Jepson Flora Project: Jepson Interchange    
 

The Jepson Manual: Higher Plants of California

    THIS PAGE IS NO LONGER UPDATED
    AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

Names are linked to treatments from the Manual


Key to GERANIUM

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

  1. Annual (biennial); root slender, short
 
    2. Leaf blade ± compound — leaflets 3, pinnately lobed; petals > 8 mm
G. robertianum
    2' Leaf blade deeply lobed to dissected; petals generally < 7 mm
 
      3. Sepals acute; sepals, petals generally < 4 mm
 
        4. Fruit body transversely wrinkled, glabrous
G. molle
        4' Fruit body smooth, minutely strigose
G. pusillum
      3' Sepals awned, awn 1–2 mm; sepals, petals generally > 4 mm
 
        5. Pedicel 10–30 mm, > flower; fruit beak 3–5 mm
G. bicknellii
        5' Pedicel 2–10 mm, ± = flower; fruit beak 2–3 mm
 
          6. Pedicel hairs stiff, straight to curving downward; fruit hairs ascending, ± 1 mm
G. carolinianum
          6' Pedicel hairs glandular, spreading; fruit hairs spreading, < 1 mm
G. dissectum
  1' Perennial; underground caudex thick, scaly, ± carrot-like
 
    7. Sepals 3–5 mm, petals 4–8 mm; fruit beak < 1 mm
 
      8. Stem, petiole hairs ± spreading or curving downward, petals generally 6–8 mm
G. potentilloides
      8' Stem, petiole hairs appressed, pointing downward; petals generally 4–6 mm
G. retrorsum
    7' Sepals 6–14 mm, petals > 10 mm; fruit beak > 2 mm
 
      9. Leaf blade ± compound; sepal hairs coarse, purplish
G. anemonifolium
      9' Leaf blade deeply lobed to dissected; sepal hairs soft, glandular or not, white
 
        10. Petal surface glabrous, base ciliate; style branches < 3 mm
G. oreganum
        10' Petal surface soft-hairy in lower half; style branches > 3 mm
 
          11. Pedicel hairs tipped with red to purple glands
G. richardsonii
          11' Pedicel hairs tipped with white to yellow glands
 
            12. Petal surface soft-hairy over lower 1/2; style branches 6–9 mm; Sierra Nevada, Southwestern California
G. californicum
            12' Petal surface soft-hairy over lower 1/3–1/5; style branches 4–5 mm; Klamath Ranges, Modoc Plateau
G. viscosissimum


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