Woodland Star

Woodland Star © DSchiel

San Francisco Woodland Star, Common Woodland Star
Lithophragma affine
NATIVE

Description (Jepson, PlantID.net)

    • Eudicotyledon
      • Eudicots are a major lineage of flowering plants; see family for general characteristics
    • Saxifrage Family (Saxifragaceae)
    • Perennial herb from rhizomes (horizontal underground stems)
    • Leaves
      • Rounded basal leaves with shallow, scalloped lobes, on long stalks (petioles)
      • Any stem leaves are alternate (1 leaf at each junction with stem), with deeper, more-sharply cut lobes
    • Flowers
      • Inflorescence (flower arrangement) is a single, tall, nodding raceme (unbranched stem with stalked flowers opening from the bottom up)
      • Star-shaped flowers with 5 white, unfused petals, each with 3 variably-shaped lobes
      • Floral cup (hypanthium) with a V-shaped base
      • Ovary is partly inferior (attached below other flower parts)
    • Fruit a capsule (a dry, multi-chambered fruit that splits open at maturity) with smooth seeds
    • Height 4-24 in.

    Distribution

      • Native to California
        • Grows in grasslands and woodlands of coast and mountain ranges
        • See Calflora for statewide observations of this plant
      • Outside California, grows from southwest Oregon to Baja California, Mexico
      • Grows at elevations to 6,500 ft.

      Uses (Picking or removing any natural material from public land is illegal)

        • Species in the genus Lithophragma can self-pollinate or be pollinated by various insect species, e.g. solitary bees and bombyliid flies (Thompson 2017)
          • An interesting relationship occurs with the Greya moths, floral parasites that lay their eggs in the flower ovary
            • In the process of laying its eggs, the moth pollinates the flower
            • Hatched larvae eat some, but not all, of the seeds
            • This is an example of mutualism as both moth and plant benefit
        • Native people chewed the roots to treat colds and stomach aches

        Name Derivation

          • Lithophragma (lith-oh-FRAG-ma) – from the Greek lithos, meaning “rock,” and phragma, for “hedge” or “fence,” thus “rock hedge,” referring to the rocky habitats favored by some species
          • affine (a-FY-nee) – from the Latin affinis, “bordering on” or “related” or “similar to”
          Hill Star (L), Woodland Star (R)
          © DSchiel

          ID Tips

            • May be confused with hill star (L. heterophyllum)
              • Hill star’s floral-cup base is squared-off (blunt)
              • Woodland star’s floral-cup base is “V” shaped
            • Mnemonic
              • Hill star’s squared-off base is half of an “H” (Hill), whereas the woodland star’s V-shaped base is half of a “W” (Woodland)

            At Edgewood

              • Found in woodlands
              • Flowers February – May

              See General References

              Specific References

                Prigge, B.A. and Gibson, A.C. 2013. Lithophragma affine. A Naturalist’s Flora of the Santa Monica Mountains and Simi Hills, California. Web version, hosted at Wildflowers of the Santa Monica Mountains National Recreation Area. National Park Service. US Department of Interior.

                  Thompson, J.N., Schwind, C., and Friberg, M. 2017, Aug. Diversification of Trait Combinations in Coevolving Plant and Insect Lineages. The American Naturalist, 190: 2. University of Chicago Press Journals.

                    Thompson, J.N., et al. 2013. Diversification through Multitrait Evolution in a Co-evolving Interaction. Proceedings of the National Academy of Sciences of the United States of America (PNAS), Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California.