Sunday, March 6, 2011

Weed list

Major weeds in the GOG are (with their current status):


Amaranthaceae, Amaranth Family
  • (Red-root pigweed, Amaranthus retroflexus, extremely abundant in beds last warm season, but not yet present in March)
Asteraceae, Sunflower Family
  • Bristly Ox-tongue, Picris echinoides, occasional seedlings in beds
  • Common groundsel, Senecio vulgaris, occasional in beds, extremely common in periphery, currently as seedlings and also adults flowering
  • Prickly Lettuce, Lactuca serriola, widespread in beds, closely resembling a lettuce seedling (actually left in place by weeding personnel in the lettuce beds), as of 13Mar11 seedlings with about 3 true leaves
  • (Yellow Starthistle, Centaurea solstitialis, a few plants were seen last year in the vicinity of bed E1, not yet seen as of March)
Brassicaceae, Mustard Family
  • Charlock, Sinapis arvensis, a large mass of full-flowering individuals to the east of the fire pit
  • Shepard's Purse, Capsella bursa-pastoris, only one plant seen on N end of beds, in flower and fruit
Caryophyllaceae, Pink Family
  • Chickweed, Stellaria media, seedlings scarce but adults plentiful and flowering and seeding, mostly peripherally
Convolvulaceae, Morning-Glory Family
  • Field bindweed, Convolvulus arvensis, both perennial shoots and seedlings widespread
Fabaceae, Pea Family
  • California burclover, Medicago polymorpha, (ID provisional) starting to germinate in several beds (as of 13Mar11)
Geraniaceae, Geranium Family
  • Storksbill, Erodium cicutarium, extremely abundant to the north of the bed area, currently not in flower
Lamiaceae, Mint Family
  • Henbit, Lamium amplexicaule, very few adults but seedlings dominate the seedling weeds, adults flowering
Malvaceae, Mallow Family
  • Cheeseweed, Malva parviflora, seedlings scarce but adults dominating the weed biomass
Oxaliadaceae, Wood Sorrel Family
  • Creeping woodsorrel, Oxalis corniculata, mostly newly germinated seedlings, esp in the GOG auxiliary
Polygonaceae, Buckwheat Family
  • Prostrate knotweed, Polygonum aviculare, mostly seedlings (UCIPM lists as P. arenastrum, which is now a synonym of P. aviculare subsp. depressum in Jepson Manual 2nd ed.)
Urticaceae, Nettle Family


Poaceae, Grass Family
  • Annual bluegrass, Poa annua, seedlings and adults widespread, adults reproductive
  • (Crabgrass, Digitaria sanguinalis, common on periphery in the bed AB9 area, seen last year)
  • Wild oat, Avena fatua (ID provisional), adults growing among the charlock

    1 comment:

    1. Impressive list. Terrific variety...must be the fertile soil.