Biology:Trillium chloropetalum

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Short description: Species of flowering plant

Trillium chloropetalum
TrilliumChloropetalumRubrum-thumb.jpg

Apparently Secure (NatureServe)[1]
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Order: Liliales
Family: Melanthiaceae
Genus: Trillium
Species:
T. chloropetalum
Binomial name
Trillium chloropetalum
(Torr.) Howell
Synonyms[2][3]

Trillium chloropetalum, also known as giant trillium,[4] giant wakerobin,[5] or common trillium,[6] is a species of flowering plant in the family Melanthiaceae. It is endemic to the western U.S. state of California , being especially frequent in and around the San Francisco Bay Area.

Description

Trillium chloropetalum is a perennial, clump-forming herbaceous plant with a thick underground rhizome. Like all trilliums, it has a whorl of three bracts (leaves) and a single trimerous flower with 3 sepals, 3 petals, two whorls of 3 stamens each, and 3 carpels fused into a single ovary with 3 stigmas.[7] Since its flower has no stalk, T. chloropetalum belongs to subgenus Sessilia, the sessile-flowered trilliums. It is one of the largest of all Trillium species, with a scape (stem) from 20 to 70 cm (7.9 to 27.6 in) long. The bracts are broadly ovate, 7 to 21 cm (2.8 to 8.3 in) long and 7 to 18 cm (2.8 to 7.1 in) wide, usually with brownish mottling but sometimes unmottled. Petal color is highly variable, typically ranging from pale greenish yellow to greenish bronze (or purplish green) to dark purple. A variety that lacks yellow pigments has petal colors ranging from white to reddish-purple. The flower petals enclose purple stamens, 15 to 30 mm (0.59 to 1.18 in) long, and a purple ovary. Flowering occurs from late February to early April.[4][8][9]

In the San Francisco Bay Area, a white-petaled form of T. chloropetalum is often confused with T. albidum, which also has white petals. The former is distinguished by the purple pigment in its anther connective tissue, a character lacking in T. albidum.[10]

Taxonomy

In 1856, John Torrey described Trillium sessile var. chloropetalum based on a specimen collected by John Milton Bigelow two years earlier in the "redwoods" of California.[11][12] At the time, Bigelow was exploring the valleys and tributaries of the Sacramento and San Joaquin rivers, but the precise original location of his specimen remains unknown. In 1903, Thomas Jefferson Howell described the species Trillium chloropetalum based on Torrey's variety.[13][14] The epithet chloropetalum means "green-petaled".[15]:105

In 1975, John Daniel Freeman published an influential revision of subgenus Sessilia that included the description of a new species Trillium albidum J.D.Freeman and a completely new circumscription of Trillium chloropetalum (Torr.) Howell.[16] By separating out white-flowered T. albidum, Freeman was able to provide a rational circumscription of T. chloropetalum that includes the following taxa:

  • Trillium chloropetalum var. chloropetalum
  • Trillium chloropetalum var. giganteum (Hook. & Arn.) Munz

The petals of T. chloropetalum var. chloropetalum always show yellow pigments but these are often masked by purple or other pigments.[17] In contrast, the petals of T. chloropetalum var. giganteum lack yellow pigments altogether.[18] The former is characterized by the green-petaled form described by Torrey while the latter includes a white-flowered form of T. chloropetalum distinguished from T. albidum by the presence of dark purple stamens and carpels.

Freeman's treatment of Trillium chloropetalum is widely (if not universally) accepted.[19][4][2][5] Some authorities consider Trillium chloropetalum var. giganteum to be a synonym for Trillium chloropetalum, but even those authorities cite Freeman.[8]

Distribution and habitat

Trillium chloropetalum is endemic to California . Some authorities claim the species ranges across ten California counties, from Monterey County on the central California coast to Lake County in the north central part of the state:[4][9]

  • Alameda, Contra Costa, Lake, Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz, Sonoma

Other authorities claim that T. chloropetalum has a broader range that extends northward to Siskiyou County or southward to Santa Barbara County.[6][8][20]

T. chloropetalum is found at the edges of redwood forests and chaparral, usually on moist slopes, canyon banks, and alluvial soils.[9]

Uses

The variety Trillium chloropetalum var. giganteum, with its deep maroon flower petals, gained the Award of Garden Merit (AGM) from the Royal Horticultural Society in 1993.[21][22]

Gallery

  • Trillium chloropetalum variety chloropetalum with yellowish-green petals observed on March 17 in Marin County, California

    Variety chloropetalum with yellowish-green petals (March 17 in Marin County, CA)

  • Trillium chloropetalum variety giganteum with white petals observed on March 6 in San Mateo County, California

