Dudleya palmeri

Vulnerable  (NatureServe)[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. palmeri
Binomial name
Dudleya palmeri
Synonyms
  • Cotyledon palmeri S. Wats.
  • Echeveria palmeri (S. Wats) Nelson & Macbride, 1913

Dudleya palmeri is a species of succulent plant in the family Crassulaceae known by the common name Palmer's liveforever. This Dudleya is endemic to California where it grows along the coast. It is characterized by orange to red over yellow or pink flowers. It is a polyploid species that closely resembles Dudleya lanceolata but has a coastal habit, and hybridizes with Dudleya caespitosa and Dudleya cymosa.

Description

Vegetative morphology

A plant in cultivation.

This species has a habit that may form solitary or caespitose plants of up to 8 rosettes, with each rosette 5 to 55 cm wide. The stem of older plants is typically shaded by desiccated leaves. The leaves are 5 to 20 cm long, and 1.5 to 5 cm wide, 3 to 8 mm thick, and shaped lance-oblong to lanceolate. The upper surface of the leaf is flat or transversely convex, and the leaves may or may not be covered in an epicuticular wax. When the leaves are removed from the plant, the remaining leaf bases will turn red with the wound. The tips are acute to acuminate, and the margins are often angled between the upper and lower leaf surfaces.[2][3]

Reproductive morphology

The inflorescence is borne on a peduncle 15 to 85 cm tall, and 4 to 11 mm wide. It branches around 3 times, and then consequently may rebranch up to 2 times. The terminal branches are 5 to 8 cm long, and have 5 to 14 flowers. The flowers are suspended on erect pedicels 2 to 10 mm long. The flowers have sepals 3 to 5 mm long, shaped deltate to ovate, with an acute tip. The petals are 11 to 16 mm long, 3 to 5 mm wide, shaped elliptic, and colored a red over yellow, bright yellow marked with red, and orange, with the tips of the petals erect and acute.[2][3]

Another example of the inflorescence.

The chromosome number is varied, 2n = 136, 170, 238. Flowering is late spring, typically from May to July[2][3]

Taxonomy

Taxonomic history

The first collection of this plant was made in San Simeon Bay by a Dr. E Palmer in 1877, whom the specific epithet is named after, and described by Sereno Watson in 1879 as Cotyledon palmeri. The type specimen also regards the petal color as "pale lemon-yellow,[4]" rather than the currently accepted definition of D. palmeri encompassing red and orange petaled plants.[2]

Classification

This plant is only more or less distinct from Dudleya lanceolata and Dudleya caespitosa.[2][5] Some botanists regard the Dudleya caespitosa plants in Monterey County with red-petaled flowers to be closer to this species.[5] It is within a species complex that includes Dudleya farinosa, Dudleya caespitosa, Dudleya greenei, and Dudleya candelabrum.[5][3]

Distribution and habitat

This species occurs from the Santa Lucia Mountains in Monterey County along the coast south to the Santa Monica Mountains in Los Angeles County. It is found on the rocky slopes and cliffs near the coast, from a height of 0 to 100 meters.[3]

References

  1. ↑ "Dudleya palmeri". NatureServe Explorer. NatureServe. 2021. Retrieved 17 December 2021.
  2. 1 2 3 4 5 McCabe, Stephen Ward (2012). "Dudleya palmeri". Jepson eFlora. Jepson Flora Project (eds.). Archived from the original on 2017-08-29. Retrieved 17 December 2021.
  3. 1 2 3 4 5 Moran, Reid. "Dudleya palmeri". Flora of North America. 8: 190.
  4. ↑ Watson, Sereno (1879). "Cotyledon palmeri". Proceedings of the American Academy of Arts and Sciences. 14: 292.
  5. 1 2 3 McCabe, S. (1997). Dudleya gnoma (Crassulaceae): A new species from Santa Rosa Island. Madroño 44 48-58.
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