Valladares and Pearcy (1998) working with sun and shade plants of Heteromeles
arbutifolia, a Californian chaparral shrub, reported that sun leaves have higher leaf mass per unit area than shade leaves.
Occasional individuals of Arbutus peninsularis, Prunus serotina subsp, virens and Heteromeles
The dominant genera of woody plant in this chaparral, such as Adenostoma, Ceanothus, Heteromeles
and Rhus, are not usually found in the other regions with a Mediterranean climate or they do not play such an important role.
1992), Asparagus scandens and Knowltownia vesicatoria in South Africa (Adamson and Salter 1950), and Heteromeles
arbutifolia and Rhus (Toxicodendron) diversiloba in California (Thomas 1961).
One of the island shrubs (Ceanothus) has significantly lower concentrations of the compounds than the mainland version, while the island Christmas berry (Heteromeles
) actually has more tannin for part of the year.
Pearcy, "Interactions between water stress, sun-shade acclimation, heat tolerance and photoinhibition in the sclerophyll Heteromeles
arbutifolia," Plant, Cell & Environment, vol.
Plant species composition for each site varied slightly, but all contained California lilac (Ceanothus griseus), coffeeberry (Rhamnus californica), California buckwheat (Eriogonum fasciculatum), toyon (Heteromeles
arbutifolia), elderberry (Sambucus mexicana) and coyote brush (Baccharis pilularis).
Understory species included toyon (Heteromeles
arbutifolia), hollyleaf redberry (Rhamnus crocea), bigberry manzanita (Arctostaphylos glauca), ceanothus (Ceanothus), and poison oak (Toxicodendron diversilobum; Vreeland and Tietje 1998).
Hall et al., 1975; Khairi & Hall, 1976a, 1976b; Sheriff, 1977; Johnson & Ferrell, 1983 Eremocitrus glaucax Khairi & Hall, 1976b Fraxinus americana Davies & Kozlowski, 1974 Hedera helix Aphalo & Jarvis, 1991 Heteromeles
arbutifolia Winner & Mooney, 1980 Picea engelmannii Johnson & Ferrell, 1983 Picea sitchensis Grace et al., 1975 Populus spp.
Otros componentes comunes son "ramon" (Cercocarpus spp.), "toyon" (Heteromeles
arbutifolia) y "yuca" (Yucca whipplei) (Rzedowski, 1978).