Grasses in California

Surface Brightness Measurements of Extended Galactic Nebulae

“…L1204/S140 is a classical, well studied edge-on photon-dominated region (PDR). It consists of the dark cloud L1204, D 910 pc (Crampton & Fisher 1974), which is bordered in the south-west by an HII region. This HII region is commonly thought to be excited by the B0 V star HD 211880 located well outside the cloud.…”

Bermudagrass

“…It can reproduce vegetatively, from both rhizomes and stolons, or by producing seeds. The extensive network of rhizomes and stolons makes bermudagrass partic ularly difficult to eradicate (4). It is introduced into new areas in many ways: the seeds are a common impurity in commercial seeds; plants bearing seeds are carried in hay, in packing, in bedding for live stock, and in feedstuffs; the seeds are carried by wind and irrigation water (21).…”

“…Bermudagrass is widely used in the southern states as a lawngrass (10). Some object to the grass as a lawn because it browns during the winter; never theless, bermudagrass is valued in many areas since ll wiH tolerate soils where other grasses would not ijlfive (4). It is also useful in reducing erosion: ijue stolons can grow over rocks 1.8 m across pr down steep embankments and effectively hold gifting sands (6).…”

Yellow Foxtail(Setaria lutescens)Biotype Studies: Growth and Morphological Characteristics

“…According to Odum (13) "Species with wide geographical ranges almost always develop locally adapted populations called ecotypes that have optima and limits of tolerances adjusted to local conditions". Yellow foxtail is widely distributed (15) and has been described as showing var iation between upright and prostrate growth forms (4,7,10,14). It therefore seems possible that a distinct prostrate agri cultural biotype may have been selected out of this population by the repeated mowing occurring in California irrigated alfal fa fields.…”

“…In recent years morphological and physiological variations within species of Setaria have been reported (14,17). Taxonomists have de scribed yellow foxtail as an upright growing plant (6,15) or that the species varies between an upright or a prostrate growth habit (4,7,10). Variation between upright and pros trate growth has been previously reported by Peters et al (14) who found biotypes of yellow foxtail in the northeastern states exhibiting differences in plant height, growth habit, numbers of tillers produced, and in date to maturity.…”