Weed
Pennsylvania smartweed
AcheneAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat.
Compressed obovateObovate:
Inverted egg shaped with apical end the broadest.
Black
Smooth or with slight roughness; shiny.
Remnants of floral parts present. Sides are flat or convex in center.
AchenesAchene:
A dry, hard, one-chambered, one-seeded indehiscent fruit, as in buckwheat (Fagopyrum) or sunflower (Helianthus). The fruit wall is not united with the seed coat. are two-sided and slightly convex on each side. Shape is orbicular except for the acute point at the apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
.
Not listed
Not included
Polygonaceae
Polygonum pensylvanicum L.
Persicaria bicornis (Raf.) Nieuwl.
Persicaria longistyla (Small) Small
Persicaria mississippiensis (Stanford) Small
Persicaria pensylvanica (L.) Small
Persicaria pensylvanica (L.) Small var. dura (Stanford) C.F. Reed
Polygonum bicorne Raf
Polygonum longistylum Small
Polygonum longistylum Small var. omissum (Greene) Stanford
Polygonum mexicanum auct. non Small
Polygonum mississippiense Stanford
Polygonum mississippiense Stanford var. interius
Polygonum pensylvanicum L. var. durum Stanford
Polygonum pensylvanicum L. var. eglandulosum J.C. Myers
Polygonum pensylvanicum L. var. genuinum Fernald
Polygonum pensylvanicum L. var. laevigatum Fernald
Polygonum pensylvanicum L. var. rosiflorum J.B.S. Norton
