UC IPM Online UC ANR home page UC IPM home page

UC IPM Home

SKIP navigation

 

Walnut

Identifying Summer Annual Weed Seedlings

On this page
  • Barnyardgrass
  • Bearded sprangletop
  • Common knotweed
  • Common purslane
  • Fall panicum (not shown)
  • Hairy fleabane
  • Horseweed
  • Large crabgrass
  • Puncturevine
  • Spotted spurge
  • Witchgrass

Names link to more information on identification and biology.

Click on photos to enlarge
Seedling of barnyardgrass, Echinochloa crus-galli.
Barnyardgrass
(Echinochloa crus-galli) Grass family; summer annual; first leaf dull gray-green; stem flattened, purplish; no ligule.
Bearded sprangletop seedling, Leptochloa fascicularis.
Bearded sprangletop
(Leptochloa fasicularis): Grass family; summer annual; first leaves light green, usually with white midrib; blades somewhat rolled; sheaths loose near base of plant; ligule long, thin, membranous and tears easily.
Seedling of California burclover
Common knotweed
(Polygonum arenastrum): Knotweed family; summer annual; seed leaves are long, very narrow, rounded at the tip and light green with a white cast; true leaves are much broader, emerging from an encircling, membranous sheath at the leaf base.
Seedling of common purslane, Portulaca oleracea.
Common purslane
(Portulaca oleracea): Purslane family; summer annual; seed leaves oblong, somewhat club shaped, succulent, maroon on lower surface, and green or maroon on upper surface; young leaves smooth, succulent, oblong, green on upper surface, maroonish underneath, and broadest around leaf tip, with short petioles.
Photo not available.
Fall panicum
(Panicum dichotomiflorum): Grass family; summer annual; the first leaf blade opens parallel to the ground, is lance shaped to linear, and about 5 times longer than wide; leaves are rolled in the shoot; ligule is a fringe of hairs, collars are very hairy, and auricles are absent; lower leaf blade surface is hairy, upper surface is without hair.
Seedling of  				hairy fleabane, Conyza bonariensis, at the four-leaf stage.
Hairy fleabane
(Conyza bonariensis): Sunflower family; summer annual; seed leaves gray-green; first leaves narrow and covered with short, soft hairs; often wrinkled or distorted.
Seedling of horseweed, Conyza canadensis, at the four-leaf stage.
Horseweed
(Conyza canadensis): Sunflower family; summer annual; seed leaves dull green, oval with fine hairs, and with short stalks that sometimes may be tinged brown-purple; first true leaves covered with hairs on upper surface and margins; undersides of early leaves smooth.
Crabgrass seedling.
Large crabgrass
(Digitaria sanguinalis): Grass family; summer annual; first leaf blade linear to lance shaped, with stiff, jagged, and papery ligule; hairs on margins of the collar wide; no auricles; leaves covered with coarse hairs; leaves rolled in bud.
Puncturevine seedling.
Puncturevine
(Tribulus terrestris): Caltrop family; summer annual; seed leaves thick, brittle, 2 to 3 times longer than wide; petioles pinkish; true leaves dark green with grayish underside and rough margins.
Spotted spurge seedling.
Spotted spurge
(Chamaesyce maculata): Spurge family; summer annual; seed leaves oval, tips roundish, blue-green with smooth margin; first true leaves rounded, leaf surface smooth and dull, dark green with reddish tinge.

Witchgrass
Witchgrass
(Panicum capillare): Grass family; summer annual; light green to red-purple and resembles crabgrass seedling but has slightly narrower leaf blades and longer silky hairs with swollen bases.

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/C881/m881spsummerann.html revised: January 8, 2014. Contact webmaster.