(Convolvulus arvensis): Morningglory family; perennial, with most new
shoots and seedlings emerging in spring; seed leaves nearly square, with shallow
notch at tip; early true leaves spade shaped; petioles flattened.
(Cyperus spp.): Sedge family; perennial; first leaves inconspicuous and
grasslike; grow mainly from tubers or "nutlets"
formed on rhizomes, mostly in upper foot of soil; in cross
section, leaves V-shaped, arranged in sets of three at base,
and stems triangular.
(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.