Panamint dudleya
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. saxosa
Subspecies:
D. s. subsp. saxosa
Trinomial name
Dudleya saxosa subsp. saxosa
Synonyms
  • Cotyledon saxosum M.E.Jones

Dudleya saxosa subsp. saxosa is a species of succulent perennial plant endemic only to the western Panamint Range of California. It is known commonly as the Panamint liveforever or Panamint dudleya. It is found on north-facing, granitic or limestone slopes and grows up to 20 cm wide. It is characterized by bright yellow, red tinged flowers, which bloom from May to June.

Description

This species grows from basal rosettes which emerge from a caudex. The caudex is 1 to 1.5 cm in diameter. There are 1 to 4 rosettes per plant, which can be 6 to 20 cm wide. The leaves are 3 to 9 cm long, 3 to 15 mm wide, and 1.5 to 3 mm thick, with the base 5 to 15 mm wide.[1]

The inflorescence emerges from a peduncle 5 to 20 cm tall, and 2 to 4 mm wide. The lower internodes are generally greater than 5 mm apart. There are 3 first degree branches, with the terminal branches (cincinni) not wavy, the terminal branches 1 to 4 cm long, 2 to 9 flowered. The pedicels are 5 to 10 mm long. The flower has petals that are 9 to 12 mm long, colored bright yellow, and generally tinged with red.[1][2]

Taxonomy

This species was described as Cotyledon saxosum by Marcus E. Jones, based on a plant he found growing in Panamint Canyon in 1897.[3] In their revision of North American Crassulaceae, Nathaniel Lord Britton and Joseph Nelson Rose placed this species as Dudleya saxosa.[4] It was reduced to an autonym, Dudleya saxosa subsp. saxosa with Reid Moran's subsequent changes to the taxonomy of Dudleya.[5]

The plant is a well-isolated polyploid compared to the other subspecies of Dudleya saxosa, differing in its smaller size. It has a chromosome number of 2n = 136 and 2n = 170.[1][2]

Distribution and habitat

This species is found growing on north-facing, granitic or limestone cliffs and rocky slopes. It is found only in the western Panamint Mountains of California.[1][2]

References

  1. 1 2 3 4 McCabe, Stephen Ward (2012). "Dudleya saxosa subsp. saxosa". Jepson eFlora. Jepson Flora Project. Archived from the original on 2017-08-29. Retrieved 6 January 2022.
  2. 1 2 3 Moran, Reid. "Dudleya saxosa subsp. saxosa". Flora of North America. 8: 187.
  3. ↑ Jones, Marcus E. (1898). "Cotyledon saxosum n. sp". Contributions to Western Botany. 8.
  4. ↑ Rose, Joseph Nelson (1903). "New or noteworthy North American Crassulaceae". Bulletin of the New York Botanical Garden. 3 (9): 15.
  5. ↑ Moran, Reid (1957). "Innovations in Dudleya". Madroño. 14 (3): 108.
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