The following Participating Institutions are custodians for this species in the CPC National Collection:
Rancho Santa Ana Botanic Garden
The conservation of Dudleya cymosa ssp. ovatifolia is fully sponsored.
Dieter Wilken contributed to this Plant Profile.
Santa Monica Mountains Dudleya is a succulent perennial, with a basal rosette of 6-10 evergreen leaves, and a short stem bearing bright yellow flowers in late May (Bartel 1993; Nakai 1987; Thomson 1993). Although first described in 1903, it was not treated in identification manuals until the late 1950s (Munz 1959). Its narrow distribution is shared in part with two other rare Dudleya species (marcescent Dudleya, Veritys live-forever) that occur on sedimentary and volcanic rocks of the western Santa Monica Mountains in southern California. However, it apparently also occurs in a few isolated occurrences in the Santa Ana Mountains of Orange County. Variation in branching, leaf shape, and leaf color led Kei Nakai, a Dudleya specialist, to recognize subsp. agourensis (Agoura Hills Dudleya) as distinct from subsp. ovatifolia (Nakai 1987). The two subspecies occur in slightly different habitats, separated from each other by the main ridge of the Santa Monica Mountains. The Agoura Hills Dudleya generally occurs on relatively dry, exposed outcrops of volcanic breccia, whereas subsp. ovatifolia in the narrow sense occurs on shaded sites and conglomerate substrates. The two subspecies are listed separately by the California Department of Fish and Game. Both subspecies, however, are treated by the US Fish and Wildlife Service as a single entity for conservation purposes (US Fish and Wildlife Service 1999).
Distribution & Occurrence
Plants typically occur on rock outcrops and ledges with poor soil development.
|Fewer than 15 occurrences are known. Eight occurrences represent the Agoura Hills Dudleya; the other seven are occupied by the Santa Monica Mountains Dudleya. Most occurrences in the Santa Monica Mountains have fewer than 100 individuals each, although one population on private land was estimated to be composed of over 1,000 plants. At least 1,300 plants have been estimated at sites in the Santa Ana Mountains (Anonymous 2008a, b).|
Conservation, Ecology & Research
Development of a propagation protocol to be applied to in situ conditions
Anonymous. 2008a. Vascular plants, bryophytes, and lichens list. Sacramento. California Department of Fish and Game, Natural Diversity Database, Quarterly Publication. 70.
Munz, P.A. 1959. A California flora. Berkeley. University of California Press. 1681p.
Thomson, P.H. 1993. Dudleya and Hasseanthus handbook. Bonsall, California. Bonsall Publishers. 248p.
US Fish and Wildlife Service. 1999. Recovery plan for six plants from the mountains surrounding the Los Angeles Basin. Portland, Oregon. US Fish and Wildlife Service. 61.