Malacothamnus palmeri

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Malacothamnus palmeri
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Malvales
Family: Malvaceae
Genus: Malacothamnus
Species:
M. palmeri
Binomial name
Malacothamnus palmeri
Synonyms

Malacothamnus palmeri is a species of flowering plant in the mallow family known by the common names Cambria bushmallow and Palmer's bushmallow. It is endemic to San Luis Obispo County, California, where it is known from the Santa Lucia Mountains. [1] [2]

Contents

Taxonomy

Malacothamnus palmeri was first described in 1877 as Malvastrum palmeri. In some treatments, Malacothamnus involucratus and Malacothamnus lucianus have been treated as varieties of or synonyms of Malacothamnus palmeri. In 2021 morphological analyses revealed these to be three morphologically and geographically distinct species. [3] [4] [5] [6] [1]

Identification

Malacothamnus palmeri is distinguished from the rest of the genus by the combination of a capitate to subcapitate inflorescence, glandular trichomes <=0.1 mm, and the adaxial (upper) surface of mature leaves having dense stellate trichomes. Malacothamnus palmeri is distinguished from Malacothamnus involucratus by having much denser stellate trichomes on the adaxial surface of mature leaves and by generally having the widest stipular bracts <=6.5 mm wide whereas Malacothamnus involucratus generally has sparse stellate trichomes on the adaxial surface of mature leaves and the widest stipular bracts are generally >=7mm wide. Malacothamnus palmeri is distinguished from Malacothamnus lucianus by having glandular trichomes <0.1 mm and most stellate trichome rays on the stem <1 mm whereas Malacothamnus lucianus has glandular trichomes 0.3-1.4 mm and many stellate trichome rays on the stem 1–3 mm. [1] [2]

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Malacothamnus lucianus is a species of flowering plant in the mallow family known by the common names Santa Lucia bushmallow and Arroyo Seco bushmallow and by the cultivar name Hanging Valley bushmallow. It is endemic to Monterey County, California, where it is known from the Santa Lucia Mountains.

Malacothamnus involucratus is a species of flowering plant in the mallow family known by the common name Carmel Valley bushmallow. It is likely endemic to Monterey County, California, where it is known from Carmel Valley and the Jolon region. A single specimen is attributed to San Luis Obispo County, California but the origin of this specimen is questionable.

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Malacothamnus mendocinensis is a species of flowering plant in the mallow family known by the common name Mendocino bushmallow. It is endemic to Mendocino County, California, where it is known from only two populations. It was presumed extinct until rediscovered in 2016 and now has a California Rare Plant Rank of 1B.1. In some treatments, Malacothamnus mendocinensis has been included within Malacothamnus fasciculatus or Malacothamnus hallii. Phylogenetic and morphological evidence, however, indicate that it is not closely related to these species and should be recognized as a separate species.

<i>Malacothamnus hallii</i> Species of flowering plant

Malacothamnus hallii is a species of flowering plant in the mallow family known by the common name Hall's bushmallow. It is endemic to southeastern counties of the San Francisco Bay Area, where it is a rare species. It has a California Rare Plant Rank of 1B.2. Malacothamnus hallii is occasionally treated within Malacothamnus fasciculatus.

Malacothamnus orbiculatus is a species of flowering plant in the mallow family known by the common names Tehachapi bushmallow and round-leaved bushmallow. It occurs in California, where it is common after burns on the desert-facing slopes of mountains, and Arizona, where it is currently only known from a few locations. Malacothamnus orbiculatus is occasionally treated within Malacothamnus fremontii.

Malacothamnus helleri is a species of flowering plant in the mallow family known by the common name Heller's bushmallow. It is endemic to Northern California, where it is a rare species. It has a California Rare Plant Rank of 3.3. Malacothamnus hellerii is occasionally treated within Malacothamnus fremontii.

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Malacothamnus astrotentaculatus is a species of flowering plant in the mallow family known by the common name starry-tentacled bushmallow. It is named after the somewhat tentacle-like outgrowths on the calyx that are covered in stellate trichomes. It is endemic to Shasta and Tehama counties in California.

Malacothamnus eastwoodiae is a species of flowering plant in the mallow family known by the common name Alice’s lovely bushmallow. It is named after the botanist Alice Eastwood. It is endemic to Santa Barbara County, California and currently only known from Vandenberg Space Force Base.

Malacothamnus discombobulatus is a species of flowering plant in the mallow family known by the common name discombobulating bushmallow. It is morphologically similar to Malacothamnus davidsonii and was treated within M. davidsonii in the past. Malacothamnus discombobulatus is named after the confusion sown from its morphological similarity to M. davidsonii. It is endemic to Monterey and San Luis Obispo counties in California.

References

  1. 1 2 3 Morse, K. 2021. A morphological assessment of the Malacothamnus palmeri complex (Malvaceae). Crossosoma 44: 1–27.
  2. 1 2 Morse, K. 2023. Malacothamnus Volume 3: A Revised Treatment of the Genus Malacothamnus (Malvaceae) Based on Morphological and Phylogenetic Evidence.
  3. Kearney, T. H. 1951. “The Genus Malacothamnus, Greene (Malvaceae).” Leaflets of Western Botany VI (6):113–40.
  4. Kearney, T. H. 1955. “Notes on Malvaceae VII: A New Variety in Malacothamnus.” Leaflets of Western Botany VII (12):289–90.
  5. Bates, D. M. 2015. “Malacothamnus.” In Flora of North America North of Mexico, edited by Flora of North America Editorial Committee, 6:280–85. New York and Oxford.
  6. Slotta, T. 2012. Malacothamnus. In B. Baldwin, D. Goldman, D. Keil, R. Patterson, T. J. Rosatti, and D. H. Wilken [eds.], The Jepson Manual: Vascular Plants of California, 884–885. University of California Press.