    Variety giganteum with white petals and reddish-purple anther connective tissue (March 6 in San Mateo County, CA)

  • Trillium chloropetalum with pinkish petals observed on March 20 in San Mateo County, California

    With pinkish petals (March 20 in San Mateo County, California)

See also

  • Pacific Railroad Surveys

Bibliography

References

  1. ↑ "Trillium chloropetalum". NatureServe Explorer. NatureServe. https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.152407/Trillium_chloropetalum. 
  2. ↑ 2.0 2.1 "Trillium chloropetalum (Torr.) Howell". Royal Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:542529-1. 
  3. ↑ "Trillium chloropetalum var. giganteum (Hook. & Arn.) Munz". Royal Botanic Gardens, Kew. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:258302-2. 
  4. ↑ 4.0 4.1 4.2 4.3 Case Jr., Frederick W. (2002), "Trillium chloropetalum", in Flora of North America Editorial Committee, Flora of North America North of Mexico (FNA), 26, New York and Oxford, http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242101986, retrieved 7 March 2022 
  5. ↑ 5.0 5.1 "Trillium chloropetalum". Natural Resources Conservation Service PLANTS Database. USDA. https://plants.usda.gov/core/profile?symbol=TRCH2. 
  6. ↑ 6.0 6.1 "Trillium chloropetalum", Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria, Berkeley, California: The Calflora Database, https://www.calflora.org/cgi-bin/species_query.cgi?where-taxon=%27%27Trillium+chloropetalum%27%27 
  7. ↑ Case Jr., Frederick W. (2002), "Trillium", in Flora of North America Editorial Committee, Flora of North America North of Mexico (FNA), 26, New York and Oxford, http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=133668, retrieved 29 March 2023 
  8. ↑ 8.0 8.1 8.2 McNeal, Dale W.; Ness, Bryan D. (2012). "Trillium chloropetalum". The Jepson Herbarium. https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=47218. 
  9. ↑ 9.0 9.1 9.2 Freeman (1975), pp. 52-55.
  10. ↑ Freeman (1975), p. 51.
  11. ↑ "Trillium sessile var. chloropetalum Torr.". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew. https://www.ipni.org/n/258380-2. 
  12. ↑ Torrey, John (1856), Report on the botany of the expedition (Part V), Description of the general botanical collections (No. 4), Explorations and Surveys for a Railroad Route from the Mississippi River to the Pacific Ocean, IV: Route near the thirty-fifth parallel, explored by lieutenant A. W. Whipple, topographical engineers, in 1853 and 1854, Washington, D.C.: Department of War, p. 151, doi:10.5962/bhl.title.41563, OCLC 12125612, https://www.biodiversitylibrary.org/item/100867#page/184/mode/1up, retrieved 7 March 2022 
  13. ↑ "Trillium chloropetalum (Torr.) Howell". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew. https://www.ipni.org/n/542529-1. 
  14. ↑ Howell, Thomas (1903), A Flora of Northwest America, 1, Portland, Oregon, p. 661, https://www.biodiversitylibrary.org/page/53051449#page/671/mode/1up, retrieved 7 March 2022 
  15. ↑ Gledhill, David (2008). The Names of Plants (4th ed.). Cambridge University Press. ISBN 978-0-521-86645-3. https://books.google.com/books?id=NJ6PyhVuecwC. 
  16. ↑ Freeman (1975), pp. 48-55.
  17. ↑ Case Jr., Frederick W. (2002), "Trillium chloropetalum var. chloropetalum", in Flora of North America Editorial Committee, Flora of North America North of Mexico (FNA), 26, New York and Oxford, http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242102308, retrieved 7 March 2022 
  18. ↑ Case Jr., Frederick W. (2002), "Trillium chloropetalum var. giganteum", in Flora of North America Editorial Committee, Flora of North America North of Mexico (FNA), 26, New York and Oxford, http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242102309, retrieved 7 March 2022 
  19. ↑ Case & Case (1997), pp. 164-170.
  20. ↑ "Trillium chloropetalum", County-level distribution map from the North American Plant Atlas (NAPA) (Biota of North America Program (BONAP)), 2014, http://bonap.net/MapGallery/County/Trillium%20chloropetalum.png, retrieved 27 February 2022 
  21. ↑ "Trillium chloropetalum var. giganteum". Royal Horticultural Society. https://www.rhs.org.uk/Plants/120677/i-Trillium-chloropetalum-i-var-i-giganteum-i/Details. 
  22. ↑ "Ornamentals AGM Plants March 2020". Royal Horticultural Society. p. 112. https://www.rhs.org.uk/plants/pdfs/agm-lists/agm-ornamentals.pdf. 

External links

Wikidata ☰ Q3062172 entry



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