Achnatherum hymenoides, Bouteloua gracilis, and Gutierrezia
sarothrae) within the near Sagebrush transect could also be contributing to this plot arrangement (Fig.
As Broom snakeweed Gutierrezia
sarothrae As Britt& Rusby Threadleaf snakeweed Gutierrezia
microcephala As (DC.
Within each plot, the presence/absence (frequency) of Coleogyne, Yucca, Encelia, and Gutierrezia
plants was recorded.
Although most studies have focused on interspecific facilitation, Parker (1982) observed strong intraspecific associations among seedlings of Gutierrezia
microcephala and conspecific adults.
Heritability of isotope discrimination in Gutierrezia
It is known in several western seacoast states of the USA on Gutierrezia
Wood [ray less B, J N 4122 gumweed] Gutierrezia
viridis in Kansas [Ellis, Gutierrezia
(n=26); Ellis, Solidago (n=23); Cimmaron, Gutierrezia
(n=8), Seward; Gutierrezia
(n=19); Marysville, Solidago (n=30)].
For instance, moderate levels of leaf herbivory retarded vegetative growth and flowering in the understory shrub Piper arieianum (Marquis 1988), and damaged individuals of Gutierrezia
sarothrae produced up to five times less seeds per branch relative to control plants (Wisdom et al.
2 + * Prosopis strombulifera * * * * Gutierrezia
gilliesii * * * * Gutierrezia
mandonii + * Distichlis spicata * * * * Baccharis aff.
sarothrae density was highest in both treatments at both soil surface and 3 cm depths (0.
The three most common dominant herbaceous species were Artemisia tridentata (big sagebrush), Gutierrezia
sarothrae (snakeweed), and Bromus tectorum (downy chess grass); and the three most common dominant overstory and understory species were Juniperus monosperma (one-seed juniper), d.
Heritability of carbon isotope discrimination in Gutierrezia
VI) containing scattered Acacia, Mimosa, Gutierrezia
, Ephedra, and Prosopis bushes of various sizes (Whitman & Orsak 1985).
The study site encompasses a number of habitats, ranging from open grassy areas to stands of widely spaced shrubs (primarily Acacia, Gutierrezia
, Ephedra, and Flourensia).