Factors affecting regulation of maternal investment in an indeterminate flowering plant (Cercidium microphyllum
understory species 0.49 -0.16 -0.36 % plant cover -0.30 0.36 0.59 % sand or silt 0.40 0.16 0.06 % small rock -0.60 -0.41 -0.17 % medium rock 0.12 0.49 -0.09 % large rock 0.15 -0.40 0.44 Major tree species (a) Major shrub species (b) Major understory species (c) Eigenvalue 1.79 1.32 1.12 % variance explained 22.36 16.51 14.06 (a) PADI, Pachycormus discolor; FOSP, Fouquieria spp.; BUMI, Bursera hindsiana; BUMI, Bursera microphylla; OLTE, Olneva tesota; CEMI, Cercidium microphyllum
; PAPR, Pachycereus pringlei.
T glandulosa Screwbean Prosopis pubescens T Mulberry, White Morus alba T Olive, European Olea europaea T Pagoda tree, Japanese Sophora japonica T Paloverde Blue Cercidium floridum T Little leaf Cercidium microphyllum
T Mexican Parkinsonia aculeata T Pine Aleppo Pinus halepensis T Digger Pinus sabiniana T Italian stone Pinus pinea T Japanese black Pinus thunbergii T Pinyon Pinus cembroides T Pistache, Chinese Pistacia chinensis T Poplar Balm-of-Gilead Populus balsamifera T Bolleana Populus alba var.
Seeds of another palo verde species, Cercidium microphyllum, are attacked by Stator limbatus and Mimosestes amicus in nearly the same way (Siemens et al., 1992).
Based on varying patterns of seed predation among species and the increase in pod biomass per seed with fewer seeds per pod, we expected frequencies of multiseeded pods to be much greater for Cercidium microphyllum and Olneya tesota compared to C floridum.
deltoidea, triangle-leaf bursage) and Encelia farinosa (brittlebush), with scattered Cercidium microphyllum (follows nomenclature of Hickman, 1993).
Cercidium microphyllum is known to be fire-sensitive with only some minor resprouting (Loftin, 1987; Cave, 1982; Cave and Patten, 1984).
The taller trees, such as paloverde (Cercidium microphyllum
) and ironwood (Olneya tesota), associated with arroyos in the Sonoran Desert that were studied by Hardy et al.
other common shrubs in the area included Larrea tridentata (creosotebush), Cercidium microphyllum
(yellow paloverde), Olneya tesota (ironwood), and Prosopis glandulosa (honey mesquite).
Vegetation was composed of the Arizona Upland subdivision of the Sonoran Deserstscrub community (Turner and Brown, 1994) and included palo verde (Cercidium microphyllum