(Cynodon dactylon): Grass family; perennial; first leaves with somewhat
rough surface; ligule surrounded by ring of hairs with tuft of long hairs on
either side; auricles absent; stem flat, wiry, and without hairs.
(Convolvulus arvensis): Morningglory family; perennial; seed leaves nearly
square, with shallow notch at tip; early true leaves spade shaped; petioles flattened.
(Rumex crispus): Buckwheat family; perennial; seed leaves succulent and
3 times longer than wide; young seedlings vary in color, from entirely green
to red tinged in cooler months; petioles of young seedlings ribbed with bases
extending onto stem.
(Sorghum halepense): Grass family; perennial; first leaves with white
midvein, 8 times longer than wide and rolled in bud; ligule membranous below
and fringed or toothed above; no auricles.