally > body; pedicel glabrous to glandular, generally not hairy
 
              10. Flower generally 1(–4); sepal tip generally toothed; leaf ± glandular; hypanthium generally 5–7 mm wide at flowering; pedicel sometimes glandular; petals generally 18–25 mm; w Northwestern California; < 700 m
R. nutkana var. nutkana
              10' Flowers generally 2–10; sepal tip entire; leaf glandless; hypanthium generally 3–6 mm wide at flowering; pedicel generally glabrous; petals ± 15–20 mm; Northwestern California, Cascade Range; < 2100 m
R. pisocarpa


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